Excellent plasticity of C and Mo alloyed TRIP high entropy alloy via rolling and heat treatment

Abstract

The transformation-induced plasticity (TRIP) Fe50Mn30Co10Cr10 high entropy alloy (HEA) with 2 at% C and 1 at% Mo microalloying was prepared by non-consumable vacuum arc melting furnace. The as-casted alloy was then rolled at 70% and then annealed at 1000 °C for different times. The microstructure evolution and mechanical properties of the C and Mo alloyed TRIP-HEA were systematically investigated. The results showed that with the increase of annealing time, the strength of the C2Mo1 HEA increases, but the plasticity increases first and then decreases. Spuriously, when C2Mo1 HEA was annealed for 5 min at 1000 °C after 70% cold rolling, the total elongation was 121%, the tensile strength was 816 MPa, and its product of tensile strength and plasticity was 99.23 GPa, which is much better than the majority of HEAs. In the process of tensile deformation, + //TD double texture are formed, and dislocation slip and twin mechanism competed by each other, which affect the microstructure evolution in the process of plastic deformation, and finally as the great contribution to the product of tensile strength and plasticity.

Keywords

• Cast
• Deformation and fracture
• High entropy alloys
• Ductility