The present work systematically investigates the effect of carbon upon a TWIP alloy Cr₂₀Mn₁₅Fe₃₄Co₂₀Ni₁₁ and a TRIP alloy Cr₂₀Mn₂₄Fe₃₀Co₂₀Ni₆. After doping 0.5 at.% C, C-TWIP and C-TRIP alloy present a single face-centred cubic phase. Both alloys have achieved simultaneous enhancement of strength and ductility. The yield strength of the C-TWIP alloy increases from 130 ± 4 MPa to 235 ± 5 MPa, and the ultimate tensile strength rises from 402 ± 5 MPa to 646 ± 10 MPa, accompanied by about 40% increase in total elongation. The C-TRIP alloy also shows a simultaneous increase in strength and ductility compared to the C-free TRIP alloy, i.e., the yield strength increases from 165 ± 5 MPa to 220 ± 8 MPa, the ultimate tensile strength rises from 460 ± 5 MPa to 639 ± 8 MPa, and ∼36% of the total elongation. Systematic microstructure investigations were carried out before and after tensile deformation. It was found that C-doping in the C-TWIP alloy retains the TWIP effect while suppressing the dominant TRIP effect to the TWIP effect in the C-TRIP alloy. This work illustrates the role of C in the TWIP and TRIP-assisted HEAs and sheds some light on the design of high-performance alloys.

本工作系统地研究了碳对 TWIP 合金 Cr ₂₀ Mn ₁₅ Fe ₃₄ Co ₂₀ Ni ₁₁和 TRIP 合金 Cr ₂₀ Mn ₂₄ Fe ₃₀ Co ₂₀ Ni _{6的影响。}. 在掺杂 0.5 at.% C 后，C-TWIP 和 C-TRIP 合金呈现单一面心立方相。两种合金都实现了强度和延展性的同时提高。C-TWIP合金的屈服强度从130±4 MPa提高到235±5 MPa，极限抗拉强度从402±5 MPa提高到646±10 MPa，同时总伸长率提高了40%左右。与不含C的TRIP合金相比，C-TRIP合金的强度和延展性也同时提高，即屈服强度从165±5 MPa提高到220±8 MPa，极限抗拉强度从460±5 MPa提高到 639 ± 8 MPa，以及总伸长率的 36%。在拉伸变形前后进行了系统的微观结构研究。发现C-TWIP合金中的C掺杂保留了TWIP效应，同时抑制了占主导地位的TRIP效应对C-TRIP合金中的TWIP效应。这项工作说明了 C 在 TWIP 和 TRIP 辅助 HEA 中的作用，并为高性能合金的设计提供了一些启示。