Stress-Induced α" Martensitic Transformation Mechanism in Deformation Twinning of Metastable β-Type Ti-27Nb-0.5Ge Alloy under Tension

초록

In this study, the formation mechanism of the stress-induced alpha '' martensitic phase in the deformation twinning (DT) band of metastable beta-type Ti-27Nb-0.5Ge (at.%) alloy under tension was investigated. A preferential nucleation site for the stress-induced alpha '' martensitic transformation is inside a DT band with high dislocation density. The alpha '' martensitic phase developed in the DT band with increasing applied plastic strain. The alpha '' martensitic phase subsequently grew to intersect other DT bands, forming secondary DT bands themselves in the parent beta grains.

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