|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Magnesium Technology 2021
||Accounting for the Effects of Dislocation Climb Mediated Flow in Mg alloy ZK10 Sheet
||Michael Ritzo, Sean R. Agnew
|On-Site Speaker (Planned)
A version of the viscoplastic self-consistent (VPSC) code, which accounts for the kinematics of dislocation climb, is used to model conditions where hard slip modes and twinning are also observed. Tensile samples of a Mg alloy ZK10 sheet were tested at a range of temperatures and strain rates designed to rather evenly probe a range of Zener Hollomon parameter values, from ln(Z) ≈ 15 (10-4 s-1 and 623K) up to ln(Z) ≈ 50 (10-3 s-1 and 300K). ZK10 shows modest strain anisotropy (r-value) for both 45° (r ≈ 0.84-1.2) and TD (r ≈ 0.89-1.4) sample orientations, despite the propensity for prismatic slip of <a> dislocations, which often leads to high r-values in basal textured sheets. This is explained in terms of the initial texture and mechanism activity, including twinning at both room and elevated temperature, where basal glide and climb of <a> dislocations become the dominant deformation mechanisms.