High-entropy alloy particle reinforced Al-based amorphous alloy composite with ultrahigh strength prepared by spark plasma sintering

Highlights: • The high-entropy alloy particles reinforced amorphous alloy composite was prepared. • The composite exhibits outstanding yield strength3120 ± 80 MPa. • There is an interdiffusion layer between the HEA particle and the matrix. • The propagation of microcracks could keep stable within the interdiffusion layer. An Al_0.6CoCrFeNi high-entropy alloy (HEA) particle reinforced Al₆₅Cu_16.5Ti_18.5 amorphous alloy composite was prepared by spark plasma sintering (SPS). There is an interdiffusion (ID) layer between the HEA particle and the matrix. The yield strength of the composite is as high as 3120 ± 80 MPa, which was attributed to the combined action of the stable propagation of cracks, the significant increase of fracture surface energy, and the relative low content of sintering defects in the matrix.