Texture evolution in platinum: the role of non-octahedral slip

Abstract

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.