Si含量对AM60/AlSi液固焊接界面组织性能的影响  

Effects of Si Content on Microstructure and Properties of the AM60/AlSi Liquid-Solid Interfacial Bonding

作　　者：胡焕冬 陈翌庆[1] 朱子昂[1] 刘丽华[1] 李立[1] 冯世鹏[1] 

机构地区：[1]合肥工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2017年第6期654-658,共5页Special Casting & Nonferrous Alloys

摘　　要：使用钎剂QJ207对固态铝合金表面进行处理,可有效除去铝合金表面的氧化膜,提高Mg-Al液固复合时的润湿性,改善了两者的结合效果。同时改变固态铝基板的Si含量进行Mg-Al液固复合,获得了不同Si含量基板的Mg-Al双金属试样。通过对界面组织进行金相观察,SEM扫描,能谱分析,发现随着Si含量提高,过渡层中形成了Mg_2Si颗粒。当Si含量达到5.5%时Mg_2Si颗粒相互连接形成Mg_2Si层,Mg_2Si层随着Si含量的进一步提高而向结合面靠近,当Si含量达到12.5%时,Mg_2Si层下移至焊接结合面,从而有效阻止了Mg-Al金属间化合物的产生,使得合金力学性能得到改善。The wettability and metallurgical bonding between molten Mg and Al substrates can be im proved by using the brazing flux QJ207 to remove the oxide film on the surface of Al substrates. The asprepared Mg-Al bimetallic samples with varied Si contents can be produced via adjusting the Si contents in Al substrates. The microstructure and mechanical properties of the AM60/A1Si alloy were investigated by SEM, EDS, XRD and tensile testing. The results reveal that Mg2Si can be generated in the tran- sition layer with the increase of Si content in AI substrate. When the Si content reaches 5. 5%, the MgzSi particles are connected with each other to form a Mg2Si layer, and Mg2Si layer is tended to the in- terface with Si content increase. With Sicontent of 12.5%, the MgzSilayeris transfered to theinterfacial surface to inhibit the generation of the intermetallics and the brittle phases in the transition layer effectively, so mechanical properties of the composites prepared are improved.

关 键 词：Mg-Al双金属 钎剂QJ207 SI含量 Mg2Si层 

分 类 号：TG40[金属学及工艺—焊接]