【摘要】 用机械合金化法制备Al65Fe25Ni10纳米合金粉末。采用X射线衍射(XRD)、振动样品磁强计(VSM)研究了其结构和磁性随球磨时间的演变。结果表明:在球磨初期,粉末晶粒尺寸急剧减小,内应变迅速增大;球磨50h后晶粒尺寸、内应变基本保持稳定。矫顽力(Hc)随球磨时间的增加先增大,球磨50h后急剧减小。在晶粒尺寸较小时,矫顽力与晶粒尺寸的六次方成正比;晶粒尺寸较大时,矫顽力与晶粒尺寸成反比。更多还原

【Abstract】 The nano Al65Fe25Ni10 alloy was prepared by mechanical alloying. The evolutions of the microstructure and magnetic properties of the mixture powder with different milling time were investigated by XRD and VSM. The results indicate that the crystalline size decreases sharply,while the inner strain increases rapidly at the early stage of milling. There is no obvious change of inner strain and crystalline size with the increase of milling time after 50 h. The coercivity of the as-milled powders increases firstly but then decreases with the increase of milling time. The coercivity is proportional to the D6 as the grain size is very small; however,it is proportional to the reverse of grain size when the crystalline size increases.更多还原