Martensitic Transformation and Magnetic-Field-Induced Strain in Ni-Mn-Ga-RE (RE=Tb, Sm) Alloys  

作　　者：郭世海 张羊换 赵增祺 李健靓 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 Earths, Baotou 014010, China

出　　处：《Journal of Rare Earths》2004年第5期632-635,共4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 microamount additions of RE (Tb, Sm) on martensitic transition, the magnetic-field-induced strain and the bending strength of highly textured polycrystalline Ni_(48)Mn_(33)Ga_(19) alloy were investigated. The experimental results show that the addition of RE elements decreases the martensitic transformation temperature and the Curie temperature. But the bending strength of Ni-Mn-Ga-RE (RE=Tb, Sm) alloys increases remarkably because of the grain refinement. As a result, Ni-Mn-Ga-RE alloys will be applied practically with higher reliability and stability due to favorable plasticity and toughness. In addition, the replacement of small amounts Ga by Tb or Sm decreases the magnetic-field-induced strain of the alloys at room temperature.The effects of microamount additions of RE (Tb, Sm) on martensitic transition, the magnetic-field-induced strain and the bending strength of highly textured polycrystalline Ni_(48)Mn_(33)Ga_(19) alloy were investigated. The experimental results show that the addition of RE elements decreases the martensitic transformation temperature and the Curie temperature. But the bending strength of Ni-Mn-Ga-RE (RE=Tb, Sm) alloys increases remarkably because of the grain refinement. As a result, Ni-Mn-Ga-RE alloys will be applied practically with higher reliability and stability due to favorable plasticity and toughness. In addition, the replacement of small amounts Ga by Tb or Sm decreases the magnetic-field-induced strain of the alloys at room temperature.

关 键 词：metal materials Ni-Mn-Ga alloy martensitic transformation magnetic-field-induced strain shape memory alloy rare earths 

分 类 号：TG139.6[一般工业技术—材料科学与工程]