@article{ViehwegerKarabetDuering, author = {Viehweger, Bernd and Karabet, Andrey and D{\"u}ring, Michael}, title = {Schmieden der Mg-Legierungen AZ31 und AZ80}, abstract = {Mittels einer hydraulischen Presse sind Schmiedeversuche bei eingestellten St{\"o}ßelgeschwindigkeiten von 1 bis 40 mm/s durchgef{\"u}hrt worden. Schmiedest{\"u}cke einer vereinfachten Geometrie konnten ausgehend vom AZ31- und AZ80-Ausgangsmaterial im stranggegossenen und stranggepressten Zustand ohne Auftreten {\"a}ußerer Fehler hergestellt werden.}, language = {de} } @inproceedings{ViehwegerDueringKarabetetal., author = {Viehweger, Bernd and D{\"u}ring, Michael and Karabet, Andrey and Hartmann, Hansj{\"o}rg}, title = {Evaluation of Forming Behaviour and Tribological Properties of Magnesium Sheet-metal Directly Rolled From Semi-continuously Casted Feedstock}, series = {Magnesium, proceedings of the 7th International Conference on Magnesium Alloys and Their Applications}, booktitle = {Magnesium, proceedings of the 7th International Conference on Magnesium Alloys and Their Applications}, editor = {Kainer, Karl Ulrich}, publisher = {Wiley-VCH Verl.}, address = {Weinheim}, isbn = {978-3-527-31764-6}, pages = {377 -- 385}, abstract = {The formability of AZ31-sheet-metal rolled directly from optimised semi-continuously casted feedstock was investigated. Forming limit diagrams and limiting drawing ratios have been evaluated. Flow stress curves were determined using optical deformation analysis system. The influence of surface treatment on friction behavior was investigated in tempered strip drawing test.}, language = {en} } @inproceedings{ViehwegerSchaefferDuering, author = {Viehweger, Bernd and Schaeffer, Lirio and D{\"u}ring, Michael}, title = {Microstructural Evolution by hot-working of extrudet and continuously casted Mg-wrought-alloys AZ31 and AZ80}, series = {Magnesium, proceedings of the 7th International Conference on Magnesium Alloys and Their Applications}, booktitle = {Magnesium, proceedings of the 7th International Conference on Magnesium Alloys and Their Applications}, editor = {Kainer, Karl Ulrich}, publisher = {Wiley-VCH Verl.}, address = {Weinheim}, isbn = {978-3-527-31764-6}, pages = {560 -- 568}, abstract = {Forming properties and microstructural evolution during warm forming of extruded and continuously casted Mg-alloys AZ31 und AZ80 were investigated. Mechanical properties, softening behaviour, flow stress curves considering different forming temperatures and strain rates as well as suitable process boundaries are described.}, language = {en} } @article{ViehwegerDuering, author = {Viehweger, Bernd and D{\"u}ring, Michael}, title = {Magnesium - Werkstoff der Zukunft}, abstract = {Magnesium erlebt derzeit eine Renaissance als Leichtbauwerkstoff. Dabei ist das Feld von Produkten, in dem durch Massereduzierung Geschwindigkeits- und Steifigkeitserh{\"o}hungen und vor allem Energieeinsparungen erzielt werden k{\"o}nnen, sehr groß und umfasst neben der Verkehrstechnik auch viele andere Branchen wie beispielsweise den Maschinenbau und die Kommunikationstechnik. In dem Beitrag werden Anwendungsgebiete von Magnesiumbauteilen, Entwicklungen bei Magnesiumlegierungen, Verarbeitungsverfahren zur Herstellung von Halbzeugen und Bauteilen, F{\"u}geverfahren f{\"u}r Magnesiumbauteile sowie Zukunftspotenziale und Marktchancen aufgezeigt.}, language = {de} } @inproceedings{ViehwegerDuering, author = {Viehweger, Bernd and D{\"u}ring, Michael}, title = {Magnesium - Werkstoff der Zukunft}, language = {de} } @misc{DueringKarabetViehwegeretal., author = {D{\"u}ring, Michael and Karabet, Andrey and Viehweger, Bernd and Lindemann, Janny and Zhang, Ping}, title = {Magnesium-Knetlegierungen : Innovative Leichtbauwerkstoffe f{\"u}r den Automobilbau}, series = {Forum der Forschung}, volume = {10}, journal = {Forum der Forschung}, number = {19}, issn = {0947-6989}, pages = {41 -- 46}, abstract = {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-gef{\"o}rderten Verbundforschungsvorhabens "MIA-Magnesium im Automobilbau" wurden daher in Zusammenarbeit der Firmen DaimlerChrysler AG, ThyssenKrupp Umformtechnik GmbH, Otto Fuchs Metallwerke KG, Honsel GmbH \& Co. KG, GP Innovation GmbH, OSK Kiefer GmbH sowie der BTU Cottbus die Grundlagen f{\"u}r die prototypische Fertigung von Bauteilen aus den Mg-Knetlegierungen des Typs AZ31 und AZ 80 erarbeitet.}, language = {de} } @article{ViehwegerRichterDueringetal., author = {Viehweger, Bernd and Richter, Gerhard and D{\"u}ring, Michael and Karabet, Andrey and Sviridov, Alexander and Hartmann, Hansj{\"o}rg and Richter, Ulf}, title = {Hydromechanisches Tiefziehen und Hochdruckblechumformung als Verfahren zur Herstellung komplexer Bauteile aus Magnesiumfeinblechen des Typs AZ31B-0 Hydro Mechanical}, series = {Materialwissenschaft und Werkstofftechnik}, volume = {35}, journal = {Materialwissenschaft und Werkstofftechnik}, number = {7}, issn = {0933-5137}, pages = {440 -- 446}, abstract = {Eine gute Umformbarkeit von Blechhalbzeugen aus Magnesiumknetlegierungen stellt sich bekanntlich bei Anwendung von Umformtemperaturen im Bereich von175 Grad Celsius - 240 Grad Celsius ein. Anhand der wirkmedienbasierten Umformverfahren hydromechanisches Tiefziehen und Hochdruckblechumformung ist an handels{\"u}blichen AZ31B-0 Feinblechen die Einstellung unterschiedlicher Umformparameter erobert worden. Im Hinblick auf angewendete Umformverfahren und Versuchsparameter wurden an den Versuchsbauteilen die Blechdickenabnahme und die Radienauspr{\"a}gung bewertet und verglichen. Anhand dieser Ergebnisse werden Hinweise auf die Grenzen des Einsatzes der o.g. Umformverhalten f{\"u}r Magnesiumblech des Legierungstyps AZ31B-0 gegeben.}, language = {de} } @incollection{DueringSchaefferViehweger, author = {D{\"u}ring, Michael and Schaeffer, Lirio and Viehweger, Bernd}, title = {Bulk forming of Mg-alloys AZ31 and AZ 80}, abstract = {Recently, magnesium wrought alloys became an engineering material of constantly increasing interest. For the production of high-yuality products, such as forgings, a profound knowledge concerning the mechanical properties as well as their hot-forming behaviour is of importance.}, language = {de} } @inproceedings{ViehwegerKarabetDuering, author = {Viehweger, Bernd and Karabet, Andrey and D{\"u}ring, Michael}, title = {State of the Art in sheet metal forming of the Mg-alloys AZ31}, language = {en} } @inproceedings{ViehwegerSchaefferDuering, author = {Viehweger, Bernd and Schaeffer, Lirio and D{\"u}ring, Michael}, title = {Hot working behavour of Mg-wrought-alloys AZ 31 and AZ 80}, series = {Proceedings of the XXV SENAFOR, held in Porto Alegre-RS, from 6 to 7th of October of 2005, head of the LdTM-UFRGS, IX International Forging Conference}, booktitle = {Proceedings of the XXV SENAFOR, held in Porto Alegre-RS, from 6 to 7th of October of 2005, head of the LdTM-UFRGS, IX International Forging Conference}, editor = {Schaeffer, Lirio}, address = {Porto Alegre}, language = {en} } @inproceedings{BraeunigDueringHartmannetal., author = {Br{\"a}unig, S. and D{\"u}ring, Michael and Hartmann, Hansj{\"o}rg and Viehweger, Bernd}, title = {Magnesium sheets for industrial application}, series = {Magnesium, proceedings of the 6th International Conference on Magnesium Alloys and their Applications}, booktitle = {Magnesium, proceedings of the 6th International Conference on Magnesium Alloys and their Applications}, editor = {Kainer, Karl Ulrich}, publisher = {Wiley-VCH}, address = {Weinheim}, isbn = {3-527-30975-6}, pages = {955 -- 961}, abstract = {Decreasing the weight of the automotive is an actual problem with high ecological and technical importance. When the engagement of the different car producers to force lightweight construction by the use of light metals in the past was still restricted to some aluminium application, the whole automotive industry now is agreed that the car of the future is a multi material design. New HS and UHS steel grades, aluminium, magnesium, titanium and CFK material are in competition to share in the up-coming automotive material concepts. Despite of the outstanding lightweight properties of magnesium sheets their application today is still limited to single prototypes and pre-industrial trials. The reason for this unsatisfying demand lies on the one hand in the current high price of the magnesium sheets and on the other hand in the higher efforts in the material processing needed. The price of the magnesium sheets clearly depends on the volume of customer demands and the related production capacity. The higher the demand and production, the lower the price. Under this consideration an increase of magnesium sheet production seems only possible when the use of sheets isn't restricted to special internal automotive application (which are now already under several investigation). Widespread application, including small parts outside automotive industry as well as large external automotive parts is needed. In the latter case the quality demand of the magnesium sheets is facing additional requirements concerning the higher geometrical and mechanical properties.}, language = {en} } @inproceedings{ViehwegerRichterKarabetetal., author = {Viehweger, Bernd and Richter, Gerhard and Karabet, Andrey and D{\"u}ring, Michael}, title = {Formability of Mg-3Al-1Zn-Sheet-Metal for the Automotive Industry}, abstract = {In order to determine the parameters for different technical solutions for sheet metal forming, the influence of temperature on the forming behaviour of Mg-3Al-1Zn-sheets has been investigated. Forming limit curves were acquired at temperatures between 175 and 240 ºC. The formability of Mg-3Al-1Zn-blanks in conventional and hydro-mechanical deep drawing as well as high pressure sheet metal forming has been evaluated. Apart from common technologies, applying heated blanks and/or dies, more sophisticated forming technologies were tested by means of locally controlled temperature fields. In order to evaluate the formability of magnesium blanks especially by high pressure sheet metal forming, cup drawing experiments were performed by use of several shapes of a punch. A demonstrator geometry, aligned with determined particularities of Mg-3Al-1Zn - sheet metal forming, was chosen. Finally, demonstrator parts were manufactured by hydro-forming. Supplementary forming tests of tailored blanks have been carried out in order to extend the future application area of commercial sheets.}, language = {en} }