Effect of diffusion barrier and interfacial strengthening on the interface behavior between high entropy alloy and diamond

Release time:2021-08-02

DOI number:10.1016/j.jallcom.2020.157023

Journal:Journal of Alloys and Compounds

Key Words:High entropy alloys, Diamond, Interfaces, Diffusion, Carbides

Abstract:The double effect of diffusion barrier and interfacial strengthening on the interface behavior in a Ticoated 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.

First Author:彭英博

Indexed by:Journal paper

Correspondence Author:张伟

Document Code:157023

Discipline:Engineering

First-Level Discipline:Materials Science and Engineering

Document Type:J

Volume:852

Translation or Not:no

Date of Publication:2020-09-06

Included Journals:SCI