期刊
SCIENCE
卷 333, 期 6038, 页码 68-71出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1202232
关键词
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资金
- Japan Society for the Promotion of Science
- Tohoku University, Ministry of Education, Culture, Sports, Science, and Technology
- Grants-in-Aid for Scientific Research [23686097, 11J04139] Funding Source: KAKEN
In superelastic alloys, large deformation can revert to a memorized shape after removing the stress. However, the stress increases with increasing temperature, which limits the practical use over a wide temperature range. Polycrystalline Fe-Mn-Al-Ni shape memory alloys show a small temperature dependence of the superelastic stress because of a small transformation entropy change brought about by a magnetic contribution to the Gibbs energies. For one alloy composition, the superelastic stress varies by 0.53 megapascal/degrees C over a temperature range from -196 to 240 degrees C.
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