Mechanical and damping properties of heterogeneous laminated structure MnCu/CuGr composites

Based on the fact that heterostructure materials can solve the problem of strength-plasticity inversion of conventional materials, in the present study, heterogeneous laminated structure (HLS) Mn40Cu/CuxGr (x = 0, 0.5, 1.0, 1.5 wt%) composites with different graphene (Gr) contents were prepared by layer stacking process and powder metallurgy process. The mechanical and damping properties of the prepared composites were synergistically optimized through strengthening mechanism of graphene as well as deformation coordination mechanism in the heterogeneous interface region. Mechanical properties of HLS composites are improved by load transfer strengthening, coefficient of thermal expansion mismatch strengthening of graphene and heterogeneous interface strengthening. The damping properties are attributed to mechanisms of dislocation damping and interface damping. HLS composite with 1.0 wt% graphene shows the best mechanical properties, the ultimate tensile strength is 313.65 MPa, the fracture strain is 0.53 %, while maintaining the high damping characteristics, and the tan δ is about 0.024 (T = 300 K, f = 1 Hz). This work provides research ideas for the realization of structure-function integrated metal matrix composites.