|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Microstructural and Texture Transitions Observed Using Shear Assisted Processing and Extrusion (ShAPE) of Melt Spun AZ91E Precursors
||Nicole Overman, Scott Whalen, Matt Olszta, Karen Kruska, Jens Darsell, Vineet Joshi, Hellen Jiang, Suveen Mathaudhu
|On-Site Speaker (Planned)
Processing improvements for lightweight structural materials are at the forefront of vehicle technologies development. For these reasons, a unique processing methodology has been explored. Consolidation of melt spun AZ91E flake precursor material was accomplished using Shear Assisted Processing and Extrusion (ShAPE). Microstructural evolution was evaluated at various stages of processing. Compositional segregation and grain growth were seen during consolidation, followed by grain refinement, homogenization of second phases and basal texture development during extrusion. Scanning and transmission electron microscopy were used to evaluate the formation and distribution of enriched Al-Mn and Al-Zn second phases. Interestingly, the equilibrium Mg17Al12 phase was not seen despite the higher temperatures (~450°C) involved during processing. The unique phases identified are likely a result of far-from-equilibrium precursors. Hardness testing of the extrudate indicated structural uniformity. As a result, ShAPE processing coupled with rapid solidification was shown to produce materials with novel second phase compositions and crystallographic texture.
||Planned: Supplemental Proceedings volume