( 1. 清華大學(xué) 機械工程系， 北京 100084;
2. 西北工業(yè)大學(xué) 凝固技術(shù)國家重點實驗室， 西安 710072)
摘 要: 研究了具有枝晶組織的Al-5.8%Cu合金在控制熔化過程中固相形態(tài)的演變， 以及加熱速率、保溫時間對固相形態(tài)演變的影響。 分析了影響熔化組織中固相形態(tài)的因素， 提出由枝晶組織直接獲得適合半固態(tài)成形的球晶組織的控制熔化工藝， 并制備了固相顆粒圓整、 尺寸較小、分布均勻的半固態(tài)漿料。
關(guān)鍵字: 控制熔化；半固態(tài)； 組織演變
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
