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<p>In nanoparticle-reinforced metal composites, material performance exhibits a non-monotonic dependence on reinforcement content, thus remaining inadequately explained by conventional macroscopic analysis. To address this, Al matrix composites were fabricated by varying Al<sub>2</sub>O<sub>3</sub> nanoparticle content (5–35&#xa0;wt.%) via direct current fast hot-pressing sintering (FHPs). Electron work function (EWF) analysis was employed to elucidate how reinforcement content affects the material interface and resulting properties. It was found that the optimal reinforcement content lies within 15–25&#xa0;wt.%, where the composite achieves a balanced enhancement in compressive strength, hardness, wear, and cavitation erosion resistance. Nevertheless, at 35&#xa0;wt.% Al<sub>2</sub>O<sub>3</sub>/Al composite, agglomeration of nanoparticles reduces interfacial integrity and promotes localized micro-galvanic corrosion, which compromises material properties. EWF analysis revealed that the addition of nano-Al<sub>2</sub>O<sub>3</sub> particles enhanced the overall surface electromotive force of the composites. As the nano-Al<sub>2</sub>O<sub>3</sub> particle content increased, localized particle aggregation occurred, which reduced the electromotive force at the interfaces and consequently had a detrimental effect on the overall contact potential performance of the composite.</p>

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Unraveling the Interplay Between Interfacial Behavior and Performance in Nano-Al2O3/Al Composites via Electron Work Function (EWF) Methodology

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Zirun Yang,
  • Beibei Cai,
  • Huihui Zhang,
  • Hua Lan,
  • Kunyou Zhang,
  • Xinjiang Zhang,
  • Xinxing Li,
  • Bin Luo,
  • Aakash Kumar,
  • Dongyang Li

摘要

In nanoparticle-reinforced metal composites, material performance exhibits a non-monotonic dependence on reinforcement content, thus remaining inadequately explained by conventional macroscopic analysis. To address this, Al matrix composites were fabricated by varying Al2O3 nanoparticle content (5–35 wt.%) via direct current fast hot-pressing sintering (FHPs). Electron work function (EWF) analysis was employed to elucidate how reinforcement content affects the material interface and resulting properties. It was found that the optimal reinforcement content lies within 15–25 wt.%, where the composite achieves a balanced enhancement in compressive strength, hardness, wear, and cavitation erosion resistance. Nevertheless, at 35 wt.% Al2O3/Al composite, agglomeration of nanoparticles reduces interfacial integrity and promotes localized micro-galvanic corrosion, which compromises material properties. EWF analysis revealed that the addition of nano-Al2O3 particles enhanced the overall surface electromotive force of the composites. As the nano-Al2O3 particle content increased, localized particle aggregation occurred, which reduced the electromotive force at the interfaces and consequently had a detrimental effect on the overall contact potential performance of the composite.