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<p>The present research aims to synthesize and characterize high specific strength aluminium matrix nanocomposites (AMNCs) for lightweight, high-strength applications. Alumina nanoparticles were synthesized using an inorganic sol–gel process. In this process, Aluminium chloride and ethanol were mixed together followed by addition of ethyl acetoacetate and continuous stirring for long duration. The synthesised powder materials were calcinated at three different temperatures; 800, 1000 and 1200&#xa0;°C. The AMNCs were fabricated using the powder metallurgy process by adding 0.5, 0.75, and 1.0 wt% alumina nanoparticles to pure aluminium. The compacted specimens were then sintered at 350&#xa0;°C, 500&#xa0;°C, and 600&#xa0;°C for 2&#xa0;h in a high-temperature programmable tube furnace. Physical characterization of the alumina powder was carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM) with EDS, and a particle size analyzer. The microstructures of the fabricated AMNCs were observed and grain sizes were measured following ASTM E112. The hardness of the AMNCs was evaluated using a Vickers microhardness tester. The mechanical properties of the AMNCs were also compared with those of aluminium matrix composites (AMCs) reinforced with 5, 7.5, and 10 wt% as-received Al<sub>2</sub>O<sub>3</sub>. It was observed that nano-sized Al<sub>2</sub>O<sub>3</sub> formed through the sol–gel technique; however, more refined nano-Al<sub>2</sub>O<sub>3</sub> particles were obtained at a calcination temperature of 1200&#xa0;°C compared to 800 and 1000&#xa0;°C. The FESEM images were confirmed the spherical morphology of synthesized nano-Al<sub>2</sub>O<sub>3</sub> powder materials irrespective of calcination temperature. It was also interestingly observed that the mechanical properties of AMNCs were significantly improved compared to those of AMCs, regardless of the weight percentage of reinforcement and sintering temperature in the powder metallurgy process. However, the mechanical properties of both AMNCs and AMCs increased with an increase in either the reinforcement content or the sintering temperature.</p>

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Effect of Calcination Temperature on the Structural Evolution of Nano-Al2O3 and Their Resulting Influence on Microstructure and Mechanical Properties of AMNCs

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Akriti Goswami,
  • Sanjay Kumar,
  • Srinivasarao Naik B.,
  • Md. Basiruddin SK,
  • Jayanta Kumar Mahato

摘要

The present research aims to synthesize and characterize high specific strength aluminium matrix nanocomposites (AMNCs) for lightweight, high-strength applications. Alumina nanoparticles were synthesized using an inorganic sol–gel process. In this process, Aluminium chloride and ethanol were mixed together followed by addition of ethyl acetoacetate and continuous stirring for long duration. The synthesised powder materials were calcinated at three different temperatures; 800, 1000 and 1200 °C. The AMNCs were fabricated using the powder metallurgy process by adding 0.5, 0.75, and 1.0 wt% alumina nanoparticles to pure aluminium. The compacted specimens were then sintered at 350 °C, 500 °C, and 600 °C for 2 h in a high-temperature programmable tube furnace. Physical characterization of the alumina powder was carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM) with EDS, and a particle size analyzer. The microstructures of the fabricated AMNCs were observed and grain sizes were measured following ASTM E112. The hardness of the AMNCs was evaluated using a Vickers microhardness tester. The mechanical properties of the AMNCs were also compared with those of aluminium matrix composites (AMCs) reinforced with 5, 7.5, and 10 wt% as-received Al2O3. It was observed that nano-sized Al2O3 formed through the sol–gel technique; however, more refined nano-Al2O3 particles were obtained at a calcination temperature of 1200 °C compared to 800 and 1000 °C. The FESEM images were confirmed the spherical morphology of synthesized nano-Al2O3 powder materials irrespective of calcination temperature. It was also interestingly observed that the mechanical properties of AMNCs were significantly improved compared to those of AMCs, regardless of the weight percentage of reinforcement and sintering temperature in the powder metallurgy process. However, the mechanical properties of both AMNCs and AMCs increased with an increase in either the reinforcement content or the sintering temperature.