In-situ synthesized Al matrix composites (AMCs) have drawn lots of interest recently relying on the designability of reinforcement configurations and promising mechanical properties. In this work, a new generation of AMCs reinforced by in-situ MgAl₂O₄ particles was fabricated based on Al-Mg-ZnO system using shift-speed ball-milling (SSBM) combined with reactive sintering method. The detailed microstructural characterization and comprehensive thermodynamic analysis rationalized the in-situ reaction mechanism, in which the substituted MgO was involved in the formation of homogeneously dispersed MgAl₂O₄ that forms robust interfacial bonding with matrix. In addition, the coefficient of thermal expansion mismatch strengthening and grain refinement acted in concert to render the impressive mechanical properties, achieving the yield stress of 347 MPa and ultimate tensile stress of 505 MPa. This work can be informative for the fabrication of high-performance in-situ MgAl₂O₄ reinforced AMCs based on Al-Mg-oxides system.

原位合成的铝基复合材料（AMC）最近因增强配置的可设计性和有前途的机械性能而引起了很多兴趣。在这项工作中，基于Al-Mg-ZnO体系，使用变速球磨（SSBM）结合反应烧结法制备了由原位MgAl ₂ O ₄颗粒增强的新一代AMC 。详细的微观结构表征和全面的热力学分析使原位反应机制合理化，其中取代的 MgO 参与形成均匀分散的 MgAl ₂ O ₄与基质形成牢固的界面结合。此外，热膨胀系数失配强化和晶粒细化协同作用，呈现出令人印象深刻的机械性能，实现了 347 MPa 的屈服应力和 505 MPa 的极限拉伸应力。这项工作可为基于 Al-Mg-氧化物体系的高性能原位 MgAl ₂ O ₄增强 AMC的制造提供信息。