Microstructure, Texture, and Mechanical Properties of 0.4GNPs–Mg–8Al–1Sm Composites Prepared by Pulse Current‐Assisted Multidirectional Forging

Abstract

The present study investigates the evolution of the microstructure and texture of a hot‐pressed sintered 0.4GNPs–Mg–8Al–1Sm (mass fraction, %) composite material during a pulsed current‐assisted multidirectional forging process. Additionally, this study explores the use of the pulse current‐assisted multidirectional forging mechanism for strengthening the mechanical properties of composite materials. The results indicate that as the cumulative strain (ΣΔε) increases, the amount of Mg17Al12 and Al2Sm gradually increases while their size decreases. Furthermore, the fraction of the recrystallization area increases. The recrystallization mechanism is dominated by continuous dynamic recrystallization and discontinuous dynamic recrystallization. The refinement of the alloy grain size is attributed to dynamic recrystallization. Specifically, at ΣΔε = 3.15, the compressive strength and fracture strain of the multidirectional forged 0.4GNPs–Mg–8Al–1Sm composite reach 461.5 MPa and 18.8%, respectively. By quantitatively analyzing the strengthening mechanism of the alloy, it is determined that fine‐grain strengthening is the most significant mechanism contributing to the strength of the 0.4GNPs–Mg–8Al–1Sm composite.