亚共晶 FCC/B2 双相高熵合金在高温下易受组织非均匀性和相间变形失配的共同制约，难以兼顾强度与塑性。 本文采用冷轧预应变结合中温时效处理，研究了 Ni60Cr10Fe9.9Al18Mo2C0.1 亚共晶高熵合金的时效响应、L12 析出行为及 800 ℃拉伸性能。 结果表明，15%和 30%预应变试样均在 700 ℃下表现出明显时效硬化响应，其中 30%预应变试样具有更高的峰值硬度。 TEM 结果表明，预应变 时 效 后 FCC 基 体内 形 成 L12 有 序 析出 相 ；15%预 应 变 时 效 态 合金 中 L12析出相平均尺寸为(9.17±0.13) nm，而 30%预应变时效态合金中 L12 析出相明显粗化，平均尺寸增加至(44.60±0.43) nm。800 ℃拉伸结果表明，预应变时效可提高合金屈服强度，但显著降低伸长率。 15%预应变时效态合金的屈服强度提高至约 743 MPa，但伸长率降至约 4.7%；当预应变量增加至 30%时，强度提升有限，而伸长率进一步降至约 1.5%。 断口分析表明，FCC 基体强化后，其高温变形协调和裂纹钝化能力下降，裂纹更易由 B2 相及 FCC/B2 相界向 FCC 基体扩展。 因此，直接对铸态合金实施预应变时效虽然能够提高 800 ℃屈服强度，但难以实现强度与塑性的协同优化。

Hypoeutectic FCC/B2 dual-phase high-entropy alloys often suffer from microstructural heterogeneity and deformation incompatibility between their constituent phases at elevated temperatures, making it difficult to balance strength and ductility. In this work, cold-rolling pre-strain followed by intermediate-temperature aging was applied to a Ni60Cr10Fe9.9- Al18Mo2C0.1 hypoeutectic high-entropy alloy to investigate its aging response, L12 precipitation behavior, and tensile properties at 800 ℃.Both the 15% and 30% pre-strained samples show pronounced age-hardening responses at 700 ℃, with the 30% pre-strained sample reaching a higher peak hardness. TEM results confirmed the formation of L12 ordered precipitates in the FCC matrix after pre-strain aging. The average size of the L12 precipitates is (9.17±0.13) nm in the 15% pre-strain-aged alloy, whereas it increases markedly to (44.60±0.43) nm in the 30% pre-strain-aged alloy. Tensile tests at 800 ℃ reveals that pre-strain aging increases the yield strength but substantially reduces the elongation. The 15% pre-strain-aged alloy has a yield strength of approximately 743 MPa, but its elongation decreases to approximately 4.7%. When the pre-strain is increased to 30% , the further strength improvement is limited, whereas the elongation further decreases to approximately 1.5% . Fracture analysis indicates that strengthening of the FCC matrix reduces its