Microstructure and Wear Properties of WMoNbTaV- Al2O3 High Entropy Alloy Prepared by Spark Plasma Sintering

A new refractory high entropy alloy WMoNbTaV containing Al2O3 was prepared by spark plasma sintering. The effects of sintering temperature on densification behavior, phase structure, microstructure and wear resistance of the alloy were studied. The results show that when sintered at 1800. 1900 degrees C, the matrix of WMoNbTaV-Al2O3 has a single bcc phase structure, and the average grain size of Al2O3 is 1.15 mu m. With the increase in sintering temperature, the grain size of the alloy increases, the density and microhardness also increase, and the hardness reaches 7967.4 MPa when the sintering temperature is 1900 degrees C. The alloy sintered at 1900 degrees C has excellent wear resistance, and the wear amount is only half of that of the alloy sintered at 1800 degrees C. The wear resistance of WMoNbTaV-Al2O3 high entropy alloy is much higher than that of pure W material. When the abrasive particle size is 37.5 mu m, the wear mass loss of alloy sintered at 1900 degrees C is 0.9 mg, and the wear resistance of alloy is 83 times higher than that of pure W material.