Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8003559 | Journal of Alloys and Compounds | 2012 | 7 Pages |
Abstract
An equiaxed, submicron grain size distribution was generated in an Al(0.1 wt.% Sc) alloy by processing through equal channel angular pressing followed by a low temperature pre-ageing heat treatment. The alloy was subsequently annealed for various times at 300, 350, 400 and 450 °C for investigating the thermal stability of the deformation microstructure. It was found that up to 400 °C, the submicron grain structure coarsens slowly and uniformly by a process of continuous recrystallization. Within this temperature range, the uniform dispersion of nano-sized Al3Sc particles generated by the pre-ageing treatment substantially hinders grain coarsening by Zener pinning of the (sub)grain boundaries. At the higher annealing temperature of 450 °C, certain grains were found to grow discontinuously thereby generating a mixed microstructure consisting of both fine and coarse grains. The data in this study was combined with recent data for a higher solute Al(0.3 wt.% Sc) alloy for furthering our understanding of the time and temperature range in which this family of alloys is resistant to rapid, discontinuous grain coarsening (recrystallization).
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A. Bommareddy, M.Z. Quadir, M. Ferry,