磁场对镍基Ni-Mn-Ga铁磁合金相变温度影响的热力学分析

来源期刊：有色金属科学与工程2012年第1期

论文作者：赵容兵 赵运才

文章页码：1 - 4

关键词：磁场；镍基铁磁合金；相变温度；热力学分析

Key words：magnetic field; nickel-base ferromagnetic alloy; phase transformation

摘    要：通过测量磁化曲线、电阻-温度关系和热分析等手段，研究了磁场对镍基铁磁合金试样Ni-Mn-Ga相变的影响．结果表明：在磁场作用下相变温度升高了约1.5 K，具有明显的磁场影响特征，利用马氏体相变热力学理论，研究了磁场对镍基铁磁合金化学自由能和非化学自由能与温度的变化关系，建立了其作用的数理模型，并与实验结果比较后基本吻合．

Abstract:

Abstract: Nickel-base ferromagnetic alloy Ni-Mn-Ga was investigated for phase transformation temperature affected by magnetic field by asuring magnetization curve, temperature dependence of the tance, and thermal analysis. The results show that magnetic field application can increase phase transformation temperature 1.5 K with distinctive behavioral affected by field. Meanwhile, thermodynamic theory of martensitic phase transformation is applied to study temperature dependence of the chemical free energy and non-chemic:al free energy on nickel-base ferroruagnetic alloy;a ruatheruatical model is built and agrees well with experimental result.