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Enhanced plasticity in CrCoNi medium entropy alloy via twin boundary migration-sliding coupling achieved by twin-twin interactions
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DOI：10.1016/j.ijplas.2026.104774.png)
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Abstract
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• In situ TEM micro-tensile experiments reveal orientation-dependent plastic deformation pathways in single-crystalline CrCoNi medium-entropy alloys. • Twin boundary migration (TBM) and twin boundary sliding (TBS) are directly distinguished and shown to operate sequentially or cooperatively depending on local deformation conditions. • A cooperative TBM–TBS deformation mode is identified and enabled by local stress concentration effects beyond crystallographic orientation constraints. • Twin–twin interactions are revealed to play a dual role in activating and stabilizing TBM–TBS coupling, enabling sustained plastic strain accommodation.
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