Journal
ACTA MATERIALIA
Volume 86, Issue -, Pages 254-268Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.12.003
Keywords
Magnesium alloys; Crystal plasticity; In situ diffraction; Deformation behavior; Texture
Funding
- Deutsche Forschungsgemeinschaft (DFG) [RE 688/67-1]
- US National Science Foundation [CMMI-1301081]
- Laboratory Directed Research and Development [20140348ER]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1301081] Funding Source: National Science Foundation
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The effects of alloying additions and grain size on the deformation behavior of two extruded Mg-4 wt.% Li and Mg-4 wt.% Li-1 wt.% Al alloys were studied. To determine the underlying deformation mechanisms, we employed a combination of texture analysis, in situ energy dispersive X-ray synchrotron diffraction and elasto-plastic self-consistent modeling. We show that both alloys exhibit two uncommon features: (1) low tension compression asymmetry in yield strength and (2) a so-called positive asymmetry in which the compression yield strength is higher than the tension yield strength. Our analyses suggest that this unusual asymmetry arises because the addition of Li hinders the activation of {10 (1) over bar2}< 10 (1) over bar(1) over bar > tension twinning. We also show that the increases in the yield stress and hardening rate with the addition of Al is a consequence of increases in the resistances to slip but a decrease in the resistance to {10 (1) over bar2}< 10 (1) over bar(1) over bar > twinning. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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