高ひずみ速度下におけるβ-Ti合金の大変形

概要

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The compressive large deformation of β-Ti alloy was investigated at temperatures from 77K to 673K and at strain rates upto 1.2×10^4 S^<-1> At low temperatures, a work-softening was observed on the true stress-strain relation, while it was not so significant at high temperatures. The temperature change due to the heat conversion of plastic work and the strain rate change during deformation were taken to account the experimental results. It was found that the thermally activated process concept gave plausible understandings of the experimental results and could provide an informative prediction of dynamic behaviours of the material at large deformation. Metallographic observations revealed the frequent appearance of mechanical twinnings in the relatively early stage of high velocity deformation at low temperatures, and they played an effective barrier against the successive dislocation motion and caused significant work hardening at large strains.
1995-06-15