The effects of the elemental Al or C addition on the microstructure and room-temperature mechanical properties of a cost-effective Cr₁₂Fe₆₀Mn₁₆Ni₁₂ medium-entropy alloy were investigated. The yield stress of a medium-entropy alloy substantially increased from 230 MPa to 458 MPa following the addition of small amounts of elemental Al (∼2.0 at.%) or C (∼1.0 at.%). Throughout experimentation and theoretical modeling, we were able to systematically show that the improvement in the yield stress following the Al/C addition was attributed to the combination of various strengthening mechanisms, such as grain boundary strengthening, precipitation strengtheing, and solid-solution strengthening mainly caused by the lattice distortion or lattice strain. On the fundamental level, this work provides insights into the effect of the lattice constant on the stress increase for both substitutional and interstitial solid-solution strengthening.

添加元素 Al 或 C 对具有成本效益的 Cr ₁₂ Fe ₆₀ Mn ₁₆ Ni _{12的微观结构和室温机械性能的影响}研究了中熵合金。添加少量元素 Al (~2.0 at.%) 或 C (~1.0 at.%) 后，中熵合金的屈服应力从 230 MPa 显着增加至 458 MPa。通过实验和理论建模，我们能够系统地表明，添加 Al/C 后屈服应力的提高归因于多种强化机制的组合，例如晶界强化、沉淀强化和固溶强化。由晶格畸变或晶格应变引起。在基本层面上，这项工作提供了关于晶格常数对替代和间隙固溶体强化应力增加的影响的见解。