磁场对Ni_(51.5)Mn_(24)Ga_(24.5)单晶马氏体相变的影响  

The magnetic field influence on martensitic phase transition in Ni_(51.5)Mn_(24)Ga_(24.5) single crystal

作　　者：李哲[1] 敬超[1] 陈继萍[1] 鲁玉明[1] 曹世勋[1] 张金仓[1] 

机构地区：[1]上海大学物理系,上海200444

出　　处：《功能材料》2007年第9期1422-1426,共5页Journal of Functional Materials

基　　金：上海市自然科学基金资助项目(06ZR14033);国家自然科学基金资助项目(10574087);国家自然科学基金资助项目(10674092)

摘　　要：分析了Ni51.5Mn24Ga24.5单晶样品在不同磁场下的马氏体相变温度和热滞后温度,并基于相界摩擦理论计算了样品在不同磁场下马氏体相变过程中相界摩擦所产生的能耗(FrH)。结果表明,对于不同磁场下相界推移所产生的能耗与实验观察到的热滞后温度变化规律基本一致,说明了相界摩擦理论较好地解释了Ni-Mn-Ga合金在外加磁场情况下相变过程中的热力学问题。The martensitic transition temperature and thermal hysteresis temperature were investigated of Ni51.5 Mn24 Ga24.5 Single crystals in various magnetic fields. Base to a boundary frication phenomenological theory, we calculated the energy consumed for phase boundary motion in this sample during martensitic transformation. It was found that the energy consumed for phase boundary motion is coincident with thermal hysteresis tempera- ture dependencies of magnetic-field . These results make clear the thermodynamics matter by using boundary frication phenomenological theory, during martensitic transformation.

关 键 词：马氏体相变 热滞 相界摩擦 

分 类 号：TG139.6[一般工业技术—材料科学与工程]