Magnetic and Superconducting Materials Section, Raja Ramanna Centre for Advanced Technology, Indore, India.
J Phys Condens Matter. 2010 Dec 8;22(48):486007. doi: 10.1088/0953-8984/22/48/486007. Epub 2010 Nov 17.
The potential shape memory alloy Ni(50)Mn(34)In(16) is studied with partial substitution of Mn with Fe and Cr to investigate the effect of such substitution on the martensitic transition in the Ni-Mn-In alloy system. The results of ac susceptibility, magnetization and electrical resistivity measurements show that while the substitution with Cr increases the martensitic transition temperature, the substitution with Fe decreases it. Possible reasons for this shift in martensitic transition are discussed. Evidence of kinetic arrest of the austenite to martensite phase transition in the Fe substituted alloys is also presented. Unlike the kinetic arrest of the austenite to martensite phase transition in the parent Ni(50)Mn(34)In(16) alloy which takes place in the presence of high external magnetic field, the kinetic arrest of the austenite to martensite phase transition in the Fe doped alloy occurs even in zero magnetic field. The Cr substituted alloys, on the other hand, show no signature of kinetic arrest of this phase transition.
研究了具有部分 Mn 被 Fe 和 Cr 取代的潜在形状记忆合金 Ni(50)Mn(34)In(16)，以研究这种取代对 Ni-Mn-In 合金系统中马氏体相变的影响。交流磁化率、磁化和电阻率测量的结果表明，Cr 的取代会增加马氏体相变温度，而 Fe 的取代则会降低其温度。对这种马氏体相变的转变原因进行了讨论。还提出了在 Fe 取代的合金中存在奥氏体向马氏体相转变的动力学阻滞的证据。与在高外磁场存在下发生的母体 Ni(50)Mn(34)In(16)合金中奥氏体向马氏体相转变的动力学阻滞不同，在 Fe 掺杂的合金中，即使在零磁场下，奥氏体向马氏体相转变的动力学阻滞也会发生。另一方面，Cr 取代的合金则没有这种相变的动力学阻滞的迹象。
