▎ 摘　　要

Poor chemical stability of graphene in titanium (Ti) is one critical problem to make use of the extraordinary properties of graphene for obtaining high-performance graphene/Ti composites. To overcome this problem, the selective laser melting (SLM) process with rapid heating and cooling characteristics was exploited to fabricate graphene nanosheet (GNS)-reinforced Ti-6Al-4V matrix composite in this study. Results showed that the SLMed composite registered super-high tensile strength (1526 MPa) and high Young's modulus (145 GPa), which were 73% and 26% lager than those of spark plasma sintered composites fabricated from the same powder mixture, respectively. It was found that the locally reacted GNSs and in-situ formed ultrafine TiC particles mainly contributed to the outstanding mechanical properties of SLMed GNSs/Ti composites. The underlying mechanism was thoroughly discussed based on microstructures and strengthening models. The results pave up the way towards the fabrication of super-strong Ti matrix composites. (C) 2020 Elsevier Ltd. All rights reserved.