Abstract
Ti-55531 alloy with an acicular α initial microstructure was hot-compressed at 998 K using strain rates of 0.001 and 1 s−1. The effects of strain rate on the fragmentation of acicular α were investigated using electron backscatter diffraction (EBSD) from the standpoint of grain boundary evolution, e.g. low/high angle boundaries (LABs/HABs), the evolution of microtexture and the destruction of the Burgers orientation relationship (BOR) at α/β boundaries. Changes in the LAB fraction and average misorientation up to equilibrium indicate that the formation of LABs and a subsequent transition to HABs are prerequisites for the fragmentation of acicular α. The weakening of microtexture results from the formation of LABs/HABs in acicular α and the destruction of the BOR at α/β boundaries.
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