Abstract
Magnesium matrix composites reinforced with 0.3 wt.% graphene were fabricated by semi-solid isothermal treatment using various reheating conditions and hot extrusion. The microstructures of the hot-extruded AZ31/graphene composites were clearly refined, with the finest grain size (7.05 µm) achieved after reheating at 610°C for 30 min. Energy-dispersive x-ray spectroscopy analysis revealed that increasing the reheating temperature promotes diffusion of the solute elements and affects the mechanical properties of the composite. The optimal mechanical properties were achieved after reheating at 620°C for 30 min, with a yield strength of 214.82 MPa and an ultimate tensile strength of 310.79 MPa. The significant improvement in the mechanical properties of the composite was mainly attributed to the refined grain size, uniformly redistributed solute elements, addition of graphene, and close interfacial bonding.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 51704087 and 51574100) and University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (UNPYSCT-2016033).
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Yang, Z., Xu, H., Wang, Y. et al. Investigation of the Microstructure and Mechanical Properties of AZ31/Graphene Composite Fabricated by Semi-solid Isothermal Treatment and Hot Extrusion. JOM 71, 4162–4170 (2019). https://doi.org/10.1007/s11837-019-03736-w
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DOI: https://doi.org/10.1007/s11837-019-03736-w