Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.055701
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Funding
- National Basic Research Program of China [2012CB619401, 2014CB644003]
- National Natural Science Foundation of China [51171140, 51231008, 51320105014, 51321003, 51201125, 51431007]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13034]
- Program of Introducing Talents of Discipline to Universities in China [B06025]
- Grants-in-Aid for Scientific Research [26289245] Funding Source: KAKEN
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We report that R martensite isothermally forms with time in a solution-treated Ti48.7Ni51.3 single crystal. This abnormal formation originates from the growth of a short-range ordered R phase with time, i.e., the crystallization of strain glass. The established time-composition-temperature Ti-Ni diagram shows a time evolution of the R phase and composition-temperature phase diagram. The presence or absence of the R phase in this new diagram, as well as in other conditions (like doping Fe or aging), is explained in a unified framework of free-energy landscape. Our finding suggests a new mechanism for the isothermal martensite formation, which could be applied to other metal and ceramic martensitic systems to find new phases and novel properties.
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