Microstructure and anti-wear properties of graphene-reinforced aluminum matrix composites
The graphene-reinforced aluminum matrix composites were prepared by mechanical stir casting,and the effects of different graphene contents on the microstructure,mechanical properties and wear resistance of the composites were systematically investigated.The results show that the refinement of the α-Al phase in the composites is obvious with the increase of graphene addition and the best effect is achieved at the 1.0%addition of graphene.However,the graphene agglomeration is observed in the composites when the gra-phene addition is further increased to 1.5%.When the graphene addition is 1.0%,the mechanical properties of the composites are best,the hardness increases from HV 95 to HV 130.In addition,the yield and tensile strengths of the composites(201 MPa,254 MPa)are 68.9%and25.7%higher than those of the matrix(119 MPa,201 MPa),respectively.In the wear experiments,it is found that the com-posite with 1.0%graphene addition has the lowest wear rate and the best wear surface morphology compared to the other composites.
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