中文摘要：

本文通过内耗和交流磁化率，研究了多晶合金Ni54Mn21Ga25的马氏体相变特征，分析了稀土元素Sm对合金中间马氏体相变影响。研究结果表明，添加Sm使合金Ni54Mn21Ga24的马氏体相变温度提高到室温以上，并且降低了合金的温度滞后，在低磁场下Sm对合金磁感生应变影响不大。

英文摘要：

Martensitic transformation was investigated in a polycrystalline alloy Ni54 Mn21Ga25.The influences of rare earth Sm on the martensitic transformation and magnetic properties of Ni54Mn21Ga25Sm0.25 alloy were analyzed. The experimental results show that martensitic transformation temperature was increased to above room temperure ,temperature hysteresis was decreased and magnetic-field-induced strain was not changed by addition of Sin.