Extension of Crystal Plasticity Models to Include Deformation Twinning Application to Non-Homogeneous Deformations in FCC and HCP Metals

开发了基于晶体塑性的模型和模拟工具，用于描述低层错能fcc金属和hcp金属的大变形过程，对各向异性应力应变响应和平均晶体织构都有很好的预测能力。A黄铜(一种低SFE的fcc金属)和商业纯钛(hcp金属)被用作研究的模型材料。这项研究对金属加工业有很大的影响，因为它提供了预测工具，产生了大量关于变形过程中组织演变的定量信息。材料的微结构状态很重要，因为它在变形过程中的形状和尺寸控制、所生产部件的结构完整性以及在使用中的性能特征方面起着主导作用。

Crystal plasticity based models and simulation tools are developed for bulk deformation processes involving large deformations in both low stacking fault energy (SFE) fcc metals as well as in hcp metals with good predictive capabilities for both the anisotropic stress-strain response as well as the averaged crystallographic texture. a-brass (a low SFE fcc metal) and commercially pure titanium (hcp metal) are used as model materials for the study. The study has a strong impact on the metal working industry as it provides predictive tools that yield a large amount of quantitative information on microstructure evolution during deformation. The microstructural state of a material is important as it plays a governing role in shape and size control during deformation processing, structural integrity of the produced component, and its performance characteristics in service.