摘要
用电弧炉熔炼了Ni55Fe17.5Ga27.5合金,用光学显微镜、X射线衍射仪和振动样品磁强计研究了Nb的添加对该合金组织形貌、晶体结构及磁性能的影响。结果表明,室温下,合金Ni55Fe17.5Ga27.5为14M单斜结构马氏体相与面心立方结构γ相双相共存,添加1at%的Nb对合金组织形貌和晶体结构影响不大;当添加2at%的Nb时,马氏体变体宽度明显变小;当添加3at%的Nb时,合金为马氏体相、γ相和母相奥氏体相三相共存,马氏体变体宽度进一步减小;当添加Nb含量为1at%时,合金的饱和磁化强度及居里温度都有所提高;进一步增加Nb的添加量,合金的饱和磁化强度及居里温度都呈下降趋势。
The effects of Nb addition on the microstructure and magnetic properties of Ni55Fe17.5Ga27.5ferromagnetic shape memory alloy were investigated by metallurgical microscope, X ray diffraction and vibrating sample magnetometer. The results show that Ni55Fe17.5Ga27.5alloy has two phase coexistence, such as 14 M monoclinic martensitic structure and face-centered cubic structure of γ phase at room temperature,little effect on morphology and crystal structure of the alloy with adding 1at% of Nb, when 2at% of Nb is added into the alloy. The width of martensite variant in alloy is significantly smaller.When adding 3at% of Nb, the alloy has three phase coexistence, and the martensite variant width decreases furtherly. When adding 1at% of Nb, the saturation magnetization and curie temperature of the alloy increase. When further adding Nb into the alloy, the saturation magnetization and curie temperature of the alloy decrease.
出处
《热加工工艺》
CSCD
北大核心
2014年第22期53-56,共4页
Hot Working Technology
