|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Heterogeneous Deformation in Polycrystalline Mg-Y by In Situ 3D-XRD
||Leyun Wang, Zhonghe Huang, Xiaoqin Zeng, Sangbong Yi, Erica Lilleodden, Peter Kenesei, Jun-Sang Park
|On-Site Speaker (Planned)
Small amount of Y solutes significantly improves the ductility of Mg alloys. This phenomenon is often attributed to non-basal slip modes becoming more active with Y solutes. On the other hand, quantitative evaluation of how Y alters the relative critical resolved shear stress (CRSS) for different slip modes is still missing. In this work, we tackle this problem by using a three dimensional X-ray diffraction (3D-XRD) technique available at the Advanced Photon Source. Polycrystalline Mg-Y tensile specimens were incrementally deformed with 3D-XRD characterization to track the evolution of individual grains, including their crystal orientation, position, and stress state. Activation of slip systems is inferred from crystal orientation change in each grain. CRSS for basal slip, prismatic slip, and pyramidal c+a slip are estimated from the analysis. For comparison, same experiment was performed for pure Mg to understand the role of Y solutes for ductility improvement.