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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 use of flux QJ207 on the solid aluminum alloy surface treatment, which can effectively remove the oxide film on the aluminum alloy surface to improve the wettability of Mg-Al liquid-solid composite, to improve the combination of the two. At the same time, the content of Si in the solid state aluminum substrate was changed and the liquid-solid mixture of Mg-Al was carried out to obtain Mg-Al bimetal samples with different Si content. Through the metallographic observation of the interface microstructure, SEM scanning and energy spectrum analysis, it was found that with the increase of Si content, Mg_2Si particles were formed in the transitional layer. When Si content reaches 5.5%, Mg_2Si particles join with each other to form Mg_2Si layer. Mg_2Si layer approaches to the bonding surface with the further increase of Si content. When Si content reaches 12.5%, Mg_2Si layer moves down to the bonding surface, The generation of Mg-Al intermetallic compounds, the mechanical properties of the alloy is improved.