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Constitutive Analysis and Microstructural Evolution in Hot Working of Nanostructured Al6063

  • : Asgharzadeh, H1
  • : 1University of Tabriz
  • : PDF Download
  • : 2012

Abstract

Flow curves and microstructural changes of nanostructured Al6063 alloy produced by mechanical alloying followed by hot extrusion were investigated by means of uniaxial compression test in the temperature range between 300 and 450 ?C and strain rate range between 10-2 and 1 s-1. The analysis of flow curves were performed by a hyperbolic sine law equation and the stress exponent and activation energy were determined to be 2.9 and 228 kJ mol-1, respectively. The microstructural constituents for elaboration of deformation mechanisms were observed by TEM and EBSD under FEG-SEM. The microstructural observations determine that dynamic recovery through the formation of subgrains within the grains and dynamic recrystallization via formation of recrystallized grains occurred during hot deformation of nanostructured Al6063. Coarsening of the subgrains and grain growth upon deformation was monitored and related to Zener-Hollomon parameter.
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