Journal
ACTA MATERIALIA
Volume 59, Issue 5, Pages 1945-1956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.11.060
Keywords
Magnesium alloys; Twinning; Extrusion; Modelling
Funding
- UK Royal Academy of Engineering
- Engineering and Physical Sciences Research Council [EP/H020047/1] Funding Source: researchfish
- EPSRC [EP/H020047/1] Funding Source: UKRI
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The predicted strengthening effect of precipitates of different shape and habit on the basal, prismatic and {1 0 (1) over bar 2} twinning deformation systems in magnesium has been calculated. In parent material, rod precipitates parallel to the c-axis are predicted to be more effective than plates parallel to the basal plane in hardening the basal and prismatic slip systems. However, in twinned material, non-sheared basal plates are highly effective in inhibiting the basal slip necessary to relieve incompatibility stresses. The predictions suggest basal plates will reduce asymmetry in strongly textured extrusions by preferentially hardening against twin growth compared to prismatic slip, whereas c-axis rods can have the opposite effect. The predictions have been compared with the measured asymmetry for two magnesium alloys that form either c-axis rods (Z5) or basal plates (AZ91). In agreement with the model, it is shown that precipitation in Z5 leads to an increase in asymmetry, whereas in AZ91 precipitation reduces asymmetry. These results suggest that designed precipitation may provide a useful tool for reducing asymmetry in wrought magnesium alloys. (c) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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