面心纯铝轧制织构的晶体塑性有限元模拟

Simulation of the rolling texture of pure Al using crystal plasticity finite element method

基于率相关晶体塑性本构模型,分别将Taylor模型和有限单元模型两种多晶模型嵌入大型有限元程序ABAQUS,实现了晶体塑性学有限元模拟.直接将电子背散射衍射(EBSD)获取的晶粒初始取向输入晶体塑性有限元模型,预测了两种不同应变情况下面心1050纯铝轧制织构的演化.模拟结果与EBSD实验测得的织构演化结果有较好的一致性,随着变形程度的增加,预测织构与实测织构变得更加锋锐.经过比较,Taylor型模型预测出了{4411}〈11118〉的Dillamore取向,而有限单元模型预测出了铜型织构取向,比Taylor模型预测结果更接近实验验证结果.两种模型并不能预测出{011}〈211〉黄铜取向、{123}〈523〉S取向、{011}〈100〉Goss取向及其他理想取向.

The Taylor-type and finite element polycrystal model were incorporated into the commercial finite element code ABAQUS on the basis of the crystal plasticity theory of rate-dependent polycrystal constitutive relations. Initial orientations obtained by electron backscatter diffraction （EBSD） were directly input into the crystal plasticity finite element model （CPFEM） to simulate the rolling texture of fcc 1 050 pure A1 at two stains. Comparisons of simulated and experimental results showed that texture predictions of cold rolling by the finite element model were more approximate to the experiment result. The Taylor-type model predicted that orientations accumulated in the {4 4 11} （11 11 8） orientation which would be called Dillamore orientation. The finite element model predicted the copper orientation that was more approximate to the experiment result than Taylortype model. No {011} （211） brass orientation, {123} （523） S orientation, {011} （100） Goss orientation and other ideal orientations were simulated.