Superelastic Effect in Polycrystalline Ferrous Alloys

被引：357

作者：

Omori, T. ^{[1
]}

Ando, K. ^{[1
]}

Okano, M. ^{[1
]}

Xu, X. ^{[1
]}

Tanaka, Y. ^{[1
]}

Ohnuma, I. ^{[1
]}

Kainuma, R. ^{[1
]}

Ishida, K. ^{[1
]}

机构：

[1] Tohoku Univ, Dept Mat Sci, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

来源：

SCIENCE | 2011年 / 333卷 / 6038期

基金：

日本学术振兴会;

关键词：

SHAPE-MEMORY ALLOYS; MN-AL; THERMODYNAMIC CALCULATION; PHASE-EQUILIBRIA; TRANSFORMATION; BEHAVIOR; SYSTEM;

D O I：

10.1126/science.1202232

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：68 / 71

页数：4

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