|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Unique Deformation Mechanisms in Mg-Y from In Situ Mechanical Test
||Leyun Wang, Julian Sabisch, Erica Lilleodden
|On-Site Speaker (Planned)
Deformation of Mg-2.5 wt%Y cast alloy was studied by in situ optical microscopy and ex situ electron backscattered diffraction (EBSD). Compared with pure Mg, this Mg-Y alloy is stronger and more ductile. Two unique deformation mechanisms are identified for this alloy. The first mechanism is kinking on the basal plane. Kinks can have misorientation angle up to 18° with respect to the matrix. Kink formation was accompanied by the nucleation of numerous twins at the kink boundaries. A mechanistic model of basal dislocation dissociation is proposed to account for the kink formation. The second mechanism is cross-slip between basal and prismatic planes. Critical resolved shear stress (CRSS) of prismatic slip becomes comparable with basal slip in this alloy. The experimental results will be related to recent first-principles studies on how solutes atoms affect the deformation of Mg alloys.
||Planned: EPD Congress Volume