Mechanical and damping properties of the multi-layer graphenes enhanced CrMnFeCoNi high-entropy alloy composites produced by powder metallurgy

Abstract The CrMnFeCoNi-based composites with different multi-layer graphenes (MLGs) content (0 wt.%, 0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.%) were prepared by powder metallurgy. The effects of the MLGs content on the mechanical and damping properties of the composites were studied specifically. The strength and hardness are obviously improved, and the tensile strength can reach 762 MPa. With the addition of MLGs, new damping mechanisms including the intrinsic damping of graphene and the interface damping are introduced, which lead the damping properties of composites to remain at a high level. As the content of MLGs increases, the Maximum internal friction (Q-1max) of the composites increases first and then decreases, and its maximum value is 0.0667.