Abstract
An as-cast CrFeNiAl0.28Si0.08Ti0.02Cu0.01C0.01 high-entropy alloy (HEA) was designed via minor C substitution for Si in a high-strength CrFeNiAl0.28Si0.09Ti0.02Cu0.01 HEA with FCC + BCC dual-phase heterostructure. Compared to its C-free counterpart with fine sideplate structure, this HEA has higher proportion of FCC phase with relatively coarser island-like structure, and exhibits remarkable increase in production of ultimate tensile strength (UTS) and plasticity with ∼ 25 %, while maintaining its UTS to > 1GPa, which has excellent comprehensive mechanical properties in as-cast heterostructure HEAs. High dislocation storage ability is possibly the main reason for high UTS and plasticity of this HEA. This work provides a novel insight for the optimization of microstructure and mechanical properties of heterostructure HEAs in as-cast state.
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