Abstract
This study examined the effect of grain size on the tensile properties in {332}<113> twinning-induced plasticity (TWIP) Ti–15Mo alloy and Ti–15Mo–1Fe alloy deformed by dislocation slip for comparison. At the yield point, a large Hall-Petch coefficient was observed for {332}<113> twinning, which was not only due to the increased stress concentration from the interaction between the activated twins before the macroscopic yield and the grain boundary, but also a larger twin volume for macroscopic yield in the coarse-grained Ti–15Mo alloy. It gradually decreased with increasing strain, and negative values were obtained at strains above 0.23. The dynamic Hall-Petch relation was established by the effective grain size, which was similar at strains of up to 0.20 in Ti–15Mo alloy with static grain sizes of 29 μm and 108 μm. The decreasingly modified Hall-Petch coefficient was resulted from the successive occurrence of twinning activation, twinning suppression, and the twin-dislocation and dislocation-dislocation interactions.
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