A series of high-entropy alloy CoCrFeNiV0.5C_x (x = 0.01, 0.02, 0.03 and 0.04) with low C content was fabricated. The alloys were hot rolled, homogenized, cold rolled and annealed for treatment processes. The structure and mechanical properties of the alloy were studied. The formation process of different interstitial carbides and their role in the alloy were discussed. In the original state, these alloys all exhibit single-phase FCC structure, after annealing at different temperatures, a large number of M₇C₃-type interstitial carbides are produced at temperatures of 700 °C and above. The yield strengths (σ_y) of CoCrFeNiV_0.5C_0.02 and CoCrFeNiV_0.5C_0.03 alloys annealed at 700 °C are 1339.7 MPa and 1264.6 MPa, respectively, with excellent performance. In the transmission analysis of CoCrFeNiV_0.5C_0.02, a new type of interstitial carbides, namely non-stoichiometric interstitial carbides M_xC_y, were found. This interstitial carbide promotes the formation of fractured dimples during tensile fracture, and increases the alloy's plasticity without losing strength. The addition of interstitial carbon atoms in the FCC matrix high-entropy alloy synergistic effects of forming two different carbides, and the improved performance of the alloy were investigated. A variety of different carbides are introduced into the alloy through post-cold-rolling heat treatment to further strengthen the alloy, which provides new ideas for the practicality of high-entropy alloys.

制作了一系列 低C含量的高熵合金CoCrFeNiV0.5C _x（x = 0.01、0.02、0.03和0.04）。对该合金进行热轧，均质化，冷轧和退火处理。研究了合金的结构和力学性能。讨论了不同间隙碳化物的形成过程及其在合金中的作用。在原始状态下，这些合金均显示出单相FCC结构，在不同温度下退火后，在700°C及以上的温度下会生成大量M ₇ C ₃型间隙碳化物。屈服强度（σ _ÿ CoCrFeNiV的）_0.5 Ç _0.02和CoCrFeNiV在700°C退火的_0.5 C _0.03合金的性能分别为1339.7 MPa和1264.6 MPa。在CoCrFeNiV _0.5 C _0.02的透射分析中，一种新型的间隙碳化物，即非化学计量的间隙碳化物M _x C _y， 被发现。这种间隙碳化物在拉伸断裂过程中促进了断裂凹坑的形成，并在不损失强度的情况下增加了合金的可塑性。研究了FCC基体高熵合金中形成两种不同碳化物的间隙碳原子的增效作用，以及改善了合金的性能。通过冷轧后热处理将各种不同的碳化物引入合金中，以进一步强化合金，这为高熵合金的实用性提供了新思路。