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利用XRD和TEM方法研究Fe42.5Al42.5Ti5B10合金在机械合金化及等温热处理过程中的结构演变及晶粒生长动力学,讨论了机械合金化合成机理和热处理过程中的晶粒生长机理.结果表明,球磨过程中Al,Ti,B原子向Fe晶格中扩散,形成Fe(Al,Ti,B)固溶体.机械合金化合成Fe(Al,Ti,B)遵循连续扩散混合机理.球磨50 h后,金属Fe,Al,Ti,B已完全合金化,球磨终产物为纳米晶Fe(Al,Ti,B).球磨50h的粉体在热处理过程中除了发生晶体缺陷和应力释放等过程以外,Fe(Al,Ti,B)分解形成纳米晶B2-FeAl及TiB2组成相.根据晶粒生长动力学理论计算纳米晶FeAl的晶粒生长激活能为525.6 kJ/mol.
The structure evolution and grain growth kinetics of Fe42.5Al42.5Ti5B10 alloy during mechanical alloying and isothermal heat treatment were studied by XRD and TEM. The mechanism of mechanical alloying synthesis and grain growth during heat treatment were discussed. The results show that Al, Ti and B atoms diffuse into the Fe lattice during ball milling to form Fe (Al, Ti, B) solid solution. The mechanical alloying synthesis of Fe (Al, Ti and B) h, the Fe, Al, Ti and B metals have been completely alloyed and the final products of the ball milling are nanocrystalline Fe (Al, Ti, B). In addition to the crystal defects and stress release during the 50h milling, , Fe (Al, Ti, B) decomposed to form nanocrystalline B2-FeAl and TiB2 phase.According to the grain growth kinetics theory, the grain growth activation energy of nanocrystalline FeAl was 525.6 kJ / mol.