The effects of carbon content on the microstructure and room-temperature mechanical properties of Fe₄₀Mn₄₀Co₁₀Cr₁₀ high-entropy alloy (HEA) were systematically investigated. The results showed that heavy carbon alloyed HEA could possess supreme combination of high tensile strength (935 MPa) and high ductility (~ 74%). The excellent mechanical properties were ascribed to as follows: the high content interstitial carbon atoms strengthens the matrix greatly through suppressing dislocation motion and promoting the deformation-induced twinning at room temperature, which enhance the strength and ductility. Simultaneously, the ductility is further secured for single FCC structure maintained due to appropriate carbon alloying. Our findings provide a novel strategy for developing HEAs with excellent mechanical properties.

碳含量对Fe ₄₀ Mn ₄₀ Co ₁₀ Cr ₁₀的显微组织和室温力学性能的影响对高熵合金（HEA）进行了系统研究。结果表明，重碳合金HEA可以具有高抗拉强度（935 MPa）和高延展性（〜74％）的最高组合。优异的机械性能归因于：高含量的间隙碳原子通过抑制位错运动并促进在室温下形变引起的孪晶而极大地增强了基体，从而增强了强度和延展性。同时，对于由于适当的碳合金化而保持的单个FCC结构，进一步确保了延展性。我们的发现为开发具有优异机械性能的HEA提供了一种新颖的策略。