采用混合熔盐法制备xTiB₂/Al-5Cu-0.85Mn-0.35Mg-0.5Ag（x=0%，1%，3%，5%，质量分数，下同）复合材料，并进行单级时效和断续时效处理，研究不同热处理工艺对材料微观组织和力学性能的影响。结果表明：随着TiB₂含量的增加，复合材料的硬度和强度均呈持续增加趋势，但伸长率逐渐下降。当 TiB₂ 含量为 3%时，单级时效处理（175 ℃/3 h）后，复合材料的屈服强度、抗拉强度、弹性模量和伸长率分别为465.1，496.8 MPa，78.9 GPa和4.8%，采用175 ℃/1.5 h+150 ℃/13.5 h 断续时效处理后，复合材料的屈服强度、抗拉强度和弹性模量分别提高至479.3，507.2 MPa 和 79.1 GPa，比单级时效处理分别提高了5.9%，2.1%和0.25%，伸长率下降至4.1%。二次时效温度显著影响时效沉淀相的析出序列，是材料性能得以大幅提高的主要原因，当二次时效温度为 100 ℃ 时，θ'-Al₂Cu 相为主要时效强化相，二次时效温度为150 ℃时，Ω-Al₂Cu相成为主要的时效强化相。

The xTiB₂/Al-5Cu-0.85Mn-0.35Mg-0.5Ag（x=0%，1%，3%，5%，mass fraction， the same below） composites are fabricated by a mixed salt reaction method， followed by single-stage and interrupted aging treatments. The effects of differing thermal processing regimes on the microstructural and mechanical properties of the materials are systematically studied. The results indicate that as the TiB₂ content increases， both the hardness and strength of the composites show a continuous upward trend， while the elongation gradually decreases. When the TiB₂ content is 3%， after single-stage aging treatment （175 ℃/3 h）， the composite’s yield strength， tensile strength， elastic modulus， and elongation reach 465.1， 496.8 MPa， 78.9 GPa， and 4.8%， respectively. After undergoing an interrupted aging process at 175 ℃ for 1.5 h followed by 150 ℃ for 13.5 h， the yield strength， tensile strength， and elastic modulus of the composites increase to 479.3， 507.2 MPa， and 79.1 GPa， respectively， representing increases of 5.9%， 2.1%， and 0.25% compared to the single-stage aging treatment， with an elongation of 4.1%. The secondary aging temperature significantly affects the precipitation sequence of aging precipitates， which is the main reason for the substantial improvement in material properties. When the secondary aging temperature is 100 ℃， the θ'-Al₂Cu phase is the primary aging strengthening phase. At a secondary aging temperature of 150 ℃， the Ω-Al₂Cu phase becomes the main aging strengthening phase.