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High-temperature strength and deformation behavior of Al6063/Al2O3 nanocomposite produced by mechanical alloying and hot extrusion

Asgharzadeh, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Ultrafine-grained (UFG) Al6063 matrix nanocomposites reinforced with nano-size Al2O3 were produced by reactive mechanical alloying and hot powder extrusion method. Microstructural studies were performed by transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). Observation of very small regions with high- and low-angle grain misorientation, i.e. grains and subgrains, showed the formation of UFG Al alloy matrix with an average grain size of ~ 0.37 μm. A uniform distribution of alumina particles with an average size of ~ 100 nm was also achieved. Compression test at various temperatures up to 450 °C was carried out to evaluate the high-temperature strength and hot deformation behavior of the nanocomposite. Formation of highly misoriented and equiaxed grains revealed that dynamic recrystallization (DRX) occurred during hot deformation. While geometrical DRX was more effective at lower deformation temperature, discontinuous DRX had the main role in the softening at higher temperatures
  4. Keywords:
  5. Hot deformation ; Nanocomposite ; Alumina ; Compression testing ; Deformation ; Dynamic recrystallization ; Hot working ; Mechanical alloying ; Metallic matrix composites ; Nanocomposites ; Transmission electron microscopy ; Al6063 ; Deformation temperatures ; Dynamic recrystallization (DRX) ; Electron back scatter diffraction ; Grain misorientation ; High temperature strength ; Hot deformation behaviors ; Reactive mechanical alloying ; Powder metallurgy
  6. Source: Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010, 10 October 2010 through 14 October 2010 ; Volume 1 , 2010 ; 9781899072194 (ISBN)
  7. URL: https://www.epma.com/world-pm2010-proceedings/412-world-pm2010-full-density