铜/钢爆炸复合板浸铝铸件的界面组织

Al-steel interfacial microstructure of casting produced by inserting explosively welded Cu-steel plate into aluminium melt

采用扫描电镜技术观察和分析了爆炸复合铜 /钢板浸铝铸件的铝 /钢界面组织 ,用面扫描探明了界面组织中主要成份的分布 ,结合粉末样品的X射线谱确定了界面组织的相组成 ,用拉剪方法测得了界面的结合强度。结果表明 :爆覆在钢板上的铜全部溶入铝液中 ,界面上出现了Fe2 Al5与FeAl3 两层连续的中间化合物 ;同时界面附近还出现了FeAl3 颗粒相 ,这种颗粒相的形成可能和浸铝用钢板的爆炸焊接组织有关。界面的结合强度为 80 .5MPa。

SEM was used to observe the microstructure of the Al-steel interface in the ingot which was produced by inserting an explosively welded Cu-steel plate into the aluminium melt. The face-scanning of elements was also applied to investigate the concentration distribution of major elements in the interfacial microstructure, and the different phases were confirmed by the means of powder XRD. It is found that the copper layer explosively welded on the steel plate dissolutes in the aluminium melt totally. There are two continuous layers in the interface: the one adjacent to the steel base is Fe_2Al_5, and another is FeAl_3. Particles near the interface in the Al base are also found and defined as FeAl_3 and its formation may be related to the explosively welded microstructure of the steel plate inserted in the aluminium melt. The bonding strength is about 80.5 MPa from tensile-shear test.