Cu对Ni_(50)Mn_(36)In_(14)相变和磁性的影响  

The influence of Cu on the magnetic and martensitic transformation properties of Ni_(50)Mn_(36)ln_(14)

作　　者：柳祝红[1] 伊比[1] 李歌天[1] 马星桥[1] 

机构地区：[1]北京科技大学物理系,北京100083

出　　处：《物理学报》2012年第10期474-478,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51001010);教育部博士点基金新教师基金(批准号:20100006120001)资助的课题~~

摘　　要：文章研究了Cu替代部分Ni对铁磁性形状记忆合金Ni_(50)Mn_(36)In_(14)相变和磁性的影响规律.研究表明,在Ni_(50-x)Cu_xMn_(36)In_(14)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△M随着Cu含量的增加而增大.当Cu含量x=4.5时,△M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,△M大大削弱,磁场驱动性质消失.In this paper, we investigate the magnetic and martensitic transformation properties of Cu doping partial Ni in NisoMnarIn14 alloy. It is found that the critical temperature of the martensitic transformation decreases with Cu concentratiop χ in Ni50-χCuχMna6In14 increases. While Cu concentration is less than 5% at., the magnetization of anstenite phase is stronger than ~hat of martensite phase, and AM of magnetization martensite and austenite increases with CU doping. AM increases rapidly to 80 emu/g when χ= 4.5 and a field- induced transformation is observed in this alloy, predicting the opplication potential as the magnetic actuation and magnetoresistance materials. As Cu content increases to χ 〉5, the magnetization of austenite becomes weaker than that of martnensite,⊿M decreases to near zero.

关 键 词：磁性形状记忆合金 磁驱动马氏体相变 NiCuMnIn 

分 类 号：TG139.6[一般工业技术—材料科学与工程]