A process chain of compound casting and co-extrusion of AA7075/6060 bilayer billets is introduced to manufacture hybrid components with strength in the core and good corrosion-resistance in the shell. Using optimized compound casting parameter, metallurgical bonding between the shell AA6060 and the core AA7075 can be achieved through remelting and recrystallization of the substrate AA7075. The locally unequal thermal conditions at the interface induces partially weak bonding. The bonding strength in greater distance from the casting gate is generally lower. Hot extrusion is applied to improve the interfacial bonding. Comparisons of the microstructure and the shear strength between as-cast billet and extrudate present the homogenization of the interfacial bonding through the process chain.

引入了复合铸造和共挤AA7075 / 6060双层坯料的工艺链，以制造混合组件，该组件在芯部具有强度，在壳体中具有良好的耐腐蚀性。使用优化的复合浇铸参数，可以通过对基板AA7075进行重熔和重结晶来实现外壳AA6060与芯AA7075之间的冶金结合。界面处局部不均匀的热条件会引起部分弱粘合。在距浇铸浇口较大距离处的粘结强度通常较低。应用热挤出以改善界面结合。铸坯和挤出物之间的微观结构和剪切强度的比较表明，在整个工艺链中界面粘结均质化。