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<p>Positron annihilation lifetime spectroscopy (PALS), a nuclear technique sensitive to vacancy-type defects, was employed to investigate nano-Al–SiC composites synthesized via the powder metallurgy (PM) route. Nanoscaled pure Al-6063 powder underwent high-energy ball milling and was homogeneously mixed with nano-sized SiC particles at varying concentrations of 0, 0.6, 1.2, 1.8, 2.4, and 3 wt.%. The composite powders were compacted under 100&#xa0;MPa and sintered in a vacuum furnace at 600&#xa0;°C for 1&#xa0;h. X-ray fluorescence (XRF) analysis confirmed the chemical composition of the Al-6063 powder, while X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to characterize both the powder and sintered samples. Microhardness tests were conducted to assess the mechanical properties. Additionally, gamma attenuation measurements were performed on the sintered samples using gamma-ray energies of 0.662, 1.173, and 1.332&#xa0;MeV. The composite containing 0.6 wt.% SiC exhibited a maximum relative density of 99%. A detailed correlation between average positron annihilation lifetime and microhardness revealed a notable trend; the sample with 3 wt.% SiC showed the shortest positron lifetime and the highest microhardness. Gamma attenuation analysis confirmed that the 3 wt.% SiC sample also exhibited the highest attenuation across all applied energies. These results highlight the intricate interplay between nano-SiC content, defect structures, mechanical strength, and gamma shielding properties, offering a comprehensive insight into the optimization of Al–SiC nanocomposites for advanced nuclear and structural applications.</p>

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Non-destructive void analysis of Al6063–SiC nanocomposites for gamma shielding applications

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Omayma A. Elkady,
  • Mostafa Alouba,
  • Ahmed I. Ali,
  • Dongwhi Choi,
  • Fathei Nouh

摘要

Positron annihilation lifetime spectroscopy (PALS), a nuclear technique sensitive to vacancy-type defects, was employed to investigate nano-Al–SiC composites synthesized via the powder metallurgy (PM) route. Nanoscaled pure Al-6063 powder underwent high-energy ball milling and was homogeneously mixed with nano-sized SiC particles at varying concentrations of 0, 0.6, 1.2, 1.8, 2.4, and 3 wt.%. The composite powders were compacted under 100 MPa and sintered in a vacuum furnace at 600 °C for 1 h. X-ray fluorescence (XRF) analysis confirmed the chemical composition of the Al-6063 powder, while X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to characterize both the powder and sintered samples. Microhardness tests were conducted to assess the mechanical properties. Additionally, gamma attenuation measurements were performed on the sintered samples using gamma-ray energies of 0.662, 1.173, and 1.332 MeV. The composite containing 0.6 wt.% SiC exhibited a maximum relative density of 99%. A detailed correlation between average positron annihilation lifetime and microhardness revealed a notable trend; the sample with 3 wt.% SiC showed the shortest positron lifetime and the highest microhardness. Gamma attenuation analysis confirmed that the 3 wt.% SiC sample also exhibited the highest attenuation across all applied energies. These results highlight the intricate interplay between nano-SiC content, defect structures, mechanical strength, and gamma shielding properties, offering a comprehensive insight into the optimization of Al–SiC nanocomposites for advanced nuclear and structural applications.