HEA@RGO synergistically reinforced Al6061 composites: Interface reaction of in-situ formed Al9Cr3Si diffusion layer, mechanical properties and deformation mechanism

HD Wang and HW Zhao and Y Wang and N Guo and K Wang and H Liu and ZN Li and YP Wei, JOURNAL OF ALLOYS AND COMPOUNDS, 1045, 184703 (2025).

DOI: 10.1016/j.jallcom.2025.184703

In this study, Al6061-based metal matrix composites (MMCs) were fabricated via hot-pressing sintering combined with hot extrusion technology, with the incorporation of high-entropy alloy modified reduced graphene oxide (HEA@RGO) at different mass fractions (0.1 wt%, 0.2 wt%, and 0.3 wt%). Transmission electron microscopy (TEM) observations revealed that the interfaces between HEA, RGO and Al are well-bonded without cracks or micropores, and an Al9Cr3Si diffusion layer is formed in situ at the HEA/Al interface. When the addition amount of HEA@RGO is 0.1 wt%, the tensile strength and yield strength of the composite are increased by 41.3 % and 51.6 % respectively, while the elongation is maintained at 12.06 %. Analysis of the strengthening mechanism indicates that the enhanced performance of Al6061-based MMCs is attributed to grain refinement and the hindering effect of HEA@RGO on dislocation motion.

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