Martensitic Transformation and Magnetic-Field-Induced Strain in Ni-Mn-Ga-RE(RE=Tb,Sm) Alloys
来源期刊：JOURNAL OF RARE EARTHS2004年第5期
论文作者：张羊换 王新林 赵增祺 李健靓 郭世海
Key words：metal materials; Ni-Mn-Ga alloy; martensitic transformation; magnetic-field-induced strain; shape memory alloy; rare earths;
Abstract: 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 Ni48Mn33Ga19 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.
张羊换1，王新林1，赵增祺2，李健靓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 Earths,Baotou 014010,China)
Abstract: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 Ni48Mn33Ga19 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.
Key words:metal materials; Ni-Mn-Ga alloy; martensitic transformation; magnetic-field-induced strain; shape memory alloy; rare earths;
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