| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Elastocaloric effect and mechanical behavior for NiTi shape memory alloys |
| Min Zhou(周敏)1, Yu-Shuang Li(李玉霜)2, Chen Zhang(张晨)2, Lai-Feng Li(李来风)1 |
1 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
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Abstract The NiTi shape memory alloy exhibits excellent superelastic property and elastocaloric effect. The large temperature change (ΔT) value of 30 K upon loading and -19 K upon unloading are obtained at room temperature, which are higher than those of the other NiTi-based materials and among the highest values reported in the elastocaloric materials. The asymmetry of the measured ΔT values between the loading and unloading process is ascribed to the friction dissipation. The large temperature change originates from the large entropy change during the stress-induced martensite transformation (MT) and the reverse MT. A large coefficient-of-performance of the material is obtained to be 11.7 at ε=1%, which decreases with increasing the applied strain. These results are very attractive in the present solid-state cooling, which potentially could replace the vapor compression refrigeration technologies.
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Received: 18 April 2018
Revised: 11 June 2018
Accepted manuscript online:
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PACS:
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65.40.gd
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(Entropy)
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46.25.Hf
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(Thermoelasticity and electromagnetic elasticity (electroelasticity, magnetoelasticity))
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62.20.fg
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(Shape-memory effect; yield stress; superelasticity)
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| Fund: Project supported by the Science Fund from the Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (TIPC, CAS) (Grant Nos. CRYOQN201501 and CRYO201218) and the National Natural Science Foundation of China (Grant Nos. 51577185, 51377156, and 51408586). |
Corresponding Authors:
Min Zhou, Lai-Feng Li
E-mail: mzhou@mail.ipc.ac.cn;laifengli@mail.ipc.ac.cn
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Cite this article:
Min Zhou(周敏), Yu-Shuang Li(李玉霜), Chen Zhang(张晨), Lai-Feng Li(李来风) Elastocaloric effect and mechanical behavior for NiTi shape memory alloys 2018 Chin. Phys. B 27 106501
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