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Strain glass (STG) in Ni-rich binary Ti-Ni possesses an R-like (rhombohedral) local strain order, but it transforms into B19’ martensite under stress. It remains a puzzle why the local strain order in STG yields a different long-range strain order. Here, we systematically investigated a ternary Ti50Ni44.5Fe5.5 STG, which exhibited the same STG features as the binary STG, and the local strain order is also anR-like one. Different from the binary STG, under stress this ternary STG transforms into a normal R phase rather than B19’. By considering that both systems have bi-instability with respect to both R and B19’ martensites in the schematic free-energy landscape, we provide a unified explanation for the different products of the stress-induced STG to martensite (STG-M) transition between a Ti-Ni binary system and the present ternary system. We show that the differences stem from the competing thermodynamic stability between R-phase and B19’ martensites.

physical review. b, condensed matter and materials physics

Stress-induced strain glass to martensite (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>) transition in a Ti<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Ni<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>44.5</mml:mn></mml:mrow></…

Stress-induced strain glass to martensite (R) transition in a Ti50Ni44.5