Large elastocaloric effect in Ti-Ni shape memory alloy below austenite finish temperature
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...
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| Published in | Chinese physics B Vol. 26; no. 3; pp. 426 - 429 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.03.2017
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| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
| DOI | 10.1088/1674-1056/26/3/036501 |
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| Summary: | 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 ASrnax 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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| Bibliography: | elastocaloric effect, martensitic transformation, shape memory alloys 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 ASrnax 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. 11-5639/O4 Xiao-Hua Luo1,Wei-Jun Ren1, Wei Jin2, and Zhi-Dong Zhang1（1 Shenyang Natlonal Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China） |
| ISSN: | 1674-1056 2058-3834 |
| DOI: | 10.1088/1674-1056/26/3/036501 |