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The microstructural evolution and deformation micromechanism of cold-deformed TiNi based alloys, both in the martensite and parent phase conditions, have been reviewed in the present paper. The emphasis is placed on the modification of the microstructure through atomic migration such as the coalescence and rearrangement of martensite variants and the adjustment and development of internal twinning...
The effect of Cu addition on the phase transformation and microstructure of TiNiHf high temperature shape memory alloy has been studied. The experimental results show that the TiNiHfCu alloy undergoes a B2↔B19′ transformation with a concentration of 3at.% Cu. And a two-step phase transformation occurs upon heating when the Cu content is 5at.%. The constitutional phases of TiNiHfCu quaternary alloys...
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