(1. 江苏大学 材料科学与工程学院，镇江 212013；
2. 江苏省高端结构材料重点实验室，镇江 212013)
摘 要: 在ZL109合金表面电镀Cu改善其润湿性，并用重力铸造成功制备ZL109-Al99.5和ZL109-ZL109复合铸造件。利用扫描电镜和能谱仪分析复合铸造件的显微结构和元素组成，并测试其室温硬度。结果表明：ZL109-Al99.5和ZL109-ZL109复合铸造件均具有良好的冶金结合界面，界面结合为熔合结合与扩散结合作用；ZL109-Al99.5显微硬度从Al99.5侧的30HV左右向ZL109合金侧逐步递增至85HV，而ZL109-ZL109的硬度则在界面处出现波谷，硬度为64HV左右，界面组织主要表现为α(Al)柱状晶。
关键字: ZL109合金；电镀Cu；复合铸造；界面；显微结构；硬度
（1. School of Materials Science and Engineering, Jiangsu University, Zhengjiang 212013, China;
2. Jiangsu Province Key Laboratory of High-end Structure Materials, Zhengjiang 212013, China）
Abstract:A copper layer was electroplated on the surface of ZL109 alloy to improve its wettability, and ZL109-Al99.5 and ZL109-ZL109 joints were successfully prepared by compound casting. The microstructure and composition of the compound casting joints were analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that ZL109-Al99.5 and ZL109-ZL109 compound casting joints have good metallurgical bonding interface and the interface is mainly in the form of diffusion bonding, assisting with fusion bonding. The microhardness of ZL109-Al99.5 interface layer increases from Al99.5 side to ZL109 side, while there appears a microhardness trough value at the interface of ZL109-ZL109 compound casting joint, because the interface mainly consists of α(Al) columnar crystals.
Key words: ZL109 alloy; electroplating copper; compound casting; interface; microstructure; microhardness
