|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-155: Towards an Understanding of Shear Band Formation in Nanocrystalline and Ultrafine-grained Single Phase Materials
||Oliver Renk, Pradipta Ghosh, Reinhard Pippan
|On-Site Speaker (Planned)
The limited strain hardening capacity of nanocrystalline (nc) or ultrafine-grained (UFG) materials reduces their ductility compared to the coarse grained counterparts. This reduction in ductility is often caused by strain localization along shear bands. Interestingly, shear band formation can even be observed during compression or cold rolling where no geometric softening occurs. Although frequently observed, detailed understanding of the formation conditions is still incomplete.
A variety of nc and UFG materials, synthesized by high pressure torsion and further deformed by cold rolling, was studied to understand the conditions for shear band formation. The samples were rolled along two different orientations with respect to the rolling coordinate system. It will be shown, that only materials with a specific starting texture with respect to the rolling coordinate frame exhibit shear band formation. Therefore it is possible to overcome shear band formation in UFG materials by an appropriate choice of the sample orientation.
||Planned: Supplemental Proceedings volume