Manufacturing of ultra-fine particle coal fly ash–A380 aluminum matrix composites with improved mechanical properties by improved ring milling and oscillating microgrid mixing

Georgios Kaisarlis, Georgios Vasiliou, Vasileios Spitas, Vassilis Inglezakis, Grigorios Itskos, Christos Spitas

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An experimental study is presented of ultra-fine coal fly ash (CFA) aluminum matrix composites produced by successive high-power ring milling of CFA, oscillating microgrid mixing of the CFA–aluminum melt, gravity casting and rapid cooling. Samples corresponding to different CFA concentrations and particle size distributions (1 μm average, or less) are produced and subjected to microstructural and mechanical characterization, including tensile, compressive, impact, hardness and wear testing. While the usual trade-off between increased strength and hardness and reduced ductility and toughness is observed, the obtained ultra-fine particle composites are confirmed to have overall improved mechanical properties compared to composites with larger size particles previously produced by ball milling.

Original languageEnglish
Pages (from-to)2630-2640
Number of pages11
JournalJournal of Materials Engineering and Performance
Issue number5
Publication statusPublished - 15 May 2019


  • A380 aluminum alloy
  • high-energy ring milling
  • mechanical testing
  • metal matrix composites
  • ultra-fine coal fly ash (CFA)

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