“…Recently, graphene-reinforced metal matrix composites (GMMCs) have been studied by considerable research efforts and have been shown to exhibit pronounced potential as the next generation functional and structural materials [ 15 , 16 , 17 , 18 ]. To date, graphene as the reinforcing phase has been added into a series of metal matrices, such as Al [ 19 , 20 ], Cu [ 21 , 22 ], Ni [ 23 , 24 ], Co [ 25 ], Ti [ 26 ], Mg [ 27 ], Ag [ 28 ], Fe [ 29 ], W [ 30 ], V [ 31 ], Al alloys [ 32 , 33 ], Mg alloys [ 34 ], Sn alloy [ 35 ], Ni–Al alloy [ 36 ], Ti–Al alloy [ 37 ], and W–Cu alloy [ 38 ]. Nevertheless, many challenges still need to be overcome in the practical applications of graphene/metal composites.…”