Fig. 1. Morphology of raw materials. (a) Morphology of AlSi10Mg powder captured by scanning electron microscope (SEM);(b) morphology of GNPs captured by SEM

Fig. 2. Morphology and composition analysis of GNPs/AlSi10Mg composite powders. (a) SEM morphology of 0.1%GNPs/AlSi10Mg; (b) carbon element distribution map of 0.1%GNPs/AlSi10Mg; (c) SEM morphology of 0.3%GNPs/AlSi10Mg; (d) composition analysis of 0.3%GNPs/AlSi10Mg; (e) SEM morphology of 0.5%GNPs/AlSi10Mg; (f) composition analysis of 0.5%GNPs/AlSi10Mg

Fig. 3. Size of tensile specimen. (a) Schematic diagram; (b) physical image

Fig. 4. EBSD inverse pole figure (IPF) maps, distributions of the grain size and the pole figures (PFs) of AlSi10Mg alloy and 0.5%GNPs/AlSi10Mg composite. (a)(c) AlSi10Mg alloy; (b)(d) 0.5%GNPs/AlSi10Mg composite

Fig. 5. Grain boundary misorientation difference distribution images and proportion diagrams of HAGB of AlSi10Mg alloy and 0.5%GNPs/AlSi10Mg composite. (a)(c) AlSi10Mg alloy; (b)(d) 0.5%GNPs/AlSi10Mg composite

Fig. 6. Cross-sectional SEM morphology of GNPs/AlSi10Mg composites. (a)(b) AlSi10Mg alloy; (c)(d) 0.1%GNPs/AlSi10Mg composite; (e)(f) 0.3%GNPs/AlSi10Mg composite; (g)(h) 0.5%GNPs/AlSi10Mg composite

Fig. 7. X-ray diffraction patterns and hardness histogram of AlSi10Mg alloy and GNPs/AlSi10Mg composites. (a) X-ray diffraction patterns; (b) hardness histogram

Fig. 8. Tensile properties of AlSi10Mg alloy and GNPs/AlSi10Mg composites. (a) Stress-strain curves; (b) tensile properties

Fig. 9. Fracture morphology of AlSi10Mg alloy and GNPs/AlSi10Mg composites

Fig. 10. Relationship between ultimate tensile strength and ductility

Fig. 11. Schematic diagrams of the strengthening mechanism of graphene. (a) Before tensile experiment; (b) after tensile experiment