Fe-Si合金系的机械合金化研究

Investigation on Mechanical Alloying of Fe-Si System

1. Departemnt of Material Science, Shanghai Jiao Tong University, 200030;
2. Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074

摘要: 采用高能行星球磨的方法研究了成分为Fe_xSi_1-x(x=0.30~0.75)的纯元素混合粉末的机械合金化过程。对球磨不同时间粉末的结构分析和组织观察表明:Fe₇₅Si₂₅粉末经球磨形成具有bcc结构的纳米晶α固溶体,此α固溶体的晶粒尺寸和晶格常数随球磨时间的延长而减少。Fe₅₀Si₅₀粉末的球磨产物为单相FeSi化合物,而Fe₃₀Si₇₀混合粉末的球磨产物为α+FeSi+β-FeSi₂三相混合结构。在研究的成分范围内无非晶化发生,对此进行了热力学分析。
- 机械合金化 /
- 纳米晶 /
- 热力学
Abstract: The process of mechannical alloying of elemental powder mixtures of Fe_xSi_1-x (X=0.30~0.75)is studied with a high energy planetary ball milling.After the structure analasis of powders at different milling time,it showed that nanocrystal αFe(Si)Solid solution(bcc)was formed during the milling of Fe₇₅si₂₅ powders,the lattice spacing and grain size of αFe(Si)decreased with increase of milling time.The milling products of Fe₅₀si₅₀ and Fe₃₀si₇₀ were FeSi compounds and three phases mixture α+FeSi+βFeSi₂,respectively.There was no amorphous product in the studying composition range and a thermodynamics analysis was perfermed.
- mechanical alloying /
- nanocrystal /
- thermodynamics