Investigation of active slip modes via in-grain misorientation axis and strain compatibility of TA2 alloy during in-situ tensile deformation

Abstract

Slip is an important mechanism to coordinate the deformation in metal materials. Grain boundary can hinder slip transfer, thus lead to strain concentration. This work focus on the law of slip coordination deformation, texture evolution and strain compatibility under different strains. Based on the electron backscattered diffraction (EBSD) technique, the in-situ tensile tests of TA2 alloy were carried out at strain of 2 %, 4 % and 6 %, the activate law of slip under different strains was analyzed by the in-grain misorientation axes (IGMA) method and was verified by Schmid factor (SF). The relationship between grain orientation and strain compatibility at grain boundaries was discussed by calculating the geometric compatibility factor (m′). The results show that the multi-system slip coordination deformation at initial deformation, and the prismatic slip dominates the deformation as the increase of strain. The texture is preferentially distributed in the transverse direction (TD) as the deformation proceeds. The strain concentration is mainly related to the lack of effective plastic deformation mechanism to complete strain transfer at grain boundaries.