Effects of Sm on Phase Transformation in Ni-Mn-Ga Alloys  

作　　者：郭世海 张羊换 赵增祺 祁焱 全白云 王新林 

机构地区：[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

出　　处：《Journal of Rare Earths》2004年第6期875-877,共3页稀土学报（英文版）

基　　金：Projectsupportedby 863Program(2 0 0 1AA3 2 70 2 2 )

摘　　要：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.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.

关 键 词：Ni-Mn-Ga alloy shape memory alloy martensitic transformation ferromagnetic phase transformation rare earths 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TG145[金属学及工艺—合金]