Study on Microstructure and Damping Properties of AlSi10_P/7075 Aluminum Matrix Composites

AlSi10_P/7075 aluminum matrix composite was prepared by friction stir machining technology, and its microstructure, mechanical properties and damping behavior were studied.The results show that the AlSi10 alloy reinforcement particles are evenly distributed in the matrix of the composite and some of the reinforcement particles are broken into fine particles.There are α-Al, Si and MgZn₂ phases in aluminum matrix composite, and no interfacial reaction occurs.The maximum tensile strength of AlSi10_P/7075 aluminum matrix composites is 391 MPa, 14%lower than that of the aluminum matrix, and its fracture mode is ductile fracture.The damping performance of AlSi10_P/7075 aluminum matrix composite is better than that of 7075 aluminum matrix.At 360 ℃, the internal friction value of AlSi10_P/7075 aluminum matrix composites is 0.131, 21% higher than that of 7075 aluminum matrix, and the energy storage modulus of AlSi10_P/7075 aluminum matrix composites is lower than that of 7075 aluminum matrix.