摘要
利用差热扫描量热仪 ( DSC)及透射电子显微镜 ( TEM)研究了 Zn- Al40合金过饱和固溶体 α′s在连续加热及等温时效过程中的不连续分解。结果表明 :过饱和固溶体 α′s在连续加热及等温时效过程中将发生分解 ,并通过不连续分解机制形成胞状组织 ,其反应激活能为 78.79k J/mol。锌的扩散速度决定过饱和固溶体 α′s的胞状分解速度 ,且胞状组织的生长受晶界扩散控制。胞状组织在生长过程中发生晶界迁移 ,最终形成 α- η- Zn片层相间的组织。
The cellular decomposition of supersaturated solid solution α′ s in Zn A140 alloy was studies by Differental Scanning Calorimetry (DSC) and Transmission Electron Microscopy (TEM) The results show that α′ s would decompose to form the cellular structure by discontinuous decomposition mechanism The activation energy for decomposition of α′ s is 78 79kJ/mol The diffusion of zinc is the rate determining process for decomposition of α′ s and the growth of the cellular colonies is controlled by boundary diffusion The migration of the boundary occurred during the growth of the cellular colonies and the lamella equilibrium structure (α+η) would form at last
出处
《机械工程材料》
CAS
CSCD
北大核心
2001年第2期21-22,25,共3页
Materials For Mechanical Engineering
