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Chin. Phys. B, 2017, Vol. 26(3): 036501    DOI: 10.1088/1674-1056/26/3/036501

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 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

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.

Keywords:  elastocaloric effect      martensitic transformation      shape memory alloys  
Received:  24 October 2016      Revised:  10 December 2016      Accepted manuscript online: 
PACS:  65.40.De (Thermal expansion; thermomechanical effects)  
  46.25.Hf (Thermoelasticity and electromagnetic elasticity (electroelasticity, magnetoelasticity))  
  62.20.fg (Shape-memory effect; yield stress; superelasticity)  

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).

Corresponding Authors:  Wei-Jun Ren     E-mail:

Cite this article: 

Xiao-Hua Luo(罗小华), Wei-Jun Ren(任卫军), Wei Jin(金伟), Zhi-Dong Zhang(张志东) Large elastocaloric effect in Ti-Ni shape memory alloy below austenite finish temperature 2017 Chin. Phys. B 26 036501

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