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Extended core of twinning disconnection associated with { 112¯2} twinning
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DOI：10.1016/j.actamat.2026.122326.png)
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Abstract
En 中文
{ 112¯2} twinning is widely activated in α-titanium (α-Ti) to accommodate the strain along the c-axis. The short, three-layer height bands are observed along { 112¯2} twin boundary, but the formation mechanism and atomic structure of these bands are in debate. In this work, we characterized atomic structure of these bands by using high-angle annular dark-field scanning transmission electron microscopy. Combining with topological analysis and first-principles density functional theory calculations, our conclusion is that these bands have a distorted ω-phase structure. The formation of the distorted ω-structure can be treated as the dissociations of a three-layer twinning disconnection (b3, 3h{112¯2}), where a leading partial disconnection (1/2b3, 3h{112¯2}) and a trialing partial disconnection (1/2b3, 3h{112¯2}) are bounded by a distorted ω-structure. Correspondingly, we proposed possible mechanisms for twin thickening via partial disconnections. These findings enhance the fundamental understanding of twinning behavior in hexagonal metals.
Keywords:
{112¯2} twinning
twinning disconnection
distorted ω-phase
atomic structure
hexagonal metals
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9.3
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12.9W
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