▎ 摘　　要

Interface reaction between matrix and reinforcement plays a crucial role in determining the mechanical prop-erties of graphene nanoplatelets reinforced titanium (GNPs/Ti) composites. Manipulation of the micro-scaled structure of three-dimensional (3D) interface has been shown to provide GNPs/Ti composites with enhanced interfacial adhesion and stronger strain accommodation behaviors. In order to understand the kinetics of such interface reactions, and provide a new guidance for the meticulous design of 3D interface in GNPs/Ti composites. In this study, in situ TEM heating was used to uncover the evolutions of 3D interface microstructure and make direct and real-time measurements of the interfacial reaction products (TiC and TiB whiskers, TiBw). Experimental results indicated that GNPs modified with B film had decelerated the tendency of GNPs-Ti interface reaction. The calculated diffusion coefficient for B in TiBw D-B(TiBw)(1123K) along the needle direction was about 12.5 times larger than that of D-B(TiBw)(1053K). The interfacial mechanics behaviors related to diverse heat treatments were deeply studied by means of the micro-pillar compression tests. Combined with the interfacial densification degree and mechanics behaviors, this study had formulated the optimized regime for accurately constructing ideal 3D interface structure, and highlighted a feasible route for achieving good mechanical properties in GNPs/Ti composites.