中国物理B ›› 2017, Vol. 26 ›› Issue (3): 36501-036501.doi: 10.1088/1674-1056/26/3/036501

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Large elastocaloric effect in Ti-Ni shape memory alloy below austenite finish temperature

Xiao-Hua Luo(罗小华), Wei-Jun Ren(任卫军), Wei Jin(金伟), Zhi-Dong Zhang(张志东)   

  1. 1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • 收稿日期:2016-10-24 修回日期:2016-12-10 出版日期:2017-03-05 发布日期:2017-03-05
  • 通讯作者: Wei-Jun Ren E-mail:wjren@lmr.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 51671192 and 51531008) and the Chinese Academy of Sciences (Grant No. KJZD-EW-M05).

Large elastocaloric effect in Ti-Ni shape memory alloy below austenite finish temperature

Xiao-Hua Luo(罗小华)1, Wei-Jun Ren(任卫军)1, Wei Jin(金伟)2, Zhi-Dong Zhang(张志东)1   

  1. 1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2016-10-24 Revised:2016-12-10 Online:2017-03-05 Published:2017-03-05
  • Contact: Wei-Jun Ren E-mail:wjren@lmr.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 51671192 and 51531008) and the Chinese Academy of Sciences (Grant No. KJZD-EW-M05).

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摘要：

Solid refrigeration technology based on the elastocaloric effect has a great potential alternative to the conventional vapor compression cooling. Here we report the large elastocaloric effect in Ti-Ni (50 at%) shape memory alloy below its austenite finish temperature Af under different strain. Both Maxwell's and Clausius-Clapeyron equations are used to estimate the entropy change. The strain-induced entropy change increases with raising the strain and gets a maximum value at a few kelvins below Af. The maximum entropy changes ΔSmax are -20.44 and -53.70 J/kg·K, respectively for 1% and 2% strain changes. Large entropy change may be obtained down to 20 K below Af. The temperature of the maximum entropy change remains unchanged before the plastic deformation appears but moves towards low temperature when the plastic deformation happens.

关键词: elastocaloric effect, martensitic transformation, shape memory alloys

Abstract:

Solid refrigeration technology based on the elastocaloric effect has a great potential alternative to the conventional vapor compression cooling. Here we report the large elastocaloric effect in Ti-Ni (50 at%) shape memory alloy below its austenite finish temperature Af under different strain. Both Maxwell's and Clausius-Clapeyron equations are used to estimate the entropy change. The strain-induced entropy change increases with raising the strain and gets a maximum value at a few kelvins below Af. The maximum entropy changes ΔSmax are -20.44 and -53.70 J/kg·K, respectively for 1% and 2% strain changes. Large entropy change may be obtained down to 20 K below Af. The temperature of the maximum entropy change remains unchanged before the plastic deformation appears but moves towards low temperature when the plastic deformation happens.

Key words: elastocaloric effect, martensitic transformation, shape memory alloys

中图分类号:  (Thermal expansion; thermomechanical effects)

  • 65.40.De
46.25.Hf (Thermoelasticity and electromagnetic elasticity (electroelasticity, magnetoelasticity)) 62.20.fg (Shape-memory effect; yield stress; superelasticity)