|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||The Influence of Process Parameters and Thermomechanical History on Streaking Defects in AA6060 Extrusions
||Steven Babaniaris, Aiden Beer, Matthew Barnett
|On-Site Speaker (Planned)
Streaking is a common surface defect on architectural extrusions. The current study investigates the effect of processing parameters and thermomechanical history on the surface finish of a streaked AA6060 extrusion. Streaked profiles were intentionally produced via extrusion using a die with internal geometry deliberately designed to produce thermomechanical variation in specific regions of the profile geometry. Extrusions were conducted at various ram speeds and the profiles were given an anodization pre-treatment process to reveal streaking in the designated regions. Thermomechanical variation was analysed using the “ALE” code HyperXtrudeŽ. The surface profile and roughness of the treated and mill finish extrudates were analysed using optical profilometry. The presence of the streaks were associated with strain rate variability as determined by the die geometry, independent of the ram speed. Although there were no significant differences in roughness, the streaked regions of the profile were more recessed compared to the bulk regions.
||Planned: Light Metals