Low-temperature superelasticity and elastocaloric effect in textured Ni-Mn-Ga-Cu shape memory alloys
Low-temperature superelasticity and elastocaloric effect in textured Ni-Mn-Ga-Cu shape memory alloys
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织构Ni-Mn-Ga-Cu形状记忆合金的低温超弹性和弹热效应
DOI：
10.1016/j.scriptamat.2020.04.007
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发表时间：
2020-08-01
影响因子：
6
通讯作者：
Liu, Jian
中科院分区：
文献类型：
--
作者：
Guo, Jianping;Wei, Zhiyang;Liu, Jian
在室温以下（256 - 294 K）研究了[001]织构的Ni50Mn23Ga25Cu2多晶体的超弹性行为和弹热效应。在259 K时，单轴应力快速卸载引起的绝热温度变化达到 -4.3 K。观察到14 MPa的小应力滞后。由于织构结构导致的低滞后能量损失（0.37 MJ m⁻³），我们合金的性能系数（COPmat）经计算为18，这表明它是一种有前途的低温制冷弹热候选材料。（C）2020 Acta Materialia Inc. 由Elsevier Ltd.出版。保留所有权利。
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.