Datasets with tag: HEDM
Dataset Description Authors Tags Published Updated Date
The dynamics of recrystallized grains during static recrystallization in a hot-compressed Mg-3.2Zn-0.1Ca wt.% alloy using in-situ far field high-energy diffraction microscopy The poor formability of rolled magnesium (Mg) alloy sheet remains a barrier to its widespread commercial use and is attributed to the strong basal texture that occurs in most mechanically processed Mg alloys. Recent attempts to successfully weaken the texture have been made using Mg-Zn-Ca alloys in combination with post-deformation annealing. The motivation for this work is to understand the evolution of the mesoscale processes that occur during annealing (specifically, static recrystallization) and lead to this texture weakening. Toward this goal, more than 1,200 recrystallized grains were studied during in-situ annealing in an 80% hot-compressed Mg-3.2Zn-0.1Ca wt.% (ZX30) alloy using far-field high-energy diffraction (ff-HEDM). The relative volume, crystallographic orientation, and position of each recrystallized grain emerging within a 1×1×0.1 mm3 volume were tracked throughout static recrystallization. These measurements were used to quantitatively measure the nucleation and growth statistics associated with recrystallized grains as a function of annealing time. The measurements reflected a highly heterogeneous process with individual grain dynamics varying wildly from the average, and they also point to relations between relative grain volume and growth rate (or more accurately, the rate of change of relative grain volume) with a peak average rate occurring early in recrystallization (at 22% recrystallized). We also explore whether a recrystallized grain's current state can be used to predict its future growth behaviors with implications for Monte Carlo simulations. Finally, we investigate whether recrystallized grains with specific orientations have preferential nucleation and/or growth, and we find that grains with a weak basal texture have a pronounced nucleation advantage that increases with annealing time, while other grain orientations have a slight growth advantage that diminishes with annealing time. Reza Roumina, Sangwon Lee, Tracy Berman, John Allison, Ashley Bucsek Magnesium Recrystallization HEDM insitu 3 years ago 5 months ago 2025-01-23 20:53:21
Characterization of recrystallized grains during static recrystallization of hot-compressed Mg-Zn-Ca alloys using in-situ far-field high-energy diffraction microscopy Although rolled magnesium (Mg) alloys generally suffer from strong crystallographic textures and poor formability, adding Ca and Zn to magnesium sheet can result in a desirably weak recrystallization texture and improved formability. In this study, we explore the effect of Zn content on the static recrystallization of three 80% hot-compressed alloys, Mg-0.5Zn-0.1Ca wt.% (ZX050), Mg-1Zn-0.1Ca wt.% (ZX10) and Mg-3.2Zn-0.1Ca wt.% (ZX30), using far-field high-energy diffraction microscopy (ff-HEDM). Individual recrystallized grains are tracked and their 3D centroid, relative volume, and grain-averaged crystallographic orientation are measured during in-situ annealing. These measurements are used to compare the kinetics and texture evolution of recrystallized grains in ZX alloys as a function of Zn content. Fully recrystallized microstructures are observed for the ZX30 and the ZX10 alloys after annealing at 230ºC and 330ªC, respectively. In contrast, only a partially recrystallized microstructure for the ZX050 alloy is observed after >1 hour of annealing at 430ºC. The recrystallized grains also show slower growth rates for ZX050 as compared to ZX10 and ZX30. We also use the results to discuss the recrystallization grain textures, as well as the correlation between orientations and the nucleation and growth rates of recrystallized grains, both as a function of annealing time and Zn content. REZA ROUMINA, Sangwon Lee, Tracy Berman, Kate Shanks, John Allison, Ashley Bucsek Magnesium Recrystallization texture HEDM insitu 1 month ago 1 day ago 2025-07-09 14:38:30