|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Phase Transformations and Microstructural Evolution
|The Effect of Grain Size on Quasi-static and Dynamic Strength
|Jenna Krynicki, Laszlo J. Kecskes, Christopher S. DiMarco, Jake Diamond, Zhigang Xu, K.T. Ramesh, Timothy P. Weihs
|On-Site Speaker (Planned)
The use of lightweight metals in structural applications has sparked revived interest in Mg alloys, as they can offer high specific strengths. Under extreme, high-rate loading conditions, spall strength and dynamic strength determine performance. In such applications, attempts to strengthen Mg alloys with precipitates may prove ineffective as second phase particles can serve as void nucleation sites that decrease spall strength. Therefore, we focus on grain refinement with a minimal number of precipitates, using a Mg-1Zn-0.2Ca (wt%) alloy as an alternative to precipitation strengthening. The alloy was first processed via Equal Channel Angular Extrusion (ECAE) to refine the grain size to ~5 microns; subsequently, samples were then annealed to generate grain sizes of ~25 and 80 microns. We report on the resulting microstructures, identifying corresponding grain size distributions and texture. Additionally, we compare the quasi-static and dynamic mechanical behavior of these samples, as a function of grain size.