(西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 采用微观相场法研究铝基合金中界面错配应力对沉淀相粗化过程的影响。结果表明：界面错配应力为零时，粗化机制符合经典LSW机制；错配应力较大时，粗化机制是位向控制粗化机制，沉淀相颗粒沿弹性“软”方向规则分布；中等界面错配应力时，粗化机制为兼具位向控制和LSW机制的混合机制；界面错配应力促进沉淀相延弹性软方向生长；沉淀相的粗化过程和长大过程交叠进行。
关键字: 铝合金；粗化机制；粗化速率；界面错配应力
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:Influence of interface mismatch stress on precipitate coarsening process in aluminum alloys was investigated using a microscopic phase-field model. The results show that, when the interface mismatch stress is zero, the coarsening mechanism complies with the classic LSW theory. When the mismatch stress is large, the coarsening mechanism is orientation-controlled. The precipitate particles are distributed periodically along the elastic soft directions. At medium interface mismatch stress, the coarsening mechanism is mixed with both orientation-control and LSW mechanism. The interface mismatch stress promotes precipitate growing in elastic soft directions. The coarsening process and growth process of the precipitates overlap with each other in proceeding.
Key words: aluminum alloy; coarsening mechanism; coarsening rate; interfacial mismatch stress
