Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 135, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2020.102778
Keywords
HCP; Twin nucleation; Rare-earth alloy; Stored energy density; Variant selection; Crystal plasticity
Funding
- Engineering and Physical Sciences Research Council through the DARE programme [EP/L025213/1]
- Imperial College President's generous PhD scholarship
- Royal Academy of Engineering/Rolls-Royce research chair funding
- EPSRC [EP/L025213/1] Funding Source: UKRI
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Extension twin nucleation and variant selection in magnesium alloy WE43 is investigated in experimentally characterised and deformed microstructures replicated in crystal plasticity models. Total stored (dislocation) energy density is found to identify the experimentally observed locations of twins which are not otherwise explained by global Schmid factors or local resolved shear stress criteria. A critical total stored energy of the order 0.015 Jm(2) is determined below which twin nucleation does not occur. The total stored energy density explains the locations of the observed twins and the absence of twins in parent grains anticipated to be favourable for twin nucleation. Twin variant selection has been shown to be driven by minimising locally stored shear energy density, while the geometric compatibility and strain compatibility factors only aid in partial prediction. All experimentally observed variants were correctly determined.
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