Scholarlink

<p>Aluminum-based metal matrix composites (MMCs) are widely recognized for their superior mechanical and electrical properties, making them suitable for advanced engineering applications. In this study, nanocomposites were synthesized from Al and 20 wt.% WO<sub>3</sub> powder mixtures using powder metallurgy techniques. High-energy ball milling (HEBM) was employed for varying durations, followed by compaction and sintering at 600°C under an argon atmosphere. During processing, WO<sub>3</sub> underwent in situ chemical transformations, leading to the formation of tungsten (W), tungsten aluminide (WAl<sub>12</sub>), and nanostructured aluminum oxide (Al<sub>2</sub>O<sub>3</sub>). Structural characterization via X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) confirmed the presence and distribution of these phases. Rietveld refinement revealed that W nanoparticles constituted approximately 10 wt.%, while WAl<sub>12</sub> reached up to 7 wt.% after 30 hours of milling. The uniformly dispersed Al<sub>2</sub>O<sub>3</sub> phase contributed to enhanced composite performance. Extending the milling time to 40 hours significantly improved mechanical and electrical properties, with hardness increasing from 31 HV to 157 HV and electrical resistivity decreasing from 186 μΩ · m to 40 μΩ · m. These results underscore the critical role of in situ phase formation and nanoscale phase distribution in optimizing the functional properties of Al-based nanocomposites.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Microstructural Refinement and Functional Property Enhancement in Al Matrix Nanocomposites Via Reactive Milling of Al–WO3 Powders

  • 期刊论文

  • 发表日期：

    2025年9月1日

查看全文
  • Emad M. Ahmed

摘要

Aluminum-based metal matrix composites (MMCs) are widely recognized for their superior mechanical and electrical properties, making them suitable for advanced engineering applications. In this study, nanocomposites were synthesized from Al and 20 wt.% WO3 powder mixtures using powder metallurgy techniques. High-energy ball milling (HEBM) was employed for varying durations, followed by compaction and sintering at 600°C under an argon atmosphere. During processing, WO3 underwent in situ chemical transformations, leading to the formation of tungsten (W), tungsten aluminide (WAl12), and nanostructured aluminum oxide (Al2O3). Structural characterization via X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) confirmed the presence and distribution of these phases. Rietveld refinement revealed that W nanoparticles constituted approximately 10 wt.%, while WAl12 reached up to 7 wt.% after 30 hours of milling. The uniformly dispersed Al2O3 phase contributed to enhanced composite performance. Extending the milling time to 40 hours significantly improved mechanical and electrical properties, with hardness increasing from 31 HV to 157 HV and electrical resistivity decreasing from 186 μΩ · m to 40 μΩ · m. These results underscore the critical role of in situ phase formation and nanoscale phase distribution in optimizing the functional properties of Al-based nanocomposites.