In the study, a roughened interface is designed to achieve the strength-ductility synergy of Al₂O₃/Al composites fabricated by flake powder metallurgy. The roughened SiO₂@Al₂O₃ platelets are fabricated by high-shear dispersion process and subsequent sintering at the high temperature. The results show that different morphologies of asperities on the surface of SiO₂@Al₂O₃ platelets can be obtained via controlling the sintering time. As the roughness increases, the strength and ductility of SiO₂@Al₂O₃/Al composites are simultaneously improved. Load transfer efficiency is enhanced by platelet-matrix interlocking at the roughened SiO₂@Al₂O₃/Al interface, compared to Al₂O₃/Al composite with smooth Al₂O₃–Al interface. The improved tensile ductility in SiO₂@Al₂O₃/Al composite is attributed to the extrinsic toughening mechanism. This design strategy offers a simple and promising approach to improve the mechanical properties of metal matrix composites.

在研究中，设计粗糙界面以实现片状粉末冶金制备的Al ₂ O ₃ /Al 复合材料的强度-延展性协同作用。粗糙化的 SiO ₂ @Al ₂ O ₃薄片是通过高剪切分散工艺和随后的高温烧结制成的。结果表明，通过控制烧结时间，可以获得不同形态的SiO ₂ @Al ₂ O ₃片晶表面凹凸不平。随着粗糙度的增加，SiO ₂ @Al ₂ O ₃的强度和延展性/Al复合材料同时得到改进。与具有光滑 Al ₂ O ₃ -Al 界面的Al ₂ O ₃ /Al 复合材料相比，在粗糙的 SiO ₂ @Al ₂ O ₃ /Al 界面处的薄片-基质互锁提高了负载转移效率。SiO ₂ @Al ₂ O ₃ /Al 复合材料的拉伸延展性提高归因于外在增韧机制。这种设计策略提供了一种简单而有前途的方法来改善金属基复合材料的机械性能。