Influence of aluminum alloy interlayer with different composition on bonding strength of high volume fraction aluminum matrix composites

Utilized the aluminum alloy as the interlayer in the 60vol.% SiC/6061Al composite material, which was bonded through the process of hot isostatic pressure. The study investigated the impact of interlayers with varying compositions on the microstructure and bonding strength of the joints. The results show that using the three kinds of interlayers can obtain composites without holes, obvious stratification, and harmful phases such as Al4C3. When the middle layer was 4047Al, the thickness of the middle layer was the smallest, and the thickness was only 70 μm. The maximum flexural strength and shear strength can reach 413 MPa and 140 MPa, respectively. The main fracture modes of the three interlayer composites were the ductile fracture of the matrix alloy and the fracture of the SiC particles. The bonding strength of the SiC particles with the aluminum alloy interface was high, which makes the SiC particles play a good bearing role.