ABSTRACT

An anomalous deformation texture evolution has been observed in high-stacking-fault-energy pure platinum during cold rolling. A maximum of 98% thickness reduction, equivalent to a true strain of 3.9, was imposed. The evolution of texture observed during rolling is characterised as sluggish and the starting texture was retained up to very large rolling strains. The evolution of a characteristic rolling texture and its strengthening was dramatic and observed only after 95% thickness reduction. The retarded evolution of texture in platinum is explained by the activity of an unusual non-octahedral slip system. To understand the contribution of non-octahedral slip systems towards texture evolution, visco-plastic self-consistent simulation was carried out. The simulation results show that the activation of {100}<011> non-octahedral slip system slows down the evolution of final texture. Detailed electron back-scatter diffraction microstructural analysis was carried out to understand the deformation mechanisms and its influence on delayed texture evolution.

摘要

在冷轧过程中，在高堆垛层错能纯铂中观察到异常变形织构演变。施加最大 98% 的厚度减少，相当于 3.9 的真实应变。在轧制过程中观察到的织构演变的特征是缓慢的，并且在非常大的轧制应变下仍保留了起始织构。特征轧制织构的演变及其强化是显着的，并且仅在厚度减少 95% 后才能观察到。铂中织构的延迟演化是由一种不寻常的非八面体滑移系统的活性来解释的。为了了解非八面体滑移系统对纹理演化的贡献，进行了粘塑性自洽模拟。仿真结果表明，{100}<011>的激活 非八面体滑移系统减慢了最终纹理的演变。进行了详细的电子背散射衍射显微结构分析，以了解变形机制及其对延迟纹理演化的影响。