Journal
SCRIPTA MATERIALIA
Volume 185, Issue -, Pages 56-60Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.04.007
Keywords
Low-temperature; Superelasticity; Elastocaloric effect; Coefficient of performance; Ni-Mn-Ga-Cu
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Funding
- National Key Research and Development Program of China [2017YFB0702703]
- International Partnership Program of Chinese Academy of Sciences [174433KYSB20180040]
- National Natural Science Foundation of China [51801225, 51771218, 51531008, 51701233]
- Ningbo Natural Science Foundation of China [2019A610174]
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The superelastic behavior and elastocaloric effect of a [001]-textured Ni50Mn23Ga25Cu2 polycrystal have been investigated below room temperature (256-294 K). The adiabatic temperature change caused by rapid unloading of uniaxial stress reached -4.3 K at 259 K. A small stress hysteresis of 14 MPa was observed. Due to the low hysteresis energy loss (0.37 MJ m(-3)) stemming from the texture structure, the coefficient of performance (COPmat) of our alloy was calculated to be 18, indicating that it is a promising elastocaloric candidate for low-temperature refrigeration. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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