摘要：利用机械合金化法制备电动汽车电机用Fe-Si-Al合金磁粉;采用X射线衍射分析和扫描电子显微镜分别表征机械合金化过程中合金粉体的相结构和形貌,采用热分析对合金粉体的稳定性进行分析。结果表明:按照(FeSi)₇₅Al₂₅的原子比进行配料合金粉体,球磨10 h生成纳米晶α-Fe(Al,Si)固溶体,为体心立方晶体结构,粒径为1~20μm;球磨15 h,颗粒不断细化,晶粒粒径可达30 nm;(FeSi)₇₅Al₂₅磁粉在机械合金化过程中形成了具有典型层状结构且表面各种元素均匀分布的合金粉末包覆薄膜,无非晶相生成。

关键词：机械合金化；Fe-Si-Al 合金粉；微观结构

Abstract：Fe-Si-Al alloy magnetic powders used in electric vehicle motors were prepared by mechanical alloying method. The phase structure and morphology of the powders were characterized by X ray diffraction and scanning electron microscopy, their stability was studied by differential thermal analysis. The results show that the mixture powders with atom ratio of (FeSi)₇₅Al₂₅ are milled for 10 h, the nano-crystalline α-Fe(Si,Al) solid solution generates, whose crystal structure is body-centered cubic, their particle size is in range of 1 to 20 μm. The crystal grain size reduces to 30 nm after ball milling for 15 h. During the process of mechanical alloying, the typical layered structure on the surface of (FeSi)₇₅Al₂₅ particles becomes clearly, and different elements distribute uniformly. No amorphous phase creates in the process of mechanical alloying.

Keywords: mechanical alloying；Fe-Si-Al alloy powders；microstructure