摘要
采用真空感应熔炼法制备了多晶Ni52 Mn2 4 4 Ga2 3 6 合金 ,用粉末压缩压制的方法制作粘结Ni52Mn2 4 4 Ga2 3 6 磁体 ;通过显微组织观察和差热分析 (DSC)的方法研究了不同的浇铸方式和退火工艺对多晶Ni52 Mn2 4 4 Ga2 3 6 合金铸锭组织和性能的影响。结果表明 ,缓慢冷却的合金液能得到晶粒粗大的合金铸锭 ;两步退火工艺能使合金铸锭具有确定的马氏体转变点 ,并促进马氏体变体的形核和长大。
Polycrystalline alloy Ni52Mn24.4Ga23.6 was prepared by repeated vacuum induction melting, and bonded Ni52Mn24.4Ga23.6 magnets were prepared by powder compression method. The effects of different moulding and annealing processes on the microstructure and properties of Ni52Mn24.4Ga23.6 alloy were investigated by differential scanning calorimetry (DSC) analysis, optical microscopy and scanning microscope. The results show that coarse grains can be obtained at low cooling rate. The fixed martensite transformation temperature of the alloy is obtained and the nucleation and growth of martensite of Ni52 Mn24.4Ga23.6 alloy is promoted by two-step annealing process.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第1期10-13,共4页
Transactions of Materials and Heat Treatment
基金
湖南省自然科学基金资助项目 (0 2JJY2 0 82 )
关键词
粘结Ni52Mn24.4Ga23.6磁体
热处理
冷却速度
退火
Annealing
Gallium alloys
Heat treatment
Manganese alloys
Martensitic transformations
Nickel alloys
Polycrystalline materials
Shape memory effect
