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<p>Silicon carbide particle-reinforced aluminum (SiCp/Al) is a widely used metal matrix composite owing to its low density, high stiffness, and wear resistance. However, its performance under demanding service conditions is often constrained by interfacial incompatibility and poor plasticity. Here, we rationally engineer the SiC/Al interface by pre-oxidizing SiC to introduce silica-rich (SiO<sub>2</sub>-rich) amorphous interlayers with tunable thickness (0–272&#xa0;nm). The composite containing moderately thick SiO<sub>2</sub>-rich layers (~ 128 ± 9&#xa0;nm) exhibits superior mechanical performance, simultaneously achieving improved ductility and toughness (+ 18.3% and + 15.4% relative to the unoxidized counterpart), while maintaining decent ultimate tensile strength (259.9 ± 4.1&#xa0;MPa). The retained strength mainly originates from the load-bearing contribution of stiff SiC particles, while the optimized oxide interlayer helps maintain effective stress transfer and sustained hetero-deformation-induced (HDI) contribution. The improved ductility is associated with enhanced interfacial compatibility, higher interfacial strength, smoother stress/strain transition, and delayed strain localization, whereas the increased toughness further benefits from distributed microcrack-mediated energy dissipation. These findings underscore the critical role of interfacial compatibility in dictating the macroscopic mechanical properties and provide a transferable interface-design strategy for toughening particle-reinforced metal matrix composites.</p>

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Enhanced plastic deformability of SiCp/Al composites via compatible pre-oxidized silica-rich interlayers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月21日

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  • Xuyang Feng,
  • Wangshu Zheng,
  • He Cao,
  • Qiubao Ouyang,
  • Shuangyue Jia,
  • Zhongxin Zhao,
  • Bo Li,
  • Lei Zhao,
  • Qiang Guo

摘要

Silicon carbide particle-reinforced aluminum (SiCp/Al) is a widely used metal matrix composite owing to its low density, high stiffness, and wear resistance. However, its performance under demanding service conditions is often constrained by interfacial incompatibility and poor plasticity. Here, we rationally engineer the SiC/Al interface by pre-oxidizing SiC to introduce silica-rich (SiO2-rich) amorphous interlayers with tunable thickness (0–272 nm). The composite containing moderately thick SiO2-rich layers (~ 128 ± 9 nm) exhibits superior mechanical performance, simultaneously achieving improved ductility and toughness (+ 18.3% and + 15.4% relative to the unoxidized counterpart), while maintaining decent ultimate tensile strength (259.9 ± 4.1 MPa). The retained strength mainly originates from the load-bearing contribution of stiff SiC particles, while the optimized oxide interlayer helps maintain effective stress transfer and sustained hetero-deformation-induced (HDI) contribution. The improved ductility is associated with enhanced interfacial compatibility, higher interfacial strength, smoother stress/strain transition, and delayed strain localization, whereas the increased toughness further benefits from distributed microcrack-mediated energy dissipation. These findings underscore the critical role of interfacial compatibility in dictating the macroscopic mechanical properties and provide a transferable interface-design strategy for toughening particle-reinforced metal matrix composites.