An interstitial solute strengthened high entropy alloy (iHEA), Fe_49.5Mn₃₀Co₁₀Cr₁₀C_0.5 (at.%), was successfully additively manufactured via selective laser melting. The as-built iHEA exhibits a hierarchically heterogeneous microstructure with length scales across several orders of magnitude, which engenders an enhanced strength–ductility combination relative to those fabricated by conventional processing routes. The high yield strength mainly stemmed from the dislocation strengthening besides the friction stress and grain boundary strengthening. The joint activation of multiple deformation mechanisms involving dislocation slip, deformation twinning and phase transformation can maintain the steady work-hardening behavior at high stress levels, leading to a high ductility.

间隙溶质增强高熵合金（iHEA）Fe _49.5 Mn ₃₀ Co ₁₀ Cr ₁₀ C _0.5（at。％），通过选择性激光熔化成功地添加制造。建成后的iHEA表现出分层的异质微观结构，其长度尺度跨越几个数量级，与传统的加工路线相比，其强度-延展性组合得到了增强。高屈服强度主要来自位错强化，除了摩擦应力和晶界强化。包括位错滑移，变形孪生和相变在内的多种变形机制的联合激活可以在高应力水平下保持稳定的加工硬化行为，从而导致高延展性。