具有一级磁相变的不同系列NiMnGa合金其电子浓度对相变温度的影响

Electron Concentration Dependence of Transformation Temperature in Different NiMnGa Alloys with First Order Magnetic Transition

分析了具有一级磁相变的Ni2+x+yMn1-xGa1-y,Ni2+xMn1-xGa两个合金系列中,合金电子浓度e/a对结构和磁转变温度的影响。对于Ni2+x+yMn1-xGa1-y系列合金,随着电子浓度的增加,马氏体相变温度TM增大,居里温度TC减小,在e/a=7.68处相交,继续增加e/a,TM和TC同时减小;而对于Ni2+xMn1-xGa系列合金,随x的增加,电子浓度增加,TM增大,TC减小,在e/a=7.635处相交,x继续增大,TM和TC仍然缓慢增加。不同NiMnGa合金系列中TM,TC与合金的e/a之间不同的变化关系说明,e/a对TM和TC的影响在不同的NiMnGa合金系列中是相同的。

Composition and electron concentration dependence of transformation temperature in Ni_(2+x+y)Mn_(1-x)Ga_(1-y), Ni_(2+x)Mn_(1-x)Ga alloys with first order magnetic transition were studied. For Ni_(2+x+y)Mn_(1-x)Ga_(1-y) alloys, martensitic transformation temperature T_M increases and Curie temperature T_C decreases with the increase of electron concentration e/a, they intercept at e/a=7.68. T_M and T_C decrease when continue increasing electron concentration. While for Ni_(2+x)Mn_(1-x)Ga alloys, they cross a...