Comparative study of microstructure and mechanical properties of thermo-mechanically processed Al (0.2,0.5) CoCrFeNiMo0 . 5 high-entropy alloys

The main objective of the present work is to produce AlxCoCrFeNiMo0.5 alloy through a wrought process. AlxCoCrFeNiMo0.5 high-entropy alloys with two different Al contents (x = 0.2 and 0.5) were prepared by vacuum arc melting followed by thermo-mechanical processing. Microstructural evolution was investigated after hot forging and subsequent homogenisation using XRD, SEM, and TEM. The final microstructure corresponding to Al-0.2 and Al-0.5 are BCT (sigma) in the FCC matrix and BCT (sigma) and ordered BCC together in the FCC matrix respectively. Room-temperature mechanical properties were investigated using uniaxial compression and hardness measurements. There is an apparent increase in strength and a decrease in ductility for the Al-0.5 alloy. However, a higher ductility was observed in Al-0.2 alloy with a compromised reduction in strength.

Automated summary

The objective of this study is to produce AlxCoCrFeNiMo0.5 alloy through a wrought process. AlxCoCrFeNiMo0.5 high-entropy alloys with different Al contents (x = 0.2 and 0.5) were prepared and their microstructural evolution and mechanical properties were investigated. The final microstructure of Al-0.2 alloy consisted of BCT (sigma) phase in the FCC matrix, while Al-0.5 alloy had a combination of BCT (sigma) and ordered BCC phases in the FCC matrix. The Al-0.5 alloy exhibited increased strength but decreased ductility, while the Al-0.2 alloy showed higher ductility with a compromised reduction in strength.