Xia Qinhan, Tan Changlong, Han Binglun, Tian Xiaohua, Zhao Lei, Zhao Wenbin, Ma Tianyou, Wang Cheng, Zhang Kun
School of Science, Harbin University of Science and Technology, Harbin 150080, China.
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China.
Materials (Basel). 2022 Aug 26;15(17):5889. doi: 10.3390/ma15175889.
Ni-Mn-Sn ferromagnetic shape memory alloys, which can be stimulated by an external magnetic field, exhibit a fast response and have aroused wide attention. However, the fixed and restricted working temperature range has become a challenge in practical application. Here, we introduced strain engineering, which is an effective strategy to dynamically tune the broad working temperature region of Ni-Co-Mn-Sn alloys. The influence of biaxial strain on the working temperature range of Ni-Co-Mn-Sn alloy was systematically investigated by the ab initio calculation. These calculation results show a wide working temperature range (200 K) in NiCoMnSn FSMAs can be achieved with a slight strain from 1.5% to -1.5%, and this wide working temperature range makes NiCoMnSn meet the application requirements for both low-temperature and high-temperature (151-356 K) simultaneously. Moreover, strain engineering is demonstrated to be an effective method of tuning martensitic transformation. The strain can enhance the stability of the NiCoMnSn martensitic phase. In addition, the effects of strain on the magnetic properties and the martensitic transformation are explained by the electronic structure in NiCoMnSn FSMAs.
镍锰锡铁磁形状记忆合金可被外部磁场激发，具有快速响应特性，已引起广泛关注。然而，其固定且受限的工作温度范围在实际应用中成为一项挑战。在此，我们引入了应变工程，这是一种动态调节镍钴锰锡合金宽工作温度区域的有效策略。通过第一性原理计算系统研究了双轴应变对镍钴锰锡合金工作温度范围的影响。这些计算结果表明，镍钴锰锡铁磁形状记忆合金在1.5%至 -1.5%的微小应变下可实现200 K的宽工作温度范围，且这一宽工作温度范围使镍钴锰锡同时满足低温和高温（151 - 356 K）的应用要求。此外，应变工程被证明是调节马氏体相变的有效方法。应变可增强镍钴锰锡马氏体相的稳定性。另外，通过镍钴锰锡铁磁形状记忆合金的电子结构解释了应变对磁性能和马氏体相变的影响。
