| Large elastocaloric effect in Ti–Ni shape memory alloy below austenite finish temperature |
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| 引用本文： | 罗小华,任卫军,金伟,张志东.Large elastocaloric effect in Ti–Ni shape memory alloy below austenite finish temperature[J].中国物理 B,2017,26(3):36501-036501. |
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| 作者姓名： | 罗小华 任卫军 金伟 张志东 |
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| 作者单位： | 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 |
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| 基金项目： | 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 A_f 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 A_f. The maximum entropy changes ?S_(max) are-20.44 and-53.70 J/kg·K, respectively for 1% and2% strain changes. Large entropy change may be obtained down to 20 K below A_f. The temperature of the maximum entropy change remains unchanged before the plastic deformation appears but moves towards low temperature when the plastic deformation happens.
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| 收稿时间： | 2016-10-24 |
Large elastocaloric effect in Ti-Ni shape memory alloy below austenite finish temperature |
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| Institution: | 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 |
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| 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. |
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| Keywords: | elastocaloric effect martensitic transformation shape memory alloys |
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