Effect of crystal orientation on micro-stress distribution in a damage-tolerant titanium alloy TC21

Abstract

Micro-stress distribution interior of TC21 alloy under abrasive processing was systematically investigated by combining EBSD data and crystal plasticity finite element model (CPFEM). The ductility enhanced of ground specimens after aging treatment, which can be attributed to the randomness of crystal orientation increased result in the decrease of micro-stress in polycrystal. For prismatic slip {101¯0}〈12¯10〉, the α-colonies with SF value of 0.16 suggest that further slip activation becomes difficult, leading to a higher local stress concentrated on grain boundaries of α-lamellae. The higher micro-stress almost distributed at the interface of α-lamellae with a preferred orientation, while in randomly oriented grains, higher micro-stress distributed interior of some grains or local interface of α-lamellae. Moreover, the maximum micro-stress in randomly oriented grains is smaller than that of preferred orientation grains.