Mechanism of {332}<113> twinning formation in cold-rolled Ti-Nb-Ta-Zr-O alloy

Abstract

In this study, the mechanism of {332}<113> twinning formation in cold-rolled Ti-35Nb- 2Ta-3Zr-O (wt%) alloy was investigated based on the Taylor-Bishop-Hill theory. The experimental data of crystal orientation in the rolling bite zone was obtained via electron back-scattered diffraction (EBSD). The deformation energy of {332}<113> twinning in the propagation stage was calculated using data from EBSD in terms of the Hall-Petch-type relation. The calculation results revealed that the mechanism of {332}<113> twinning formation in β-type Ti-35Nb-2Ta-3Zr-O (wt%) alloy contained two valid models, namely the shear-shuffle model and α"-assisted twinning model. This can help to clarify the mechanism of {332}<113> twinning formation further.