Abstract
The effect of C-alloying on phase constituent, microstructure and mechanical behaviour of a novel Co-free (Fe36Mn36Ni9Cr9Al10)100-xCx (x = 0, 1.5, 2.5, 3.5, 5, 6) low-cost high entropy alloy (HEA) system was investigated. Addition of carbon promoted the transformations of BCC and B2 phase in the original C-free HEA into FCC phase. At a carbon content of 2.5 at.-% and beyond, hardly BCC phase constituent can be obtained. Optimised mechanical properties with a yield strength of 387 MPa, tensile strength of 741 MPa along with excellent ductility of 57% were achieved at a carbon content of 2.5 at.-%. The improvement in mechanical properties of the (Fe36Mn36Ni9Cr9Al10)97.5C2.5 HEA can be ascribed to enhance the work hardening ability originated from microband-induced plasticity effect.
Acknowledgements
This study was supported by National Natural Science Foundation of China (51671150, 51901167 and 51931005). Shaanxi Outstanding Youth fund (2020JC-49) and Youth Innovation Team of University in Shaanxi Province.
Disclosure statement
No potential conflict of interest was reported by the author(s).