Break the strength and ductility trade-off in novel NbC reinforced Fe40.5(CoCr)25Mn17.5Ni10Si5 high entropy alloy

• DOI: 10.1016/j.matdes.2024.112752
• Publication Date: 2024-02-13T08:51:33Z
• Authors: Naqash Ali; Jiale Li; Liqiang Zhang; Chaojie Zhang; Hongwei Zhou; Dongming Liu; Kiran Sanaullah; Yi Nian; Jinjun Cheng
• Keywords: Twip; Ductility (Earth science); Deformation mechanism; High-Entropy Alloys; Deformation bands

In this study, a novel NbC reinforced Fe40.5(CoCr)25Mn17.5Ni10Si5 high entropy alloy (HEA) was designed, which exhibits strength and ductility at room temperature. This prepared through hot forging annealing treatments, exhibited the FCC microstructure with discrete nano-sized M23C6 carbides precipitation. The studied HEA retained tensile of 863 MPa, an outstanding 58 %. evolution deformation mechanisms were further investigated. mechanism mainly governed by nano-scale defect heterogeneity stacking faults (SFs), twins dislocations. improved strength-ductility synergy is attributed to formation multiple SFs, twining, dislocation cells, Moreover, TEM observation elucidates presence chemical short-range order (SRO) domain in HEA, also has major contribution increment. present findings shed light on developing HEAs proper compositional design heat resulting combine effect precipitation strengthening, SFs mediated plasticity, twinning induced plasticity (TWIP), SRO effect.