哈斯勒合金Ni_(46)Cu_4Mn_(38)Sn_(12)的相变应变与磁感生应变

Phase transition strain and magnetic-field-induced strain in Ni_(46)Cu_4Mn_(38)Sn_(12) Heusler alloy

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。

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.