Synthesis of an Al/Al2O3 composite by severe plastic deformation

摘要: Abstract The influence of severe plastic deformation on fabrication an aluminum/alumina composite made from pre-sintered Al powders was evaluated. Spherical powder particles with diameters up to 45 μm were pre-compacted using cold isostatic pressing (CIP), subsequently vacuum sintered for 60 min at 500 °C, and subjected processing either 4 passes swaging or 1 10 revolutions high pressure torsion (HPT). For all the samples we calculated average strain measured microhardness. Results showed increase in microhardness imposed strain. However, values uniformity also influenced by possible residual porosity. smallest most uniform grain size achieved processed HPT, especially after (average diameter 0.22 μm). Residual porosity completely eliminated only HPT revolutions. Texture evaluations 〈111〉 fiber texture development swaging, while orientations more random.