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Unusual twin distribution of layered titanium upon cryogenic bending
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DOI：10.1016/j.scriptamat.2026.117379.png)
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Abstract
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Deformation twinning, which normally intensifies with increasing strains, is a common plasticity mechanism in hexagonal metals. Here, we report an anomalous “high-strain, low-twinning” phenomenon during cryogenic bending of layered titanium. Through quasi in situ experiments and crystal plasticity simulations, we demonstrate that a multiaxial stress state developed at the notch tip disperses stress components, thereby suppressing twin nucleation and promoting prismatic slip. This stress-state-controlled paradigm, validated at both 77 K and 298 K, reveals a key mechanistic insight for potentially tailoring deformation modes in layered metals via stress-state engineering.
Keywords:
deformation twinning
cryogenic bending
layered titanium
stress-state engineering
crystal plasticity simulation
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