Author Affiliations
1Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, Shanxi, China2School of Materials Science and Engineering, North University of China, Taiyuan 030051, Shanxi, China3Shanxi Key Laboratory of Controlled Metal Solidification and Precision Manufacturing, Taiyuan 030051, Shanxi, Chinashow less
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
Element | Mass fraction /% |
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Si | 10 | Mg | 0.45 | Cu | 0.1 | Ni | 0.05 | Fe | 0.55 | Mn | 0.45 | Ti | 0.15 | Sn | 0.05 | Pb | 0.05 | Al | Margin |
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Table 1. Chemical composition of AlSi10Mg powder
Process parameter | Content |
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Laser power /W | 300 | Exposure time /μs | 140 | Spot size /μm | 70 | Layer thickness /μm | 30 | Point distance | 0.3 | Atmosphere | Argon |
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Table 2. Selective laser melting process parameters
Material | Yield strength σ0.2 /MPa | Ultimate tensile strength /MPa | Elongation /% |
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AlSi10Mg | 241±3 | 383±4 | 9.8±0.21 | 0.1%GNPs/AlSi10Mg | 254±5 | 417±4 | 8.4±0.14 | 0.3%GNPs/AlSi10Mg | 243±3 | 370±5 | 7.3±0.32 | 0.5%GNPs/AlSi10Mg | 150±3 | 224±6 | 4.0±0.45 |
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Table 3. Tensile properties of AlSi10Mg alloy and GNPs/AlSi10Mg composites
Element | Atomic fraction /% |
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Point A | Point B | Point C | Point D |
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C | 72.56 | 66.31 | 65.82 | 39.82 | Al | 23.39 | 29.85 | 30.28 | 49.40 | Mg | 0.11 | 0.29 | 0.33 | 0.60 | Si | 3.94 | 3.55 | 3.56 | 10.18 |
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Table 4. EDS analysis of different locations in the composites showed in Fig.9