钪,硅对Al-Mg-Cu合金时效初期微结构演化的作用  

Effect of Scandium and Silicon on Microstructural Evolution of Al-Mg-Cu Alloys

作　　者：张丽娜[1] 高英俊[1] 易杰[1] 李建勋[1] 苏义勇[1] 

机构地区：[1]广西大学物理科学与工程技术学院,广西南宁530004

出　　处：《中国稀土学报》2008年第5期661-665,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(50061001;5066001);广西科学基金项目(桂科自0832029;桂科基0342004-1;0639004)资助

摘　　要：运用蒙特卡罗方法计算模拟了加入微合金元素Sc,Si对Al-Cu-Mg合金时效初期微结构的演化过程的影响。模拟结果表明:在温度为453 K时,加入微量Si使合金的Mg原子逐步向Si原子偏聚;单独添加微量Sc以后,则抑制了合金中Cu原子的团簇化,使得Cu原子转向Mg原子偏聚;在同时添加Sc和Si的合金中出现了Sc/Cu/Si/Mg/空位团多元复合体。研究表明空位在微结构演化过程中对形成原子偏聚团起重要作用。The Monte-Carlo method was used to simulate the effect of Se and Si on mierostruetural evolution of Al-Mg-Cu alloys. The simulation results showed that Mg atoms tended to combine Si atoms to form MgSi segregation at 453 K. The addition of a small amount of Se depressed the cluster of Cu and resultedin the generation of co-clusters with Mg. The Al-Cu- Mg alloys exhibited a strong tendency to form Sc/Cu/ Si/Mg/vacancy complexes by adding both Si and Sc. The vacancy played an important role in the cluster formation during microstructural evolution of Al-Mg-Cu alloys.

关 键 词：Monte—Carlo方法 钪 硅 铝铜镁合金 稀土 

分 类 号：O614.32[理学—无机化学]