Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 4: Mechanical Properties I
MM 4.5: Vortrag
Montag, 26. März 2012, 11:15–11:30, H 0106
Severe deformation twinning in pure copper by cryogenic wire drawing — •Alexander Kauffmann1,2, Jens Freudenberger1,3, David Geissler1,2, Song Yin1,2, Wolfram Schillinger4, V. Subramanya Sarma5, Mohsen S. Khoshkhoo1, Horst Wendrock1, Jürgen Eckert1,2, and Ludwig Schultz1,2 — 1IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, 01062 Dresden, Germany — 3TU Bergakademie Freiberg, Institute of Materials Science, 09596 Freiberg, Germany — 4Wieland-Werke AG, Graf-Arco-Straße 36, 89079 Ulm, Germany — 5Dept. Metallurgical and Materials Engineering, IIT Madras, Chennai 600036, India
The effect of deformation at 77 K on the activation of deformation twinning in pure copper during wire drawing was investigated. For this purpose, cryogenic wire drawing was performed utilizing molybdenum disulfide lubrication. Microstructural investigation and texture analysis reveal severe twin formation with broad twin size distribution.
This result is discussed by means of the orientation dependence of deformation twinning in fcc metals and the applied state of stress during wire drawing. Remarkable differences compared to cryogenic rolling with its limited contribution of twinning to grain refinement are highlighted.