( 1. 清华大学 机械工程系， 北京 100084;
2. 西北工业大学 凝固技术国家重点实验室， 西安 710072)
摘 要: 研究了具有枝晶组织的Al-5.8%Cu合金在控制熔化过程中固相形态的演变， 以及加热速率、保温时间对固相形态演变的影响。 分析了影响熔化组织中固相形态的因素， 提出由枝晶组织直接获得适合半固态成形的球晶组织的控制熔化工艺， 并制备了固相颗粒圆整、 尺寸较小、分布均匀的半固态浆料。
关键字: 控制熔化；半固态； 组织演变
semi-solid slurry by controlled melting
（ 1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. State Key Laboratory of Solidification Process,
Northwestern Polytechnical University, Xi'an 710072, China）
Abstract: The microstructure evolution of a dendritic Al-5.8%Cu alloy during controlled heating and re-melting process was investigated. Attention has been paid to the effects of heating rate and holding time on the morphology changing of solid grains during re-melting. Based on the analysis of the factors influencing morphology of the melting grains, a new method to prepare semi-solid slurry by controlling as-cast microstructure and melting process was proposed. And a semi-solid slurry was successfully obtained by using the new method.
Key words: controlled melting; semi-solid; microstructure evolution
