|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Processing of Nanostructured Powders and Nanopowders by Consolidation
||Dynamic Cu Grain Growth of Mechanically Milled Nanostructured Cu-5vol.%Al2O3 Powder Particles during Hot Extrusion
||Dengshan Zhou, Deliang Zhang, Paul Munroe, Charlie Kong, Wei Zeng
|On-Site Speaker (Planned)
We report the microstructural evolution of mechanically milled nanostructured Cu-5vol.%Al2O3 powder particles during 6 minute static annealing and extrusion at temperatures ranging from 300 to 600oC. After annealing at 300 or 400oC, the average sizes ofCu grains and Al2O3nanoparticles of the as-milled powder particles remained nearly unchanged, while annealing at500or 600oC caused partial recrystallization and limited grain growth of the Cu matrix and clear coarsening of Al2O3nanoparticles. The dislocation density of the extruded samples was much lower that of the annealed powders and changed slightly with increasing extrusion temperature.TheAl2O3nanoparticles in the extruded samples showed less coarsening in comparison with those in the annealed powders, dynamic recrystallization and rapid grain growthof the Cu matrix occurred during extrusion even for a relatively low extrusion temperature of300oC. The dynamic recrystallization and rapid grain growth of the Cu matrix during extrusion is strain induced and maybe associated with grainboundary migration and grainrotation.
||Planned: A print-only volume