Thermal-softening processes in polycrystalline aluminium during hydrostatic extrusion

Abstract

The influence of extrusion ratios up to 830 on the structural changes in cold hydrostatically extruded aluminium of 99·5% purity were investigated by means of light microscopy, transmission electron microscopy, differential scanning microscopy, X-ray, and mechanical methods. The increase in temperature resulting from mechanical work is assessed. Static and dynamic structural changes were separated by quenching. A dynamic recrystallization mechanism is postulated to describe the dynamic 〈111〉 to 〈100〉 texture change.