(1. 上海大学 理学院，上海 200444; 2. 南京大学 物理系 固体微结构物理国家重点实验室, 南京 210093)
摘 要: 通过结构、磁性以及应变测量，研究哈斯勒合金 Ni46Cu4Mn38Sn12 在马氏体相变过程中的相变应变与磁感生应变。结果表明：样品在马氏体相变过程中表现出一个接近0.12% 的相变应变，几乎是目前研究所报, 道的三元哈斯勒合金Ni-Mn-Sn相变应变的3倍；此外，在等温条件下，通过外加磁场的诱导，获得了该样品在反马氏体相变起始温度点 (284 K) 的一个大的磁感生应变，这种行为可归结为马氏体与奥氏体相之间界面的磁弹耦合。
关键字: 哈斯勒合金；马氏体相变；相变应变；磁感生应变
（1. College of Sciences, Shanghai University, Shanghai, 200444, China;
2. National Key Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, China）
Abstract:Both the phase transition strain and magnetic-field-induced strain during martensitic transformation in Ni46Cu4Mn38Sn12 Heusler alloy were investigated by structure, magnetic, and strain measurements. The results show that a large spontaneous strain with the value of about 0.12% upon martensitic transformation is observed in this alloy, which is almost three times as that in ternary Ni-Mn-Sn alloys. In addition, a large field-induced strain is also obtained in this alloy at 284 K. Such behavior can be attributed to magnetoelastic coupling between boundary of martensitic and austenitic phase.
Key words: Heusler alloy; martensitic transition; transition strain; magnetic-field-induced strain
