Temperature Dependence of Activation Enthalpy for Yielding in Bimodal Ti–6Al–4V

作者：Bhargavi Rani Anne, Masaki Tanaka, Tatsuya Morikawa · 发表于：MATERIALS TRANSACTIONS · 年份：2019 · DOI：10.2320/matertrans.me201902 · 被引用次数：20 · 研究领域：Titanium Alloys Microstructure and Properties、Intermetallics and Advanced Alloy Properties、Metal and Thin Film Mechanics

Mechanical properties relating to the thermally activated process of yielding was investigated in Ti–6Al–4V with a bimodal microstructure, consisting of both primary alpha grains and lamellar colonies of secondary alpha/beta lamellae. The temperature dependence of yield stress, effective stress, activation volume, and activation enthalpy were investigated between 77 K and 650 K. The yield stress and effective stress decreased with increasing temperature. It was found that the temperature dependence of activation enthalpy for yielding shows values between those obtained from basal slips and prismatic slips investigated in single crystalline α-titanium. This suggests that the thermally activated processes which control the yielding of bimodal Ti–6Al–4V is the combination of basal and prismatic slips.