论文部分内容阅读
研究了Ｆｅ、Ｎｉ粉末在氢气保护下的机械合金化过程。利用ＸＲＤ和ＳＥＭ研究了球磨过程粉体的显微组织结构，测量了不同球磨时间粉体的显微硬度。结果表明，经３ｈ球磨便实现了Ｆｅ－Ｎｉ的完全合金化，合金的组织结构为纳米晶超饱和α固溶体（ｂｃｃ）和γ固溶体（ｆｃｃ）两相混合组织。继续球磨，过饱和α相逐渐分解并向γ相转化。根据衍射图分析了球磨过程的微观应变和晶粒尺寸及其对粉末显微硬度的影响。
The mechanical alloying process of Fe and Ni powders under the protection of hydrogen was studied. The microstructure of the powders during ball milling was studied by XRD and SEM, and the microhardness of the powders at different ball milling time was measured. The results show that the complete alloying of Fe-Ni can be achieved by 3h ball milling. The microstructures of the alloy are nanocrystalline supersaturated α solid solution (bcc) and γ solid solution (fcc) two-phase mixed microstructure. Continue milling, supersaturated α phase gradually decomposed and transformed to γ phase. According to the diffraction pattern, the microscopic strain and grain size of the ball milling process and its effect on the microhardness of the powder were analyzed.