Guo Shihai~(1~*),Zhang Yanghuan~1,Zhao Zengqi,Qi Yan1,Quan Baiyun1,Wang Xinlin1(1.Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China; 2. Baotou Research Institute of Rare Earth, Baotou 014010, China)
The effects of small amount additions of Sm on the martensitic transition and magnetic phase transition of polycrystalline Ni-Mn-Ga alloys were investigated. The experimental results show that the Sm doped alloys also undergo a thermal-elastic martensitic transformation and reverse transformation during cooling and heating process and the addition of Sm decreases the martensitic transformation temperature and Curie temperature in different degree respectively. Ni-Mn-Ga alloys of adding Sm still possess Heusler structure, but their crystal lattice parameters are modified slightly. The addition of a proper amount of Sm does not basically decrease T_c of the alloy when avoiding the appearance of second phase. In addition, the doped alloys have favorable toughness because of grain refinement of Sm.
Ni-Mn-Ga alloy; shape memory alloy; martensitic transformation;ferromagnetic phase transformation;rare earths
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