摘要
采用差热分析和X射线衍射及透射电子显微分析,研究了Ni50Mn29Ga21Tb1.2形状记忆合金的马氏体转变温度、室温下的马氏体的结构及亚结构。结果表明:Ni50Mn29Ga21Tb1.2室温下以体心四方结构的五层马氏体为主,其晶格常数为:a=b=0.60nm,c=0.5546nm;在某一微小区域内有体心斜方结构的七层马氏体,其晶格常数为:a=0.616nm,b=0.581nm,c=0.553nm,β=90.8°;Ni50Mn29Ga21Tb1.2室温下的亚结构为孪晶。
Martensitic transformations, martensitic struc- tures and substructures of Ni50Mn29Ga21Tb1.2 shape memory alloy were studied by DTA, X-ray diffraction and electron diffraction. The results show that the main phase at room temperature are body-centred tetragonal structure with the lattice parameters： a =b = 0.60 nm, c = 0.5546 nm; body-centred monoclinic with lattice parameters： a =0.616nm, b =0.581 nm, c =0.553 nm, β= 90.8° in some tiny area. The substructures of Ni50Mn29Ga21Tb1.2 at room temperature are twins.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2006年第2期251-253,共3页
Journal of the Chinese Society of Rare Earths
基金
中国与波兰政府间科技合作项目(31-10A)
内蒙古自然科学基金资助项目(200308020214)
关键词
形状记忆合金
晶体结构
孪晶
稀土
shape memory alloy
crystal structure
twin
rare earths
