加介质球磨Fe-Ni粉末的相结构

Phase Constitution of Ball-Milling Fe-Ni Powders with Alcohol

在加乙醇作为介质球磨(湿磨)条件下,采用6∶1的球料比,240r/min的转速,球磨x(Fe)∶x(Ni)=(100-y):y(原子百分数,y=32,36,50,79)粉末,采用X射线衍射分析方法,研究了球磨产物的相结构变化、晶粒尺寸变化及晶格常数的变化·发现了x(Fe)∶x(Ni)=64∶36粉末在加乙醇介质球磨条件下,Fe在fcc相中的含量随球磨时间的增加先增后减这一新现象,且在整个过程中伴随着晶格常数和晶粒尺寸的变化;对于相同球磨时间不同成分配比的Fe Ni混合粉末,随着粉末中Ni含量的增加,bcc相晶格常数减小,fcc相的晶格常数增大,fcc相中Fe的含量增加,晶粒尺寸减小·

The phase constitution and grain size of ballmilling FeNi powders with alcohol as well as the lattice parameter evolution were investigated by Xray diffraction. The condition of ballmilling was taken as follow: the weight ratio of ball to powder is 6∶1, and the revolving velocity is 240?r/min. It is shown that the Fe concentration in the Ni fcc phase increases with increasing the ballmilling time. The fcc solid solution γ(FeNi) is formed after milling 12?h. The αFe is separated out gradually from the γ(FeNi) phase above milling 18?h. The fcc γ phase becomes pure again Ni after milling 48?h. With further increasing the milling time, the lattice parameter of the αFe phase decreases. With increasing Ni atom fraction in the FeNi mixture meanwhile that of fcc phase increases.