TY - GEN A1 - Becker, Joachim A1 - Bogon, Peter A1 - Gers, Horst A1 - Kiefer, Armin A1 - Leyens, Christoph A1 - Newiak, Fridjof A1 - Roll, Karl A1 - Straube, Oliver A1 - Viehweger, Bernd T1 - Magnesium-Knetlegierungen für den Automobilbau N2 - Wenngleich der Verwendung von Mg-Knetlegierungen im Automobilbau ein großes Potenzial zugesprochen wird, ist deren Einsatz bislang von geringer Bedeutung geblieben. Im Rahmen des vom BMBF-geförderten Verbundforschungsvorhabens "MIA-Magnesium im Automobilbau" werden daher in Zusammenarbeit der Firmen DaimlerChrysler AG, ThyssenKrupp Umformtechnik GmbH, Otto Fuchs KG, Honsel GmbH & Co. KG, GP Innovation GmbH, OSK Kiefer GmbH sowie der BTU in Cottbus die Grundlagen für die prototypische Fertigung von Bauteilen aus den Mg-Knetlegierungen des Typf AZ 31 und AZ 80 erarbeitet. KW - Magnesium-Knetlegierungen Y1 - 2005 U6 - https://doi.org/10.1007/BF03221747 N1 - www.all4engineers.com ER - TY - CHAP A1 - Zhang, J. A1 - Kutzsche, Anja A1 - Rosenberg, K. A1 - Viehweger, Bernd A1 - Leyens, Christoph T1 - A novel canning technology for forging of gamma-TiAl alloys N2 - A novel canning technology to forge gamma-TiAl alloys was developed at the BTU Cottbus. A TiAl specimen is encapsulated with multilayer stainless steel foil and glass. The steel foil layers prevent the heat loss through radiation and the glass layer reduces the temperature decrease through conduction. First, the effect of steel foil on the cooling rate was investigated. Cooling curves were recorded for TiAl specimens without steel foil layer, with 1, 2, 3 and 4 layers of steel foil, as well as with 3 coated steel foil layers, respectively. While the unprotected specimen cooled from 1200 °C to 1100 °C within 12 s, the specimen with 3 coated steel foil layers needed 52 s for the same temperature decrease. The efficiency of the glass layer was examined with forging of steel specimens. The cooling rate during forging of the specimen with a glass layer is only half of that without a glass layer. Based on the results, Ti-45Al-0.5Mo-0.5Cu-0.2Si specimens, canned with steel foil and glass, were successfully forged at strain rates of 0.1 s-1 and 0.04 s-1 with warm dies which were heated to 500 °C. Visual and metallographic examinations revealed no cracks, pores or micropores. The microstructures are fine-equiaxed grains. KW - canned forging KW - canning KW - TiAl Y1 - 2006 ER - TY - CHAP A1 - Kutzsche, Anja A1 - Zhang, J. A1 - Appel, Fritz A1 - Leyens, Christoph A1 - Viehweger, Bernd T1 - Forging of Beta-Phase containing gamma-TiAl alloys KW - TiAl Y1 - 2006 ER - TY - GEN A1 - Zhang, Ping A1 - Flores Renteria, Arturo A1 - Wild, E. A1 - Reimers, W. A1 - Leyens, Christoph T1 - Oxidation-resistant Ti-90Al coatings with lotus effect surfacemorphology deposited on a gamma-TiAl alloy T2 - Scripta Materialia N2 - Ti-90Al (in at.%) coatings were deposited on Ti-45Al-8Nb alloy at two different temperatures, 300 and 540 °C. The coatingsputtered at 300 °C consisted of Al and TiAl3 with columnar grain structure. The morphology, chemical composition and microstructureof the coating sputtered at540 °Cwere strongly dependent on the substrate microstructure. The two coating variantsformed oxidation-resistant Al2O3 scales during oxidation. The special morphological features of the coatings make them interestingfor geometrically structuring the surfaces to provoke the lotus effect. KW - Ti-Al coating KW - Sputtering KW - gamma-TiAl alloy KW - Oxidation-resistant coating KW - Lotus effect Y1 - 2009 SN - 1359-6462 VL - 61 IS - 12 SP - 1156 EP - 1159 ER - TY - GEN A1 - Zhang, Ping A1 - Ding, W. J. A1 - Lindemann, Janny A1 - Leyens, Christoph T1 - Mechanical properties of the hot-rolled Mg-12Gd-3Y magnesium alloy N2 - Tensile and high cycle fatigue (HCF) properties of the hot-rolled Mg-12Gd-3Y (wt.%) magnesium alloyhave been investigated. The magnesium alloy exhibits a fatigue strength of about 150 MPa, which ismuch higher than that of the commercial Mg-8Al-Zn alloy AZ80. Aging heat-treatment (T5) improvedthe fatigue life of the Mg-12Gd-3Y alloy. Fatigue cracks nucleated at the intense slip bands in theas-rolled alloy. After T5 treatment, however, the fatigue crack nucleation site shifted to the phase boundariesbetween MgGdY particles and Mg matrix. T5 heat-treatment retarded the crack initiation and thusimproved the fatigue life of the Mg-12Gd-3Y alloy. KW - Mechanical properties KW - Tensile KW - Fatigue KW - Magnesium alloys KW - Aging heat treatment Y1 - 2009 ER - TY - CHAP A1 - Lindemann, Janny A1 - Glavatskikh, Maria A1 - Leyens, Christoph A1 - Roth-Fagaraseanu, Dan ED - Kim, Young-Won T1 - Effect of Small Boron and Carbon Additions on the Mechanical Properties of a Novel High Niobium-Containing Gamma Titanium Aluminide Alloy T2 - Structural aluminides for elevated temperatures, proceedings of the Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 annual meeting & exhibition, New Orleans, Louisiana, USA, March 9 - 13, 2008 KW - Gamma titanium aluminides KW - Mechanical properties KW - Fatigue KW - Creep Y1 - 2008 SN - 978-0-87339-720-9 SP - 257 EP - 264 PB - TMS CY - Warrendale, Pa. ER - TY - CHAP A1 - Glavatskikh, Maria A1 - Lindemann, Janny A1 - Leyens, Christoph A1 - Oehring, Michael A1 - Appel, Fritz ED - Kim, Young-Won T1 - Surface Strengthening for Enhanced Fatigue Performance of Gamma Titanium Aluminides T2 - Structural aluminides for elevated temperatures, proceedings of the Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 annual meeting & exhibition, New Orleans, Louisiana, USA, March 9 - 13, 2008 KW - Gamma titanium aluminides KW - Shot peening KW - Roller burnishing KW - High cycle fatigue Y1 - 2008 SN - 978-0-87339-720-9 SP - 111 EP - 118 PB - TMS CY - Warrendale, Pa. ER - TY - GEN A1 - Garkas, Wagdi A1 - Leyens, Christoph A1 - Flores Renteria, Arturo T1 - Synthesis and characterization of Ti2AlC and Ti2AlN MAX phase coatings manufactured in an industrial-size coater KW - MAX Phase KW - thin films KW - phase transformation KW - Ternary carbides Y1 - 2010 ER - TY - GEN A1 - Wang, Qimin A1 - Flores Renteria, Arturo A1 - Schroeter, Olaf A1 - Mykhaylonka, Ruslan A1 - Leyens, Christoph A1 - Garkas, Wagdi A1 - Baben, Moritz to T1 - Fabrication and oxidation behavior of Cr2AlC coating on Ti6242 alloy Y1 - 2010 ER - TY - GEN A1 - Wang, Qimin A1 - Garkas, Wagdi A1 - Flores Renteria, Arturo A1 - Leyens, Christoph T1 - Oxidation Behaviour of Ti2AlN Films Composed Mainly of Nanolaminated MAX Phase T2 - Journal of nanoscience and nanotechnology KW - Ti2AlN KW - Nanolaminated MAX phase KW - Thin Films KW - Oxidation Y1 - 2010 SN - 1533-4899 VL - 11 IS - 10 SP - 8959 EP - 8966 ER - TY - JOUR A1 - Zhang, Ping A1 - Lindemann, Janny A1 - Leyens, Christoph T1 - Influence of texture and microstructure on mechanical properties of high-strength wrought magnesium alloy AZ80 Y1 - 2006 ER - TY - CHAP A1 - Zhang, Ping A1 - Lindemann, Janny A1 - Leyens, Christoph T1 - Surface rolling on the high-strength wrought magnesium alloy AZ80 Y1 - 2007 ER - TY - JOUR A1 - Ebach-Stahl, Andrea A1 - Fröhlich, Maik A1 - Braun, Reinhold A1 - Leyens, Christoph T1 - Improvement of the High-Temperature Oxidation Resistance of gamma-TiAl by Selectively Pre-treated Si-based Coatings Y1 - 2008 ER -