Abstract: Graphene nanosheets (GNPs) reinforced AZ91 alloy matrix composite was fabricated by a casting method. The mechanical properties of the composite were tested. The microstructure, interfacial bonding structure and fractographs of the as-cast composite were characterized and analyzed via optical microscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) equipped with energy-dispersive spectrometer (EDS). The strengthening mechanism of GNPs/AZ91 composite was discussed in detail. The results showed that GNPs can effectively refine the grain sized of AZ91 alloy. The yield strength, elongation and microhardness of AZ91-0.1GNPs composite was (164±5) MPa,(7.7±0.1)% and (74.2±2)HV, increasing by 37.8%,13.2% and 24.7%, respectively, compared to that of as-cast AZ91 alloy. A strong interfacial bonding between GNPs and the matrix of α-Mg have been formed, which is beneficial to the fine-grain strengthening, stress transfer strengthening and so on, resulting in a significant improvement in the tensile strength, ductility and other mechanical properties of magnesium alloy.
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2018, Vol. 32 
