Cu对Ni50Mn36In14相变和磁性的影响

文章研究了Cu替代部分Ni对铁磁性形状记忆合金Ni₅₀Mn₃₆In₁₄相变和磁性的影响规律. 研究表明,在Ni_50-xCu_xMn₃₆In₁₄中,随着Cu含量的增加,相变温度逐渐降低. Cu含量低于5%时,奥氏体的磁性强于马氏体的磁性, 母相和马氏体相的饱和磁化强度的差值ΔM随着Cu含量的增加而增大. 当Cu含量x=4.5时, ΔM迅速增加到80 emu/g, 并在该材料中观察到了磁场驱动的马氏体到奥氏体的转变,显示了该材料作为磁驱动磁电阻材料的潜在应用前景.当Cu含量高于5%时,奥氏体保持铁磁状态, 马氏体相由反铁磁状态变为铁磁状态,马氏体的磁性强于奥氏体的磁性, ΔM大大削弱,磁场驱动性质消失.

The influence of Cu on the magnetic and martensitic transformation properties of Ni50Mn36In14

In this paper,we investigate the magnetic and martensitic transformation properties of Cu doping partial Ni in Ni₅₀Mn₃₆In₁₄ alloy. It is found that the critical temperature of the martensitic transformation decreases with Cu concentration x in Ni_50-xCu_xMn₃₆In₁₄ increases.While Cu concentration is less than 5%at.,the magnetization of austenite phase is stronger than that of martensite phase,and AM of magnetization martensite and austenite increases with Cu doping.AM increases rapidly to 80 emu/g when x=4.5 and a fieldinduced transformation is observed in this alloy,predicting the application potential as the magnetic actuation and magnetoresistance materials.As Cu content increases to x>5,the magnetization of austenite becomes weaker than that of martnensite,△M decreases to near zero.