(1. 华北理工大学 冶金与能源学院，唐山 063210；
2. 重庆大学 材料科学与工程学院，重庆 400044)
摘 要: 利用固/液复合法将液态6061铝合金熔体包覆AZ91D镁合金半固态坯料，制备出AZ91D/6061双金属复合铸锭，分析了不同外熔体温度对界面显微组织的影响，研究了界面相的形成、元素扩散及其热力学与动力学。结果表明：复合界面主要分为三个区域，其相组成主要有Al12Mg17和Al3Mg2两相；通过计算两相的热力学和动力学参数可知，由于Al12Mg17相所需的活化能比Al3Mg2相的低，所以Al12Mg17优先于Al3Mg2生成。另外，界面反应扩散层是由界面反应和扩散反应协同控制完成。
关键字: 双金属复合材料；复合界面；原子扩散；热力学；动力学；显微组织
（1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China;
2. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China）
Abstract:Using the solid/liquid composite method, AZ91D/6061 bimetallic composite ingots were prepared by coating AZ91D magnesium alloy semi-solid billet with liquid 6061 aluminum alloy melt, and the effect of the temperature on the interface microstructure was analyzed, and the formation, the diffusion of the elements and the thermodynamics and kinetics of the interface were investigated. The results show that the composite interface is divided into three regions, which are composed of Al12Mg17 and Al3Mg2 phases. By calculation of the thermodynamics and dynamics of two phases, Al12Mg17 is less active than Al3Mg2, so Al12Mg17 is first forms before Al3Mg2. In addition, the interface reaction diffusion layer is completed by the interface reaction and diffusion reaction.
Key words: bimetallic composite; composite interface; atomic diffusion; thermodynamic; kinetic analysis; microstructure
