Effects of Sintering Temperature on Properties of AlCoCrFeNi_2.1 High-Entropy Alloy by Spark Plasma Sintering

AlCoCrFeNi_2.1 high-entropy alloy was prepared by spark plasma sintering (SPS) at different sintering temperatures (850,950,1 050,1 150℃) for 5 min. The effects of sintering temperature on sintering properties, phase composition, micromorphology, mechanical properties of the alloy were studied. The results show that with sintering temperature increasing, the amount of pores on the surface of the alloy decreased and the relative density of the alloy increased. When the sintering temperature rose to 1 150℃, good metallurgic bonding was formed between the alloy particles. With the increase of sintering temperature, the microhardness and yield strength of the sintered alloy increased first and then decreased. When the sintering temperature was 1 050℃,the microhardness and yield strength of the sintered alloy were the highest. The fracture mechanism of the sintered alloy was intergranular fracture and transgranular fracture.