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    <title language="eng">Ultrasonic assisted milling of a CoCrFeNi medium entropy alloy</title>
    <abstract language="eng">Medium and High Entropy Alloys (MEA/HEA) are recently developed material classes, providing manifold applications, e.g., due to extraordinary structural properties. In that connection, the machinability as important issue for the processing of these materials was not in the scientific focus. This study focusses on experimental analysis of milling process conditions including ultrasonic assisted milling (USAM) and their effects on the resulting surface integrity of equiatomic CoCrFeNi-MEA specimens. For that reason, milling parameters (cutting speed, feed per cutting edge) were systematically varied for both conventional milling and USAM. The surface integrity was analyzed in terms of topography, defects, and residual stresses. Especially USAM leads to a decrease of occurring cutting forces and, hence, to an improvement of the surface integrity. Beneficial effects were observed in terms of lower tensile residual stresses at high cutting speed and feed per cutting edge.</abstract>
    <parentTitle language="eng">Procedia CIRP</parentTitle>
    <identifier type="doi">10.1016/j.procir.2022.05.203</identifier>
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    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Tim Richter</author>
    <author>Diego Delgado Arroyo</author>
    <author>Andreas Börner</author>
    <author>Dirk Schröpfer</author>
    <author>Michael Rhode</author>
    <author>T. Lindner</author>
    <author>M. Löbel</author>
    <author>B. Preuß</author>
    <author>T. Lampke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Medium entropy alloy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic Assisted Machining</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Surface Integrity</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
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    <collection role="institutes" number="">9.0 Abteilungsleitung und andere</collection>
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    <file>https://opus4.kobv.de/opus4-bam/files/55445/PROCEDIA CIRP_Ultrasonic assisted milling of a CoCrFeNi medium entropy alloy.pdf</file>
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  <doc>
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    <publishedYear>2021</publishedYear>
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    <issue/>
    <volume>882</volume>
    <type>corrigendum</type>
    <publisherName>IOP Publishing</publisherName>
    <publisherPlace>Bristol</publisherPlace>
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    <title language="eng">Corrigendum: Hydrogen diffusion and local Volta potential in high- and medium-entropy alloys (2020 IOP Conf. Ser.: Mater. Sci. Eng. 882 012015)</title>
    <abstract language="eng">In the sub-section “2.1 Investigated materials” the  chemical composition of Co, Cr and Mn was in wrong order for both HEA and MEA. The content of table 1 is here included in the correct version.</abstract>
    <parentTitle language="eng">IOP Conference Series: Materials Science and Engineering</parentTitle>
    <identifier type="doi">10.1088/1757-899X/882/1/012027</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-527050</identifier>
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    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Michael Rhode</author>
    <author>Annica Wetzel</author>
    <author>Ozlem Oczan</author>
    <author>Jonathan Nietzke</author>
    <author>Tim Richter</author>
    <author>Dirk Schröpfer</author>
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  <doc>
    <id>59577</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>11</pageLast>
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    <title language="eng">Local mechanical properties of dissimilar metal TIG welded joints of CoCrFeMnNi high entropy alloy and AISI 304 austenitic steel</title>
    <abstract language="eng">Multiple principal element alloys encompass the well-known high entropy alloys (HEA). The alloy system represents a new class of materials consisting of at least three alloying elements, each containing 5 to 35 at.%. Thus, this alloying concept differs fundamentally from conventional materials such as steel or nickel alloys. For this purpose, the alloying elements are specifically selected, the microstructures are adjusted in a single-phase and, in some cases, multi-phase manner. In particular, conflicting goals, such as the trade-off between strength and ductility in conventional steels, are overcome. However, in the last 20 years, the focus has been on material synthesis. With the increase in available material quantities, the focus is now on processing issues such as joining and welding processes. The weldability of HEAs has received very little attention so far. The experience with dissimilar metal welds is completely lacking but is essential for the application of these materials in combination with conventional materials. The present study presents comprehensive experimental results on the weldability of an equimolar CoCrFeMnNi-HEA in cold-rolled and heat-treated condition, which was joined by tungsten inert gas welding to an austenitic steel AISI 304. The mechanical properties of the dissimilar metal welds were characterized by cross-weld tensile samples, whereas the local deformation in the weld of the different welding zones was measured by digital image correlation. In accordance with the respective initial HEA condition (cold-rolled vs. heat-treated), the local strain behavior was divergent and influenced the global mechanical properties of both DMW types. Nonetheless, the experiments provided proof in principle of the weldability for dissimilar joints of the CoCrFeMnNi-HEA welded to conventional materials like austenitic stainless steels ensuring a corresponding capability for mechanical loading. This allows further considerations on the application of these innovative materials.</abstract>
    <parentTitle language="eng">Welding in the World</parentTitle>
    <identifier type="doi">10.1007/s40194-024-01718-4</identifier>
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IOP Conf Ser: Mater Sci Eng 882:012015. https:\/\/doi.org\/10.1088\/1757-899X\/882\/1\/012015Richter","journal-title":"IOP Conf Ser: Mater Sci Eng"},{"key":"1718_CR41","doi-asserted-by":"publisher","first-page":"131","DOI":"10.1016\/j.corsci.2018.02.031","volume":"134","author":"H Luo","year":"2018","unstructured":"Luo H, Li ZM, Mingers AM et al (2018) Corrosion behavior of an equiatomic CoCrFeMnNi high-entropy alloy compared with 304 stainless steel in sulfuric acid solution. 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    <enrichment key="local_crossrefDocumentType">journal-article</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">18.03.2024</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Michael Rhode</author>
    <author>Kjell Erxleben</author>
    <author>Tim Richter</author>
    <author>Dirk Schröpfer</author>
    <author>Tobias Mente</author>
    <author>Thomas Michael</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>TIG welding</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High-entropy alloys</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mechanical properties</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Dissimilar metal weld</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
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    <collection role="themenfelder" number="">Materialdesign</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
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  </doc>
  <doc>
    <id>54169</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>13</pageLast>
    <pageNumber/>
    <edition/>
    <issue>5</issue>
    <volume>6</volume>
    <type>article</type>
    <publisherName>MDPI</publisherName>
    <publisherPlace>Basel (CH)</publisherPlace>
    <creatingCorporation/>
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    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Influence of Surface Preparation on Cracking Phenomena in TIG-Welded High and Medium Entropy Alloys</title>
    <abstract language="eng">Multi-element systems with defined entropy (HEA—high entropy alloy or MEA—medium entropy alloy) are rather new material concepts that are becoming increasingly important in materials research and development. Some HEA systems show significantly improved properties or combinations of properties, e.g., the overcoming of the trade-off between high strength and ductility. Thus, the synthesis, the resulting microstructures, and properties of HEA have been primarily investigated so far. In addition, processing is crucial to achieve a transfer of potential HEA/MEA materials to real applications, e.g., highly stressed components. Since fusion welding is the most important joining process for metals, it is of vital importance to investigate the weldability of these materials. However, this has rarely been the subject of research to date. For that reason, in this work, the weldability depending on the surface preparation of a CoCrFeMnNi HEA and a CoCrNi MEA for TIG welding is investigated. The fusion welding of longer plates is described here for the first time for the CoCrNi alloy. The welds of both materials showed distinct formation of cracks in the heat affected Zone (HAZ). Optical and scanning electron microscopy analysis clearly confirmed an intergranular fracture topography. However, based on the results, the crack mechanism cannot be conclusively identified as either a liquid metal embrittlement (LME) or hot cracking-like liquid film separation.</abstract>
    <parentTitle language="eng">Journal of Manufacturing and Materials Processing</parentTitle>
    <identifier type="issn">2504-4494</identifier>
    <identifier type="doi">10.3390/jmmp6010005</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-541697</identifier>
    <enrichment key="eventName">2nd International Conference on Advanced Joining Processes</enrichment>
    <enrichment key="eventPlace">Sintra, Portugal</enrichment>
    <enrichment key="eventStart">21.10.2021</enrichment>
    <enrichment key="eventEnd">22.10.2021</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">04.04.2022</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Tim Richter</author>
    <author>Marcel Giese</author>
    <author>Michael Rhode</author>
    <author>Dirk Schröpfer</author>
    <author>Thomas Michael</author>
    <author>Tobias Fritsch</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>TIG welding</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cracking</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High entropy alloy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Medium entropy alloy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Surface preparation</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.5 Röntgenbildgebung</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
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    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
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    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
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    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/54169/jmmp-06-00005-v2_Authors_copy.pdf</file>
  </doc>
  <doc>
    <id>57299</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>18</pageLast>
    <pageNumber/>
    <edition/>
    <issue>3</issue>
    <volume>13</volume>
    <type>article</type>
    <publisherName>MDPI (Multidisciplinary Digital Publishing Institute)</publisherName>
    <publisherPlace>Basel (CH)</publisherPlace>
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    <contributingCorporation/>
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    <completedDate>--</completedDate>
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    <title language="eng">Influence of Milling Conditions on AlxCoCrFeNiMoy Multi-Principal-Element Alloys</title>
    <abstract language="eng">Multi-Principal-Element or High-Entropy Alloys (MPEAs/HEAs) have gained increasing interest in the past two decades largely due to their outstanding properties such as superior mechanical strength and corrosion resistance. However, research studies on their processability are still scarce. This work assesses the effect of different machining conditions on the machinability of these novel alloys, with the objective of advancing the introduction of MPEA systems into industrial applications. The present study focuses on the experimental analysis of finish-milling conditions and their effects on the milling process and resulting surface finish of CoCrFeNi, Al0.3CoCrFeNi and Al0.3CoCrFeNiMo0.2 alloys fabricated via Spark Plasma Sintering. Ball-nose-end milling experiments have been carried out various milling parameters such as cutting speed, feed per cutting edge, and ultrasonic assistance. In situ measurements of cutting forces and temperature on the tool edge were performed during the experiments, and surface finish and tool wear were analyzed afterwards. The results exhibited decreasing cutting forces by means of low feed per cutting edge and reduced process temperatures at low cutting speed, with the use of ultrasonic-assisted milling. It was shown that the machinability of these modern alloys through conventional, as well as modern machining methods such as ultrasonic-assisted milling, is viable, and common theories in machining can be transferred to these novel MPEAs.</abstract>
    <parentTitle language="eng">Coatings</parentTitle>
    <identifier type="doi">10.3390/coatings13030662</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-572990</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">17.04.2023</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Diego Delgado Arroyo</author>
    <author>Tim Richter</author>
    <author>Dirk Schröpfer</author>
    <author>Andreas Boerner</author>
    <author>Michael Rhode</author>
    <author>T. Lindner</author>
    <author>B. Preuß</author>
    <author>T. Lampke</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Multi-principal element alloys</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Finish milling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Spark plasma sintering</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic-assisted milling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microstructure characterization</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
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    <collection role="themenfelder" number="">Materialdesign</collection>
    <collection role="themenfelder" number="">Additive Fertigung</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/57299/MDPI_Coatings_Milling_AlCoCrFeNiMo_mit_TU_Chemnitz.pdf</file>
  </doc>
  <doc>
    <id>57298</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>14</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>35</volume>
    <type>article</type>
    <publisherName>Elsevier Ltd.</publisherName>
    <publisherPlace>Amsterdam (NL)</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Microstructure and texture characterisation of friction stir welded CoCrNi and CoCrFeMnNi multi-principle element alloys</title>
    <abstract language="eng">This work investigates the microstructure formed in friction stir welds of FCC alloys, focused on two multiprincipal alloys: a CoCrFeMnNi high-entropy alloy (HEA) and a CoCrNi medium-entropy alloy (MEA). A commercial stainless steel AISI 304 is used for comparison. The largest nugget was formed in the MEA, while the smallest was formed in the HEA. Grain refinement occurs in the stirred zone in all welds. Discontinuous dynamic recrystallisation is the predominant restoration mechanism during friction stir welding of the three investigated alloys. A sharp decrement in the Σ3 boundary fraction occurs in the stirred zone of the AISI 304 and HEA welds, while comparable values with the base metal are found for the MEA weld. The peak in the maximum index of crystallographic texture is observed on the advancing side of the stirred zone of the AISI 304 weld. A strong &lt;001&gt; θ-fibre texture is formed in the advancing side of the nugget in the AISI 304 from a well-established {123} &lt;634&gt; S-type texture in the base metal. Multiple crystallographic texture components without specific fibres are identified in most regions of the welds, indicating the complex shear path history during friction stir welding.</abstract>
    <parentTitle language="eng">Materials Today Communications</parentTitle>
    <identifier type="doi">10.1016/j.mtcomm.2023.105870</identifier>
    <identifier type="urn">urn:nbn:de:kobv:b43-572987</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="date_peer_review">05.06.2023</enrichment>
    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>R.H. Buzolin</author>
    <author>Tim Richter</author>
    <author>F. Pixner</author>
    <author>Michael Rhode</author>
    <author>Dirk Schröpfer</author>
    <author>N. Enzinger</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Microstructure</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Multiple principal element alloy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Friction stir welding</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Electron backscattered diffraction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Crystallographic texture</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
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    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/57298/Buzolin_Richter_Microstructure_MPEA_FSW.pdf</file>
  </doc>
  <doc>
    <id>53607</id>
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    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
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    <type>lecture</type>
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    <completedDate>--</completedDate>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Characterization of cracking phenomena in TIG welds of high and medium entropy alloy</title>
    <abstract language="eng">Multi-element systems with defined entropy (HEA - High Entropy Alloy or MEA - Medium Entropy Alloy) are rather new material concepts that are becoming increasingly important in materials research and development. Some HEA systems show significantly improved properties or combinations of properties, e.g., the overcome of the trade-off between high strength and ductility. Thus, the synthesis, the resulting microstructures, and properties of HEA have been primarily investigated so far. In addition, processing is crucial to achieve a transfer of potential HEA/MEA materials to real applications, e.g. highly stressed components. Since fusion welding is the most important joining process for metals, it is of vital importance to investigate the weldability of these materials. However, this has rarely been the subject of research up to date. For that reason, in this work the weldability depending on the surface preparation of a CoCrFeMnNi-HEA and a CoCrNi-MEA for TIG welding is investigated. The fusion welding of longer plates is described here for the first time for the CoCrNi alloy. The welds of both materials showed distinct formation of cracks in the heat affected zone (HAZ). Optical and scanning electron microscopy analysis clearly confirmed an intergranular fracture topography. But based on the results, the crack mechanism cannot be conclusively clarified as either a liquid metal embrittlement (LME) or hot cracking like liquid film separation occurred.</abstract>
    <enrichment key="eventName">2nd International Conference on Advanced Joining Processes</enrichment>
    <enrichment key="eventPlace">Online meeting</enrichment>
    <enrichment key="eventStart">21.10.2021</enrichment>
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    <author>Tim Richter</author>
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    <title language="eng">Microstructure characterization of dissimilar metal welds of innovative high- and medium-entropy alloys to austenitic stainless steels joint by tungsten inert gas and friction stir welding</title>
    <abstract language="eng">The new multi-element alloying concept of systems with defined entropy (HEA — high-entropy alloy or MEA — medium-entropy alloy) is increasing in material research interest. Improved properties or combinations of properties are shown by several systems. Thus, the resulting microstructures and production of HEA/MEA as well as properties have been primarily investigated so far. Furthermore, processing is a key issue to transfer HEA/MEA systems to real components. Since welding is the most important joining process for metals, it is crucial to investigate the influence of welding to guarantee component integrity. Since most HEA are made of expensive alloying elements such as Co or Ni, they will not be used entirely as structural materials. Thus, it can be advantageous to weld conventional alloys such as austenitic stainless steels with the HEA and MEA to produce components that are both application-oriented and economically viable. Therefore, in this paper, first results of dissimilar metal welding, by tungsten inert gas (TIG) and friction stir welding (FSW), of a CoCrFeMnNi HEA as well as a CoCrNi MEA with a conventional AISI 304 austenitic stainless steel are presented. The focus is on the microstructure formation due to the two welding processes. The results of TIG welding show a dendritic microstructure, whereas in FSW both materials are stirred but still coexist.</abstract>
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    <author>Tim Richter</author>
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    <title language="eng">Welding of high-entropy alloys and compositionally complex alloys - an overview</title>
    <abstract language="eng">High-entropy alloys (HEAs) and compositionally complex alloys (CCAs) represent new classes of materials containing five or more alloying elements (concentration of each element ranging from 5 to 35 at. %). In the present study, HEAs are defined as single-phase solid solutions; CCAs contain at least two phases. The alloy concept of HEAs/CCAs is fundamentally different from most conventional alloys and promises interesting properties for industrial applications (e.g., to overcome the strength-ductility trade-off). To date, little attention has been paid to the weldability of HEAs/CCAs encompassing effects on the welding metallurgy. It remains open whether welding of HEAs/CCAs may lead to the formation of brittle intermetallics and promote elemental segregation at crystalline defects. The effect on the weld joint properties (strength, corrosion resistance) must be investigated. The weld metal and heat-affected zone in conventional alloys are characterized by non-equilibrium microstructural evolutions that most probably occur in HEAs/CCAs. The corresponding weldability has not yet been studied in detail in the literature, and the existing information is not documented in a comprehensive way. Therefore, this study summarizes the most important results on the welding of HEAs/CCAs and their weld joint properties, classified by HEA/CCA type (focused on CoCrFeMnNi and AlxCoCrCuyFeNi system) and welding process.</abstract>
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    <author>Michael Rhode</author>
    <author>Tim Richter</author>
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    <author>Anna Maria Manzoni</author>
    <author>M. Schneider</author>
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      <value>High-entropy alloy</value>
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      <value>Properties</value>
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    <title language="deu">Charakterisierung der WIG und FSW-Mischverbindungen neuartiger Multielement-Legierungen mit einem austenitischen Stahl</title>
    <abstract language="deu">Multielement-Legierungen (MPEA - Multiple Principal Element Alloys), gemeinhin und partiell fälschlicherweise auch als Hochentropielegierungen bezeichnet) stellen eine neue Klasse von Werkstoffen dar, die aus mindestens drei Legierungselementen mit jeweils 5 bis 35 Atom-% bestehen. Somit unterscheidet sich dieses Legierungskonzept fundamental von konventionellen Werkstoffen wie Stahl oder Nickellegierungen. Hierzu werden die Legierungselemente gezielt ausgewählt und die Mikrostrukturen ein- und zum Teil auch mehrphasig eingestellt. Das Ziel ist dabei, hochinnovative MPEA mit individuell einstellbaren Eigenschaften für die industrielle Anwendung zu identifizieren. Dabei werden insbesondere Zielkonflikte, wie bspw. der Trade-off zwischen Festigkeit und Duktilität bei konventionellen Stählen, überwunden. Insbesondere die hohe mechanische Festigkeit bei höchster Korrosionsbeständigkeit sind bei bestimmten Legierungssystemen von hohem Interesse. Hier kann u.a. die Substitution klassischer hochlegierter Stähle oder Ni-Basislegierungen perspektivisch erfolgen. In den letzten 20 Jahren lag der Fokus jedoch auf der reinen Materialsynthese. Mit der Zunahme verfügbarer Werkstoffquantitäten, stehen Verarbeitungsfragen, wie werkstoff- und beanspruchungsgerechte Füge- bzw. Schweißverfahren jetzt im Mittelpunkt. Der Schweißeignung von MPEA wurde bisher nur äußert wenig Aufmerksamkeit zuteil. Erfahrungen zu Mischverbindungen&#13;
(DMWs - Dissimilar Metal Welds) fehlen dabei vollständig, sind jedoch essenziell für die Anwendung dieser Werkstoffe in Verbindung mit konventionellen Werkstoffen. Die vorliegende Studie präsentiert erstmals im deutschen Sprachraum, die umfassenden experimentellen Ergebnisse zur Schweißeignung von MPEA-Mischverbindungen und der resultierenden Mikrostruktur. Dazu wurden zwei äquiatomare MPEAs in Form einer Co20Cr20Fe20Mn20Ni20 (Hochentropie-) und Co33.3Cr33.3Ni33.3 (Mediumentropielegierung) mittels WIG und Rührreibschweißen mit einem konventionellen, korrosionsbeständigem Cr-Ni-Stahl AISI 304 (1.4301 bzw. X5CrNi18-10) gefügt. Die erstmals untersuchten DMWs resultierten dabei in sehr interessanten Mikrostrukturen, mechanisch-technologische Eigenschaften wurden durch instrumentierte Zugversuche gewonnen, die gleichzeitig der Ermittlung der lokalen Verformung im Schweißnahtbereich dienten (durch Verwendung der berührungslosen DIC-Digital Image Correlation-Technik). Dabei zeigt sich für beide Schweißverfahren eine Erweichung in der Wärmeeinflusszone (WEZ) der MPEAs sowie eine geringfügig verminderte Zugfestigkeit, bei einer deutlichen Abnahme der Bruchdehnung. Durch die Experimente konnte der prinzipielle Nachweis der Schweißeignung der MPEAs für DMWs mit konventionellen Werkstoffen erbracht werden, die auch eine dementsprechende mechanische Beanspruchbarkeit ermöglichen. Dies ermöglicht weitere Betrachtungen zur Anwendung dieser innovativen Werkstoffe.</abstract>
    <parentTitle language="deu">DVS Berichte 389: DVS CONGRESS 2023 Große Schweißtechnische Tagung DVS CAMPUS</parentTitle>
    <identifier type="isbn">978-3-96144-230-0</identifier>
    <enrichment key="eventName">DVS Congress 2023</enrichment>
    <enrichment key="eventPlace">Essen, Germany</enrichment>
    <enrichment key="eventStart">11.09.2023</enrichment>
    <enrichment key="eventEnd">14.09.2023</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Michael Rhode</author>
    <author>Kjell Erxleben</author>
    <author>Tim Richter</author>
    <author>Dirk Schröpfer</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Schweißeignung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Mischverbindung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Hochentropielegierung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Multielement-Legierung</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>FSW</value>
    </subject>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>WIG</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
    <collection role="institutes" number="">9.2 Versuchsanlagen und Prüftechnik</collection>
    <collection role="institutes" number="">9.4 Integrität von Schweißverbindungen</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="institutes" number="">9.0 Abteilungsleitung und andere</collection>
  </doc>
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