期刊
PHYSICAL REVIEW B
卷 83, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.174204
关键词
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资金
- JSPS
- National Science Foundation of China [50720145101, 50771079]
- National Basic Research Program of China [2010CB631003]
- NCET
- 111 Project of China [B06025]
- Ruhr-University Bochum [SFB 459]
- Alexander von Humboldt Foundation
- Grants-in-Aid for Scientific Research [22360278] Funding Source: KAKEN
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 an R-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.
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