| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
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Progress towards Understanding the Synthesis and Behavior of Metals Far from Equilibrium: A SMD Symposium Honoring Enrique Lavernia on the Occasion of His 60th Birthday
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| Presentation Title |
From Far-from-Equilibrium Fabrication to Far-from-Equilibrium Investigation – a Case Study for Mg/Mg Alloys at EJL Lab and Beyond |
| Author(s) |
Dalong Zhang, Lin Jiang, Xin Wang, Irene J Beyerlein, Andrew M Minor, Julie M Schoenung, Subhash Mahajan, Enrique J Lavernia |
| On-Site Speaker (Planned) |
Dalong Zhang |
| Abstract Scope |
Mg-Y alloy with super-saturated solid solution was fabricated at EJL Lab using far-from-equilibrium processes, including gas atomization, hot isostatic pressing, and extrusion. Atom probe tomography (APT) revealed that the resultant alloy contained 1.6 at.% Y solid solution. The Mg-Y alloy exhibited a yield “symmetry”, in that the compressive yield stress (CYS) was nearly the same as the tensile yield stress (TYS), an uncommon and exceptional property compared to other Mg alloys. Post-mortem characterization revealed active prismatic slip and a “lack” of {10-12} deformation twins. In-situ TEM deformation on Mg-Y nano-pillars quantified the critical stresses for basal, prismatic, and pyramidal slip, confirming the multi-faceted effects of Y solid solution in enhancing non-basal slip, reducing intrinsic anisotropy in Mg, and impeding twinning. Far-from-equilibrium in-situ TEM study on pure Mg will also be discussed briefly, unveiling the peculiar behavior of pyramidal <c+a> dislocation in the absence of Y. |
| Proceedings Inclusion? |
Undecided |