Modeling anisotropic strain hardening and deformation textures in low stacking fault energy fcc metals

The main issues and challenges involved in modeling anisotropic strain hard ening and deformation textures in the low stacking fault energy (SFE) fee m etals (e.g. brass) are reviewed and summarized in this paper. The objective of these modeling efforts is to capture quantitatively the major differenc es between the low SFE fee metals and the medium (and high) SFE Fee metals (e.g. copper) in the stress-strain response and the deformation textures. W hile none of the existing models have demonstrated success in capturing the anisotropy in the stress-strain response of the low SFE fee metals, their apparent success in predicting the right trend in the evolution of deformat ion texture is also questionable. There is ample experimental evidence indi cating that the physical mechanism of the transition From the copper textur e to the brass texture is represented wrongly in these models. These experi mental observations demonstrate clearly the need for a new approach in mode ling the deformation behavior of low SFE fee metals. This paper reports new approaches for developing crystal plasticity models for the low SFE fee me tals that are consistent with the reported experimental observations in thi s class of metals. The successes and failures of these models in capturing both the anisotropic strain hardening and the deformation textures in brass are discussed in detail. (C) 2001 Elsevier Science Ltd. All rights reserve d.