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

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.