摘要
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 Al.This demonstrated that it may be promising to introduce high-content GNPs with tailorable interface in Al alloys via modified ball milling technique and hot extrusion.
基金
supported by the National Key R&D Program of China(Grant No.2017YFB0703103)
Guangdong Province Key Area R&D Program(Grant No.2019B010942001)。
