Microstructure and damping capacity of 7075 aluminum matrix composite enhanced by 6061 aluminum particles layer

The 6061p/7075 aluminum matrix (6061p/7075Al) composite with particles layer structure was prepared by hot rolling to improve the damping capacity of 7075 aluminum alloy. The microstructure of 6061p/7075Al layered composites was analyzed by OM, SEM, EDS and XRD, the mechanical properties and damping behavior of the 6061p/7075Al layered composites were analyzed by universal mechanical testing machine and dynamic thermo-mechanical analyzer respectively. The results show that there are a large number of interparticle interfaces and micro-pores in the 6061 aluminum particles layer, and the interface between the 6061 aluminum particles layer and the 7075 aluminum matrix is well combined without interface reaction. The internal friction of 6061p/7075Al layered composites and matrix material increases with the increase of temperature and strain variables, respectively. The damping capacity of the 6061p/7075Al layered composites is obviously better than that of 7075 aluminum matrix. At 360℃, the internal friction of 6061p/7075Al layered composites is as high as 0.117, which 140% higher than that of 7075 aluminum matrix. The storage modulus of 6061p/7075Al layered composites and matrix material decreases with the increase of temperature and strain variables, respectively. At 30℃, the storage modulus of the 6061p/7075Al layered composites is 38601 MPa, which 16% higher than that of 7075 aluminum matrix.