Cross-scale heterogeneous strengthening phase synergistically enhanced high-entropy alloy composite material

Abstract

The invention discloses a cross-scale heterogeneous strengthening phase synergistically enhanced high-entropy alloy composite material, and belongs to the technical field of composite materials. According to the composite material, a CoCrFeNi high-entropy alloy is used as a matrix, and micron-sized NbMoTaWV refractory high-entropy alloy particles and nano-sized Y2O3 particles are used as strengthening phases. Uniform mixing of micron-scale composite powder and uniform coating of nano-scale Y2O3 particles are achieved through an acoustic resonance mixing technology, and then forming is conducted through a laser powder bed melting technology (LPBF). The micron-sized strengthening phase is embedded into the matrix through the LPBF technology, the micron-sized strengthening phase and the matrix form a firm metallurgical bonding element diffusion layer, and meanwhile the nano-sized strengthening phase is dispersed and distributed to achieve the synergistic effect of the cross-scale strengthening phase. Through synergistic strengthening of cross-scale heterogeneous strengthening phases, the room-temperature and high-temperature tensile properties of a high-entropy alloy matrix are remarkably improved while the high compactness of the material is guaranteed.

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