The effect of binder phase content on WC-AlCoCrFeNiTi0.2 high entropy cemented carbides microstructure and mechanical properties

This work aims to explore WC-G201 high entropy cemented carbides properties fabricated by spark plasma sintering with AlCoCrFeNiTi0.2 and WC as binder phase and hard phase respectively. AlCoCrFeNiTi0.2 powder and WC powder were mixed at the mass ratio of 5: 95, 10: 90 and 15: 85 respectively, and then via SPS at 1300℃ for 5min. The results show that the binder phase has good wettability to WC, and with the increase of binder phase content, the hardness of the alloy decreases gradually, fracture toughness increases first and then decreases, the maximum value is 7.88 MPa m1/2. It is estimated that the comprehensive mechanical property of cemented carbides is the best when the binder content is between 5wt% and 10wt%.