Carbide precipitates are effective for improving the strength and stability of high-entropy alloys. In this work, novel-designed Fe₆₀Co₁₀Cr₁₀Ni₁₀Mo₅V₅ medium-entropy alloys (MEAs) containing 1 wt.% carbon were prepared by vacuum arc melting followed by solid solution treatment and aging. The effects of aging on the microstructure and mechanical properties of the MEAs were investigated. The results showed that the microstructure of the solution-treated alloy was comprised of the face-centered cubic (FCC) matrix, coarse M₂C/MC carbides, and tiny fine undissolved MC precipitates distributed on the grain boundaries and inside the grains. A high number density of cube-shaped MC precipitates, with an approximate mean size of 24 nm precipitate within the FCC matrix in the case of aging at 800°C for 2 h, contribute to the highest hardness and tensile strength of the sample without sacrificing its elongation. With increasing aging temperature and time, the size of the MC precipitates increased while their volume fraction decreased. The strengthening effect can be attributed to the combination of the precipitation strengthening and solid solution strengthening.

碳化物沉淀物对于改善高熵合金的强度和稳定性是有效的。在这项工作中，通过真空电弧熔化，固溶处理和时效处理，制备了新颖设计的含碳1 wt％的Fe ₆₀ Co ₁₀ Cr ₁₀ Ni ₁₀ Mo ₅ V ₅中熵合金（MEA）。研究了时效对MEA的微观结构和力学性能的影响。结果表明，固溶处理后的合金的微观结构由面心立方（FCC）基体，粗M _2组成。C / MC碳化物和微细的未溶解的MC沉淀物分布在晶界和晶粒内部。在800°C老化2小时的情况下，高密度的立方​​状MC沉淀物的密度较高，在FCC基质中沉淀物的平均尺寸约为24 nm，有助于在不牺牲样品的情况下实现最高的硬度和拉伸强度其伸长率。随着老化温度和时间的增加，MC沉淀物的尺寸增加，而其体积分数减小。强化作用可以归因于沉淀强化和固溶强化的组合。