In the present work, the mechanical behavior of tri-metallic 7075Al/1060Al/304 stainless steel (Al/Al/Steel) composites was systematically investigated, emphasizing the effect of the strengthening mechanism introduced by interlaminar and internal microstructures of constituent layers. The results show that the excellent interface bonding of tri-metallic Al/Al/Steel composites was achieved by the combined bonding method of roll-casting and rolling bonding, and the intermetallic compounds were effectively inhibited due to the severe deformation caused by the re-bonding process. It is found that an interfacial transition zone (ITZ) appeared at the 1060Al/Steel interface for all specimens after hot rolling bonding, and the increasing thickness of ITZ can be observed with the increasing rolling reduction. The experimental observation indicated that the ITZ was independent of the intermetallic layer, and its formation was mainly due to the plastic deformation introduced by the shear effect during rolling. Compared with the bi-metallic Al/Steel, the mechanical properties of the tri-metallic Al/Al/Steel composites were significantly improved, which was attributed to the contribution of the high-performance 7075Al with precipitation strengthening behavior according to the rule of mixture. Besides, various annealing treatments were conducted to evaluate the effect of mechanical incompatibility on the mechanical properties of tri-metallic Al/Al/Steel composites. The increasing strain gradient led to considerable dislocation pile-up near the interface of the soft 1060Al layer, inducing an extra strengthening mechanism to the tri-metallic Al/Al/Steel composites, which promoted the optimization of strength and ductility.

在目前的工作中，系统地研究了三金属 7075Al/1060Al/304 不锈钢（Al/Al/Steel）复合材料的力学行为，强调了由组成层的层间和内部微观结构引入的强化机制的影响。结果表明，采用滚铸和滚轧结合的结合方式，实现了三金属Al/Al/Steel复合材料的良好界面结合，并且由于再成型引起的剧烈变形，金属间化合物得到了有效抑制。粘合过程。结果表明，热轧结合后的所有试样在1060Al/Steel界面处均出现了界面过渡区（ITZ），并且随着压下率的增加，可以观察到ITZ的厚度增加。实验观察表明，ITZ独立于金属间化合物层，其形成主要是由于轧制过程中剪切作用引入的塑性变形。与双金属Al/Steel相比，三金属Al/Al/Steel复合材料的力学性能显着提高，这归因于高性能7075Al根据混合规则具有析出强化行为的贡献. 此外，还进行了各种退火处理以评估机械不相容性对三金属铝/铝/钢复合材料力学性能的影响。应变梯度的增加导致软 1060Al 层界面附近的大量位错堆积，