Abstract
The double effect of diffusion barrier and interfacial strengthening on the interface behavior in a Ti-coated diamond and high entropy alloy (HEA) composite was investigated. The first-principles simulations exhibited that the in-situ formed TiC played a significant role as a diffusion barrier between diamond and HEA matrix, resulting in the reduction of sp2 hybridization of diamond and enhanced the interface bonding strength. The simulation results were further confirmed by experiments. In Ti-coated diamond-HEA composite fabricated by selective laser melting, the TiC layer obstructed the direct contact between diamond particles and the transition metal elements in HEA, thus preventing graphitization of diamond and enhancing the interface bonding strength. Moreover, part of Ti in Ti coating entered into the HEA matrix and increased the lattice distortion, resulting in substitutional solution strengthening effect and improving the retention on diamond abrasives. The superior wear properties of Ti-coated diamond composite attributed to the diffusion barrier of TiC and interfacial strengthening of TiC and Ti containing HEA solid solution.
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