(1. 上海大學(xué) 理學(xué)院，上海 200444; 2. 南京大學(xué) 物理系 固體微結(jié)構(gòu)物理國(guó)家重點(diǎn)實(shí)驗(yàn)室, 南京 210093)
摘 要: 通過(guò)結(jié)構(gòu)、磁性以及應(yīng)變測(cè)量，研究哈斯勒合金 Ni46Cu4Mn38Sn12 在馬氏體相變過(guò)程中的相變應(yīng)變與磁感生應(yīng)變。結(jié)果表明：樣品在馬氏體相變過(guò)程中表現(xiàn)出一個(gè)接近0.12% 的相變應(yīng)變，幾乎是目前研究所報(bào), 道的三元哈斯勒合金Ni-Mn-Sn相變應(yīng)變的3倍；此外，在等溫條件下，通過(guò)外加磁場(chǎng)的誘導(dǎo)，獲得了該樣品在反馬氏體相變起始溫度點(diǎn) (284 K) 的一個(gè)大的磁感生應(yīng)變，這種行為可歸結(jié)為馬氏體與奧氏體相之間界面的磁彈耦合。
關(guān)鍵字: 哈斯勒合金；馬氏體相變；相變應(yīng)變；磁感生應(yīng)變
（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
