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<p>The age-hardening behavior of the 45&#xa0;vol.% SiC<sub>p</sub>/7075Al composite and its influence on the mechanical properties have been investigated. The findings reveal accelerated aging kinetics along with a significant improvement in mechanical properties. The composite aged at 105°C for 30&#xa0;h attains maximum yield and bending strengths of 953&#xa0;MPa and 1105&#xa0;MPa, respectively. This represents an increase of 106% and 39.7% compared to those of the as-fabricated composite, which can be attributed to the coexistence of GP zones and η′ phases. Moreover, the conditional yield strengths (<i>σ</i><sub>0.01</sub>, <i>σ</i><sub>0.05</sub>, and <i>σ</i><sub>0.1</sub>) of the composite aged at 105°C for 60&#xa0;h are 472&#xa0;MPa, 726&#xa0;MPa, and 843&#xa0;MPa, respectively. These values correspond to increments of approximately 173%, 164%, and 138%, respectively, indicating an enhanced resistance to micro-yielding deformation. In contrast to the double-peak behavior observed in the monolithic 7075 alloy, the SiC<sub>p</sub>/7075Al composite aged at 145°C exhibits a single peak at 10.5&#xa0;h. This is ascribed to the presence of η′ precipitates in the Al matrix, with the number density of approximately 0.98 × 10<sup>23</sup>&#xa0;m<sup>-3</sup>. Notably, the best aging temperature for SiC<sub>p</sub>/7075Al composites, namely 105°C, is lower than that of the monolithic 7075 alloy.</p>

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Aging Behavior and Mechanical Properties of 45 vol.% SiCp/7075Al Composite

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Quan Zhou,
  • Shihong Liang,
  • Leigang Cao,
  • Yue Yang,
  • Yuan Liu,
  • Changhong Cai,
  • Yan Cui

摘要

The age-hardening behavior of the 45 vol.% SiCp/7075Al composite and its influence on the mechanical properties have been investigated. The findings reveal accelerated aging kinetics along with a significant improvement in mechanical properties. The composite aged at 105°C for 30 h attains maximum yield and bending strengths of 953 MPa and 1105 MPa, respectively. This represents an increase of 106% and 39.7% compared to those of the as-fabricated composite, which can be attributed to the coexistence of GP zones and η′ phases. Moreover, the conditional yield strengths (σ0.01, σ0.05, and σ0.1) of the composite aged at 105°C for 60 h are 472 MPa, 726 MPa, and 843 MPa, respectively. These values correspond to increments of approximately 173%, 164%, and 138%, respectively, indicating an enhanced resistance to micro-yielding deformation. In contrast to the double-peak behavior observed in the monolithic 7075 alloy, the SiCp/7075Al composite aged at 145°C exhibits a single peak at 10.5 h. This is ascribed to the presence of η′ precipitates in the Al matrix, with the number density of approximately 0.98 × 1023 m-3. Notably, the best aging temperature for SiCp/7075Al composites, namely 105°C, is lower than that of the monolithic 7075 alloy.