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<p>In this study, the closed-cell aluminum foam was successfully fabricated using the AA6061 alloy via friction stir processing with titanium hydride as a blowing agent and alumina (Al<sub>2</sub>O<sub>3</sub>) as a stabilizing agent. The influence of Al₂O₃ addition, ranging from 4 to 10 wt%, on the foam’s density, pore morphology, and mechanical properties was systematically investigated. Foams with Al₂O₃ content from 4 to 10 wt% exhibited densities from 1.08 to 0.64&#xa0;g/cm<sup>3</sup>, with higher Al₂O₃ content promoting a more uniform pore distribution. Compressive stress–strain analysis revealed a decrease in plateau stress from 52.96 ± 2&#xa0;to 30.68 ± 1.8&#xa0;MPa and energy absorption capacity from 24 ± 1.6 to 13 ± 1.9&#xa0;J/cm<sup>3</sup> as density decreased with increasing Al₂O₃. Microhardness results showed that while Al₂O₃ addition slightly increased cell wall hardness from 58.0 ± 0.6 to 63.5 ± 0.9 HV. This study demonstrates that Al₂O₃ additions up to 10 wt% can effectively enhance pore distribution, homogeneity, and mechanical properties, suggesting its potential for energy-absorbing applications.</p>

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Influence of Al₂O₃ Additives on Mechanical Properties and Energy Absorption in Closed-Cell Aluminum Foam Fabricated via Friction Stir Processing

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Deeksha Lohani,
  • B. S. S. Daniel

摘要

In this study, the closed-cell aluminum foam was successfully fabricated using the AA6061 alloy via friction stir processing with titanium hydride as a blowing agent and alumina (Al2O3) as a stabilizing agent. The influence of Al₂O₃ addition, ranging from 4 to 10 wt%, on the foam’s density, pore morphology, and mechanical properties was systematically investigated. Foams with Al₂O₃ content from 4 to 10 wt% exhibited densities from 1.08 to 0.64 g/cm3, with higher Al₂O₃ content promoting a more uniform pore distribution. Compressive stress–strain analysis revealed a decrease in plateau stress from 52.96 ± 2 to 30.68 ± 1.8 MPa and energy absorption capacity from 24 ± 1.6 to 13 ± 1.9 J/cm3 as density decreased with increasing Al₂O₃. Microhardness results showed that while Al₂O₃ addition slightly increased cell wall hardness from 58.0 ± 0.6 to 63.5 ± 0.9 HV. This study demonstrates that Al₂O₃ additions up to 10 wt% can effectively enhance pore distribution, homogeneity, and mechanical properties, suggesting its potential for energy-absorbing applications.