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<p>This research investigates the effect of process parameters on AA5083/CeO2/TiO2 nanocomposites, focusing on microstructure, hardness, tribological properties, and corrosion resistance. Additive-manufactured aluminum alloy-matrix hybrid nanocomposites were produced using a combination of six different rotational and vertical speeds through modified friction stir deposition, and an additive-manufactured non-composite sample as a reference was produced to be compared with manufactured nanocomposite samples. This study investigated microstructure evolution, characteristics, phase distribution, corrosion resistance, hardness, and tribological behavior of samples. Grain refinement improved by 28.8% to 36.6% compared to the reference (6.28&#xa0;μm grain size) due to the addition of nanoparticles, shear of friction stir rotation, and heat generation. Decreasing the vertical speed from 35 to 15&#xa0;mm/min and the rotation speed to 700&#xa0;rpm caused higher shear and suitable nanoparticle distribution, which resulted in 4% and 10.9% grain size improvement, respectively. Decreasing the grain sizes and the addition of hard nanoparticles caused hardness to increase from 8.75% to 14% compared to the reference (89.4 Hv). Wear rates improved from 0.2 × 10<sup>–3</sup> to 0.1 × 10<sup>–3</sup> mm<sup>3</sup>/N·m, compared to the reference wear rate of 0.25 × 10<sup>–3</sup> mm<sup>3</sup>/N·m due to nanoparticles addition, the samples' higher hardness, and the nanoparticles' suitable distribution.</p>

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Effect of CeO2 and TiO2 nanoparticles on properties and microstructure of additive manufactured AA5083 hybrid nanocomposites via friction stir deposition

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Mohammad Navidi-Helan,
  • Seyyed Ehsan Mirsalehi

摘要

This research investigates the effect of process parameters on AA5083/CeO2/TiO2 nanocomposites, focusing on microstructure, hardness, tribological properties, and corrosion resistance. Additive-manufactured aluminum alloy-matrix hybrid nanocomposites were produced using a combination of six different rotational and vertical speeds through modified friction stir deposition, and an additive-manufactured non-composite sample as a reference was produced to be compared with manufactured nanocomposite samples. This study investigated microstructure evolution, characteristics, phase distribution, corrosion resistance, hardness, and tribological behavior of samples. Grain refinement improved by 28.8% to 36.6% compared to the reference (6.28 μm grain size) due to the addition of nanoparticles, shear of friction stir rotation, and heat generation. Decreasing the vertical speed from 35 to 15 mm/min and the rotation speed to 700 rpm caused higher shear and suitable nanoparticle distribution, which resulted in 4% and 10.9% grain size improvement, respectively. Decreasing the grain sizes and the addition of hard nanoparticles caused hardness to increase from 8.75% to 14% compared to the reference (89.4 Hv). Wear rates improved from 0.2 × 10–3 to 0.1 × 10–3 mm3/N·m, compared to the reference wear rate of 0.25 × 10–3 mm3/N·m due to nanoparticles addition, the samples' higher hardness, and the nanoparticles' suitable distribution.