|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Precipitation Processes and Strengthening Mechanisms in Al-Mg-Si Alloy Extruded to High Strains
||Witold Chrominski, Malgorzata Lewandowska
|On-Site Speaker (Planned)
Al-Mg-Si alloys are typically produced by hot extrusion followed by heat treatment to induce precipitation phenomena. In this study, an alternative approach was utilized to combine work and precipitation strengthening. Aluminium billets were extruded in supersaturated condition at ambient temperature and then aged. Microstructure observations allowed to correlate the precipitation sequence with local arrangement of deformation induced defects – dislocation walls or different types of grain boundaries. It was shown that precipitation order was different than observed in conventional process. However, the overall strengthening effect was much higher than usual. Quantitative microstructure analysis allowed to distinguish several mutually operative strengthening mechanisms whose superposition led to the final superior mechanical properties. According to the model proposed, the strengthening effect vary for different texture components. As a final conclusion, the most desired microstructure type in terms of mechanical properties was proposed.
||Planned: Light Metals