Ameliorating the Strength-Modulus Synergy in GNPs Reinforced Mg-Zn-Zr Composites via Multidirectional Forging and Hot Extrusion Deformation

doi:10.1007/s40195-023-01645-1

Abstract

Abstract:

The integration of lightweight and high-modulus magnesium-based materials is becoming increasingly valued as structural materials due to the complexity and intelligence of industrial products like automobiles and electronics. In this study, the graphene nanoplatelets (GNPs)/Mg-Zn-Zr composites with 0.5 wt% GNPs were successfully prepared by the combination of multidirectional forging (MDF) and hot extrusion (Ex). The newly-developed composites after multi-step deformation possessed excellent strength and modulus, with a tensile strength exceeding 375 MPa and an elastic modulus reaching 54 GPa. The results revealed that the stripping and thinning of GNPs bands parallel to the extrusion direction occurred after MDF + Ex, which promoted the dynamic recrystallization and the formation of numerous fine grains. The significant improvement in comprehensive mechanical performances of the composites could be primarily ascribed to the refinement of grain size caused by the optimized distribution of GNPs, and efficient load transfer facilitated by the tight interface.

Key words: Magnesium matrix composites, Graphene nanoplatelets (GNPs), Multi-step deformation, Microstructure, Strength-modulus

Yuhao Chen, Kaibo Nie, Kunkun Deng, Zhilong Liu, Quanxin Shi. Ameliorating the Strength-Modulus Synergy in GNPs Reinforced Mg-Zn-Zr Composites via Multidirectional Forging and Hot Extrusion Deformation[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(3): 425-437.

Figures/Tables 12

Fig. 1 Images of GNPs/Mg-Zn-Zr composites: a raw GNPs; b pretreatment GNPs; c Raman spectrum of a and b; d OM image of as-cast composite; e SEM image of as-cast composite; f XRD pattern of as-cast composite

Fig. 2 OM and SEM images of GNPs/Mg-Zn-Zr composites after MDF: a, d 1 pass; b, e 3 passes; c, f 6 passes

Fig. 3 OM images and statistical histograms of grain size of GNPs/Mg-Zn-Zr composites after multi-step deformation: a, d, g 1MDF + Ex; b, e, h 3MDF + Ex; c, f, i 6MDF + Ex

Fig. 4 SEM images of microstructure of GNPs/Mg-Zn-Zr composites after multi-step deformation: a, d 1MDF + Ex; b, e 3MDF + Ex; c, f 6MDF + Ex

Fig. 5 XRD pattern of GNPs/Mg-Zn-Zr composites after 3MDF + Ex deformation

Fig. 6 TEM observations of microstructure of GNPs/Mg-Zn-Zr composites after MDF + Ex deformation: a, b bright field image; c SAED of GNPs; d precipitates; e map scanning; f SAED of precipitates

Fig. 7 Mechanical performance of GNPs/Mg-Zn-Zr composites after MDF: a tensile curves; b YS, UTS and EL

Fig. 8 Mechanical performance of GNPs/Mg-Zn-Zr composites after MDF + Ex: a tensile curves; b YS, UTS and E

Fig. 9 Summary of yield strength versus ultimate tensile strength of various magnesium matrix composites

Fig. 10 OM and SEM images of the evolutional microstructure of GNPs/Mg-Zn-Zr composites during extrusion: a observation position diagram; b position I; c position II; d position III; e position IV

Fig. 11 Calculation values of strengthening mechanisms in the present GNPs/Mg-Zn-Zr composite after 3MDF + Ex deformation

Fig. 12 SEM fractures of GNPs/Mg-Zn-Zr composites after MDF + Ex deformation: a, d 1MDF + Ex; b, e 3MDF + Ex; c, f 6MDF + Ex

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