Effects of Sm on Phase Transformation in Ni-Mn-Ga Alloys
来源期刊：JOURNAL OF RARE EARTHS2004年第6期
论文作者：张羊换 王新林 赵增祺 全白云 祁焱 郭世海
Key words：Ni-Mn-Ga alloy; shape memory alloy; martensitic transformation; ferromagnetic phase transformation; rare earths;
Abstract: 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 Tc of the alloy when avoiding the appearance of second phase. In addition, the doped alloys have favorable toughness because of grain refinement of Sm.
张羊换1，王新林1，赵增祺2，全白云1，祁焱1，郭世海1
(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)
Abstract: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 Tc of the alloy when avoiding the appearance of second phase. In addition, the doped alloys have favorable toughness because of grain refinement of Sm.
Key words:Ni-Mn-Ga alloy; shape memory alloy; martensitic transformation; ferromagnetic phase transformation; rare earths;
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