Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 468, Issue 2141, Pages 1496-1520Publisher
ROYAL SOC
DOI: 10.1098/rspa.2011.0731
Keywords
twinning; magnesium; hexagonal close packed
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [FWP-06SCPE401]
- ARC Centre of Excellence
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In this work, we propose dislocation mechanisms for the formation of {10 $(1) over bar $1}-{10 $(1) over bar $2} double twin structures in hexagonal close packed (HCP) crystals through the nucleation of secondary twins within primary twin domains. The model considers that secondary twins associated with the most commonly observed double twin variants (i.e. type 1 and type 2) nucleate and thicken by a sequence of three distinct dissociation reactions of mixed basal dislocations. Provided that the less frequently observed double twin variants (i.e. type 3 and type 4) also form by a dislocation-based mechanism, we show that their development must proceed by a separate set of dissociation reactions involving pyramidal < c + a > slip dislocations. Mechanistic, crystallographic and energetic considerations indicate that the type 1 variant should be the most prevalent. The mechanisms proposed here would also apply to the analysis of {10 $(1) over bar $3}-{10 $(1) over bar $2} compound twins and HCP metals other than Mg that exhibit double twinning, such as titanium.
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