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Study on formation mechanism of {332}$$<$$113$$>$$ deformation twinning in metastable $$beta$$-type Ti alloy focusing on stress-induced $$alpha"$$ martensite phase

Cho, K.*; Morioka, Ryota*; Harjo, S.; Kawasaki, Takuro; Yasuda, Hiroyuki*

Deformation behavior of Ti-12Mo alloy which is primarily deformed by {332}$$<$$113$$>$$ deformation twinning was studied by in situ neutron diffraction measurements and deformation structure analyses, focusing on the formation of stress-induced $$alpha"$$ martensite phase. We directly observed for the first time that the $$alpha"$$ phase was formed at the initial stage of the plastic deformation and the volume fraction of the phase increased with increasing plastic deformation. This stress-induced $$alpha"$$ martensite phase acts as a nucleation site for the {332}$$<$$113$$>$$ twins. Further increase in stress results in a replacement of the $$alpha"$$ phase by the {332}$$<$$113$$>$$ twins.

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Category:Nanoscience & Nanotechnology

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