|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Understanding the Role of Cu and Clustering on Strain Hardening and Strain Rate Sensitivity of Al-Mg-Si-Cu Alloys
||Michael Langille, Bradley J Diak, Frederic De Geuser, Gilles Guiglionda, Sami Meddeb, Huan Zhao, Baptiste Gault, Dierk Raabe, Alexis Deschamps
|On-Site Speaker (Planned)
6000 series Al-Mg-Si-Cu alloys for sheet automotive applications require a high level of formability together with a high strength after paint-bake cycle. Formability relies on the combination, at strains close to necking, of the levels of strain hardening (SH) and strain rate sensitivity (SRS), both of which depend on the compositions in solute and on the cluster state, controlled by the pre-ageing treatment and the level of natural ageing. In the present study, a large range of alloy compositions with varying levels of Mg, Si and Cu have been tested with special attention given to measuring the SRS both during up- and down-changes of strain rate. The evolution of SH and SRS during straining are correlated with the state of clustering, characterized by a combination of differential scanning calorimetry, atom probe tomography and small-angle X-ray scattering. Implications of the asymmetry between up- and down-changes SRS on formability are discussed.
||Planned: Light Metals