|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Dynamic Precipitation in a Mg-9wt.%Al Alloy during Low-temperature Equal Channel Angular Extrusion (ECAE)
||Xiaolong Ma, Suhas Eswarappa-Prameela, Nicholas Krywopusk, Laszlo J. Kecskes, Timothy P. Weihs
|On-Site Speaker (Planned)
Conventional aging in Mg-Al alloys produces precipitates which are dominated by high aspect-ratio plates or laths that inhabit the basal planes of α-Mg crystals. These precipitates are believed to be ineffective at blocking basal slips during deformation, and thus result in little strengthening. Herein, we report a dynamic precipitation phenomenon in a Mg-9wt.%Al alloy during equal channel angular extrusion (ECAE) at relatively low temperature. This process leads to a high number density of nanoscale, low aspect-ratio precipitates that have the potential for significant strengthening in Mg alloys. Samples are warm rolled and solutionized to create strong texture; and then extruded using ECAE with various sample orientations. After processing, we used TEM to characterize the size, geometry, and distribution of the precipitates, as well as their interfacial relationship with α-Mg matrix. The impact of mechanical processing on the kinetics of nucleation and growth of precipitates will be considered.
||Planned: Supplemental Proceedings volume