Effect of Co on the martensitic transformation,crystal structure and magnetization of Ni_(52.5) Mn_(23.5) Ga_(24) based ferromagnetic shape memory alloys

• 来源期刊: 科学通报(英文版)
• 学科: 物理学
• 关键词: 铁磁形状记忆合金 马氏体相变 晶体结构 磁化强度 Co 真空电弧熔炼 相变温度 电子浓度
• 年，卷（期）: 2011,（8）
• 页码范围: 796-802
• 页数: 7页
• 分类号: O482.5
• 语种: 中文

摘要

Five(Ni52.5Mn23.5Ga24)100-xCox(x = 0,2,4,6,8) alloys were prepared by arc melting,and the effects of Co addition on the martensitic phase transformation,crystal structure and magnetization were investigated.The phase transformation temperatures Ms,Mf,As and Af are proportional to the content of Co in the(Ni52.5Mn23.5Ga24)100-xCox alloys,which appears to be due to the variation in the valance electron concentration.The Curie temperature is sensitive to the composition of the alloy.As the amount of Co changes,both the Co-Mn exchange interaction and the distance between Mn atoms change.These,in turn,affect the Curie temperature and magnetization behavior of the alloy.The martensite phases in all the alloys are domained in three different orientations,the domain boundary was determined to belong to the family of {112} lattice planes.