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价电子浓度和晶格体积是影响Heusler合金马氏体相变温度的两个主要因素.为了研究Ni-Mn基Heusler合金马氏体相变温度的变化规律,我们利用第三主族元素Al,Ga,In分别对Ni44Mn45Sn11合金中的Sn进行替代研究.实验结果表明:Al,Ga和In与Sn相比具有较少的价电子和较小的离子半径,替代导致合金价电子浓度降低和晶格体积收缩,但马氏体相变温度并不随着价电子浓度和晶格体积单调地上升或下降,价电子浓度和晶格尺寸机制均不能独立地解释Ni44Mn45Sn10R(R=Al,Ga,In和Sn)合金中的马氏体相变温度变化规律.综合价电子浓度和晶格尺寸因素,我们提出用电子密度可很好地解释Ni-Mn基铁磁形状记忆合金体系中马氏体相变温度随着电子密度的升高而升高的变化规律.
Valence electron concentration and lattice volume are the two main factors affecting the martensitic transformation temperature of Heusler alloy.In order to study the martensitic transformation temperature of Ni-Mn-based Heusler alloy, we use the third main group elements Al, Ga and In respectively replace Sn in Ni44Mn45Sn11 alloy.The experimental results show that Al, Ga and In have less valence electrons and smaller ionic radii than Sn, which leads to the decrease of valence electron concentration and lattice But the martensitic transformation temperature does not monotonically increase or decrease with the valence electron concentration and the lattice volume. Both the valence electron concentration and the lattice size mechanism can not independently explain Ni44Mn45Sn10R (R = Al, Ga, In and Sn ) Alloy martensitic transformation temperature variation law.Based on the valence electron concentration and lattice size, we propose that the electron density can be a good explanation of Ni-Mn-based ferromagnetic shape memory alloy martensitic transformation temperature With the increase of electron density and the rising law of change.