【摘 要】
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Due to the high specific surface area of graphene,the effective incorporation of high-content graphene in metals is challenging.Here,aluminum composites with gr
【机 构】
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School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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Due to the high specific surface area of graphene,the effective incorporation of high-content graphene in metals is challenging.Here,aluminum composites with graphene nanoplatelet (GNP) content up to 5.0 vol％ were prepared by spark plasma sintering (SPS) of blended powders with various ball milling regimes and subsequent hot extrusion.The effects of GNP distribution state on the properties of GNP/Al composite were investigated.5.0 vol％ GNPs were uniformly dispersed in aluminum matrix by high-speed ball milling (HSBM) process,but with damage GNPs due to the too high energy input.By contrast,the wellstructured and dispersed GNPs in aluminum powders were obtained via shift-speed ball milling (SSBM).The clear GNP-Al interface in extruded SSBM composite was attributed to well-structured GNPs.As a result,the yield strength (YS) and ultimate tensile strength (UTS) of composite produced by SSBM reached 279 and 303 MPa,which are 166％ and 116％ higher than those of monolithic A1.This demonstrated that it may be promising to introduce high-content GNPs with tailorable interface in A1 alloys via modified ball milling technique and hot extrusion.
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