Abstract
In view of the respective advantages of HEA/Al and microwave heating technology, the novel fine-grained aluminum matrix composites reinforced by FeCoNi1.5CrCu high entropy alloy (HEA) were successfully prepared by microwave sintering. The effects of microwave sintering process on the microstructure, interface structure and mechanical properties of composites and the mechanism of interface formation under microwave were systematically studied. It is found that the material maintains fine, uniform and dense structure during microwave heating. An atomic diffusion layer with BCC solid solution structure is formed between HEA particles and the matrix, which bonds the matrix with the reinforcement closely. When the sintering temperature is 480 °C, the material has good strength and toughness, and the best interfacial bonding performance is obtained, the micro-nanohardness and elastic modulus at the interface reach 756.51 MPa and 66.556 GPa, respectively. This study reveals that the microwave sintering is a perfect technology for the preparation of FeCoNi1.5CrCu/Al composite.
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