Abstract: The 7075 aluminum alloy with an average particle size of 12 μm was selected as the matrix alloy, and the SiC particles with an average particle size of 11 μm was selected as the reinforcement. SiCp/7075Al composite with SiC particle volume fraction of 55% was prepared using the hot isostatic pressing method to investigate the effect of aging treatments at 105 ℃, 125 ℃ and 145 ℃ on the mechanical properties of the composite. The results show that the hardness, bending strength and elastic modulus of the as-fabricated composite are 242.3HBW, 735.8 MPa and 205.3 GPa, respectively. The hardness of the composite aged at 105 ℃ gradually increases as the aging time increases, with the maximum hardness of 318HBW, representing an increment of 31.4% compared to that of the as-fabricated composite. The age-hardening effect of the composite decreases as the aging temperature increases. The stress-strain curves of the composites aged at 105 ℃ and 125 ℃ exhibit a similar trend, showing relatively high and very close bending strengths. The composite aged at 105 ℃ for 21 h has the highest flexural strength of 928 MPa, representing an increment of 26.1% compared to that of the as-fabricated composite. Similarly, the conditional yield strengths (σ0.01, σ0.05 and σ0.1) of the composites aged at 105 ℃ and 125 ℃ increase as the aging time increases. The composite aged at 105 ℃ for 60 h shows better resistance to micro-deformation, with the corresponding σ0.01, σ0.05and σ0.1values being 453.9, 686.6 and 808.6 MPa, respectively, which represent increments of 105.6%,85.8% and 67.0% compared to those of the as-fabricated composite, respectively. The elastic modulus of the aged composites decreases slightly, but it remains at a relatively high level of 192.8 GPa. TEM results indicate that the significant increase in hardness of the 105 ℃-aged composite during the early stage can be attributed to the gradual precipitation of a large number of GP zones in the matrix alloy. Subsequently, the GP zones gradually disappear while the η′ phases precipitate, resulting in the co-existence of the GP zones and the η′ phase in the matrix alloy of the composite aged for 30 h. After aging for 60 h, the precipitates in the matrix alloy are almost entirely η′ phases, with very few η phases. The hardness of the composite increases slowly due to the decreasing number and increasing size of the precipitates during the middle and late stages of the aging process.
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2026, Vol. 40 
