本文旨在开发出制备复合锭坯的新技术，在新型热顶石墨环结晶器中安装冷却板，采用直接水冷半连续铸造法实现了4045／3004／4045铝合金三层复合锭的实验室制备，研究了复合锭坯的宏观形貌、微观组织，并考察了界面两侧元素分布以及铸造过程中界面附近3004合金熔体的温度分布，结果表明：在冷却板的作用下界面附近形成了一层温度分布较为均匀的固态支撑层，从而保证复合铸造过程的顺利实现，复合界面结合较好，且为一种冶金结合；由界面抗拉强度测试结果可知界面的结合强度均高于96MPa，进一步证明了两种合金的结合是一种冶金结合。
Abstract:The purpose of this article is to develop a new technology for producing composite ingot. With cooling plates mounted in the new type of hot-top graphite ring mold, three-layer composite ingot of 4045/3004/ 4045 aluminum alloys was prepared in the lab by the directchill (DC) semicontinuous casting process, and the macrostructure, microstructure, element distribution across the interface and temperature field distribution near the composite interface in 3004 alloy melt during the process of DC casting were investigated. The results show that the solid supporting layer with uniform temperature distribution is formed under the action of cooling plate in the vicinity of the interface ensuring the successful implementation of casting the composite ingot, where the two different aluminum alloys are well bonded together metallurgically. Also the tensile strength of composite interface has been measured, the bonding strength is more than 96 MPa, which means that the interface is a kind of metallurgical bonding.
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