The authors would like to acknowledge the funding by the Deutsche Forschungsgemeinschaft (DFG) within the Forschergruppe 544 and the Cluster of Excellence “Engineering of Advanced Materials”.
Macro- and Nanomechanical Properties and Strain Rate Sensitivity of Accumulative Roll Bonded and Equal Channel Angular Pressed Ultrafine-Grained Materials†
Article first published online: 3 JAN 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 13, Issue 4, pages 251–255, April, 2011
How to Cite
Böhner, A., Maier, V., Durst, K., Höppel, H. W. and Göken, M. (2011), Macro- and Nanomechanical Properties and Strain Rate Sensitivity of Accumulative Roll Bonded and Equal Channel Angular Pressed Ultrafine-Grained Materials. Adv. Eng. Mater., 13: 251–255. doi: 10.1002/adem.201000270
- Issue published online: 25 MAR 2011
- Article first published online: 3 JAN 2011
- Manuscript Revised: 9 NOV 2010
- Manuscript Received: 2 SEP 2010
Several processes of severe plastic deformation are suitable for the production of materials with ultrafine-grained microstructures which are known to exhibit high strength and often good ductility as well as strain rate sensitive behavior. The most promising ones are equal channel angular pressing (ECAP) for bulk material and accumulative roll bonding (ARB) for the production of sheet material. In order to evaluate the influence of the process on these mechanical properties and the strain rate sensitivity, tensile tests, and nanoindentation tests were performed on material produced up to similar effective plastic strains of εARB = 6.4 and εECAP = 6.3. It could be shown that the macroscopic strength is slightly higher for ARB than for ECAP material and vice versa in nanoindentation. Independent of the testing method, the strain rate sensitivities and activation volumes are similar for both materials. Thus, both processes performed up to similar effective plastic strains lead to comparable improvements in the mechanical properties. Additionally it could be shown, that this comparison allows the identification of the dominant deformation mechanism which is responsible for the observed strain rate sensitivity.