Abstract
Probing the interface is of great importance for tailoring the mechanical performance of Al matrix composites (AMCs) to achieve strength-ductility synergy. This work contributes an in-depth understanding of the in-situ interfaces integrating the Al2O3-intermixing region-Al interface structure and interfacial segregation/precipitation in Al-7 wt.% CuO (Al-7CuO) composite fabricated by solid-state reactive sintering. It was elucidated that the Al2O3-Al intermixing region would enhance the cohesion and plastic stability of the interface. Meanwhile, Cu segregation and CuAl2 precipitation turn to suppress dislocation nucleation/movement and increase the interfacial slippage resistance of the interface. Further characterization of the fracture morphology suggests that the robust in-situ interface exerts prominent contribution to the remarkable mechanical properties of Al-7CuO composite through effective load-transfer and changed crack propagation path.
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