Microstructure and Mechanical Properties of CoCrFeNi_2Al_(1−x)W_x High Entropy Alloys

摘要

The microstructures, phase composition, and mechanical properties of the CoCrFeNi2Al1-xWx (x: molar ratio, x=0, 0.2, and 0.3) high entropy alloys were investigated. Only BCC phase and FCC phase were found in CoCrFeNi2Al1-xWx alloys. Thereinto, the CoCrFeNi2Al alloy was comprised of the primary phase with BCC structure and the eutectic structures with BCC and FCC phases. The CoCrFeNi2Al0.9W0.1, CoCrFeNi2Al0.8W0.2, and CoCrFeNi2Al0.7W0.3 alloys were comprised of the primary phase with FCC structure and the eutectic structures with BCC and FCC phases. The main effect of Al element on CoCrFeNi2Al1-xWx alloys was tailoring the proportion of BCC phase and FCC phase, while W element played a greater role than Al element in the solid solution strengthening effect. Hence, the mechanical properties of AlCoCrFeNi2 alloy can be tailored by adjusting the concentration of Al and W elements to obtain a wider range of applications.