|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Multi-scale Investigation on Yield “Symmetry” and Reduced Strength Differential in an UFG Mg-Y Alloy
||Dalong Zhang, Lin Jiang, Xin Wang, Irene J Beyerlein, Julie M Schoenung, Mo Li, Subhash Mahajan, Enrique J Lavernia
|On-Site Speaker (Planned)
UFG Mg-2.5at.% Y alloy was produced through powder metallurgy and hot extrusion. Atom probe tomography revealed that most Y atoms are in super-saturated solid solution. EBSD mapping shows that this alloy has weakened basal texture. When deformed along the extrusion direction, yield “symmetry” and reduced strength differential are observed, which differ from conventional Mg alloys. In-situ TEM deformation was performed at the National Center for Electron Microscopy. Single-crystal nano-pillars with various crystallographic orientations were prepared using FIB. The CRSS for different slip systems, which were derived from the nano-mechanical test data, indicates that the presence of Y atoms in Mg lattice: (i) significantly increased the CRSS for basal slip; (ii) reduced the intrinsic mechanical anisotropy, where the ratio of CRSS prismatic slip and CRSS basal slip was much lower than that in pure Mg.
Note: dalong Zhang intends to participate in the Young Scientist Session.