Giant magnetoresistance, magnetostrain and magnetocaloric effects in a Cu-doped < 001 > -textured Ni45Co5Mn36In13.2Cu0.8 polycrystalline alloy
Giant magnetoresistance, magnetostrain and magnetocaloric effects in a Cu-doped < 001 > -textured Ni45Co5Mn36In13.2Cu0.8 polycrystalline alloy
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DOI：
10.1016/j.jallcom.2021.161652
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发表时间：
2021-08-26
影响因子：
6.2
通讯作者：
Zuo, Liang
中科院分区：
文献类型：
--
作者：
Huang, Xiao-Ming;Zhao, Ying;Zuo, Liang
Ni-Mn-Z（Z = In、Sn和Sb）变磁形状记忆合金由于磁场诱导的可逆马氏体相变而表现出大量最先进的磁响应效应。对于这种化合物，实现高的磁化差，大的相变熵变，相变温度的强场依赖性，和低热滞后是必不可少的，以获得显着的磁响应功能特性。在这项工作中，从Ni 45 Co 5 Mn 36 In 14合金开始，引入Cu替代In以同时优化这些性能，从而引起磁响应效应的实质性改善。通过成分设计，选择了相温度低于室温的无第二相Ni45Co5Mn36In13.2Cu0.8合金。利用定向凝固技术制备了强< 001 >织构样品，以提高磁响应性能.测量结果表明，样品的可逆磁电阻和磁致应变分别达到-79%和0.24%。在磁场变化为1.5T时，样品的最大等温磁熵变为16.0J kg（-1）K-1，最大绝热温变为-3.4K，表现出良好的低场磁热响应。该研究为NiMn基合金的开发提供了一种原型合金，为磁性形状记忆合金的发展提供了参考。(C)2021爱思唯尔有限公司版权所有。
Ni-Mn-Z (Z = In, Sn, and, Sb) metamagnetic shape memory alloys exhibit plenty of state-of-the-art magnetoresponsive effects owing to the magnetic-field-induced reversible martensitic transformation. For this compound, achieving high magnetization difference, large transformation entropy change, strong field dependence of transformation temperature, and low thermal hysteresis is essential to obtain significant magnetoresponsive functional properties. In this work, starting from the Ni45Co5Mn36In14 alloy, the substitution of Cu for In is introduced to optimize these properties simultaneously, giving rise to the substantial improvement in the magnetoresponsive effects. By composition design, a second-phase freed Ni45Co5Mn36In13.2Cu0.8 alloy with the phase temperature just below room temperature was selected. Using the directionally solidified technique, a strong < 001 > -textured sample is prepared to enhance magnetoresponsive behaviors. Measurements show that the reversible magnetoresistance and magnetic-field-induced strain of the prepared sample reach -79% and 0.24%, respectively. Moreover, a maximum isothermal magnetic entropy change of 16.0 J kg(-1) K-1 and the maximum adiabatic temperature change of -3.4 K are measured under a field change of 1.5 T, showing excellent low-field magnetocaloric response. The work is expected to supply a prototype alloy of NiMn-based alloy to promote the development of magnetic shape memory alloy. (C) 2021 Elsevier B.V. All rights reserved.