铝合金表面处理对AM60/A390液固扩散连接界面组织及性能的影响  

Effect of aluminum surface treatment on structures and properties of liquid-solid diffusion bonding interface of AM60/A390

作　　者：徐光晨[1] 陈翌庆[1] Alan LUO Anil.K.SACHDEV 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]Chemical Sciences and Materials Systems Laboratory, General Motors Research and Development Center

出　　处：《中国有色金属学报》2014年第4期855-862,共8页The Chinese Journal of Nonferrous Metals

基　　金：美国通用汽车公司合作研究项目

摘　　要：利用压铸工艺将液态镁和固态铝液-固复合是镁/铝异种材料连接的新工艺,进行铝合金表面氧化膜去除工艺的研究,并在此基础上,利用自制的液固双金属复合装置将液态镁合金AM60与处理后的固态铝合金A390进行液固复合。研究铝合金表面处理对液态AM60/固态A390液固复合工艺的影响,分析研究复合试样界面的组织和性能。结果表明:采用铝合金表面处理工艺能有效地去除A390铝合金表面的氧化膜,同时在其表面形成一层含La2O3的包覆层。包覆层一方面可保护铝合金表面,避免再次被氧化;另一方面包覆层中的La2O3又可以改善液态AM60/固态A390复合界面的组织,提高界面结合强度。AM60/A390的液固复合界面的抗剪强度最高可达78.4 MPa。经过固溶处理之后,可将强度提高到84 MPa。The die-casting is a new magnesium/aluminum dissimilar welding process via casting liquid Mg alloy onto solid Al alloy substrate. The process of removing the oxide layer on solid Al substrate surface was investigated, and on this basis, the melt magnesium alloy AM60 onto solid aluminum alloy A390 was overcastted by using home-made liquid-solid bimetal composite device. The experimental results indicate the surface treatment effectively removes the nature oxide layer on solid Al substrate surface, meanwhile, a layer containing La2O3 forms on the substrate surface. On the one hand, the coating can make aluminum alloy avoid re-oxidation. On the other hand, the La2O3 in the coating can improve the structure and the bonding strength of the interface of AM60/A390 bimetals. The optimal shear strength of diffusion bonding is achieved 60.6 MPa. After solution treatment, the shear strength increases to 84 MPa.

关 键 词：铝合金 表面氧化膜 LA2O3 AM60 A390复合 液固扩散焊接 界面组织 LA2O3 

分 类 号：TG136.3[一般工业技术—材料科学与工程]