Joining of Metal-Matrix Composite by High Energy Beam Assisted In-Situ Formation

本项目旨在开发一种利用激光等高能光束辅助的原位成形技术来连接金属基复合材料的新工艺。主要结论如下：1.研制了带送粉器的高能束流拼接装置。采用高能束辐照熔化金属基复合材料沟槽表面，通过高能束流将铝合金和陶瓷混合粉末注入沟槽中，形成金属基复合材料的沉积并填充沟槽。这样，金属基复合板就完全连接起来了。对商业化的6061/Al_2O_3/10%铝基复合材料板材(6061铝合金，体积分数为10%的Al_2O_3颗粒)进行了新型连接工艺的可行性试验，并对连接参数进行了研究。通过宏观和微观金相分析，揭示了Al_2O_3颗粒在接合区的分布。研究了高能电子束熔化镁合金的特性，为进一步的研究奠定了基础。

This project has been intended to develop a new joining process of metal-matrix composite by using in-situ formation technique assisted by high energy beam, such as laser beam. Main conclusions obtained are as follows,1. High energy beam joining apparatus equipped with powder feeder was developed. Groove surface of metal-matrix composite was melted by high energy beam irradiation and mixed powders with aluminum alloy and ceramics were injected into the groove through high energy beam, and then the deposition of metal-matrix composite was formed and filled the groove. Thus, metal-matrix composite plate was completely joined.2. Feasibility test of this new joining process was done to commercially available metal-matrix composite plate, 6061/Al2O3/10%, which was a 6061 aluminum alloy matrix with 10 volume % Al2O3 particles dispersed and joining parametric study to obtained a good joining was carried out.3. Macro and microscopic metallurgical studies were done to reveal the distribution of Al2O3 particles in the joining zone.4. Melting characteristics of magnesium alloy by high energy beam was investigated for the further study.