Stress-driven triple junction reconstruction facilitates cooperative grain boundary deformation
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Related Research Unit(s)
Detail(s)
Original language | English |
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Article number | 120565 |
Journal / Publication | Acta Materialia |
Volume | 283 |
Online published | 12 Nov 2024 |
Publication status | Published - 15 Jan 2025 |
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Abstract
Triple junctions (TJs), essential components linking neighboring grain boundaries (GBs), are of great significance for the deformation of entire GB networks in polycrystalline materials. However, kinetic behaviors of TJs and their coupling with GB plasticity remain largely unexplored, especially at atomic scale. Using atomistic in situ nanomechanical testing, we reveal a regime of dynamic TJ reconstruction for accommodating the coordinated deformation of GB network in gold and platinum polycrystals, proceeding through different modes of structural transformations, including disordered atomic arrangement, subgrain, dense stacking faults, and nanotwins. Such TJ reconstruction preferentially nucleates at TJs predicted with strong dragging effect, which serves as an effective route to facilitate the cooperative motion of neighboring GBs, in contrast to the widely-believed TJ deformation in steady state. This reconstruction-coordinated TJ kinetics provides novel insights into complicated GB network evolution and calls for a revisit of TJ roles in polycrystalline materials. © 2024 Acta Materialia Inc.
Research Area(s)
- Coordinated deformation, Deformation twin, Grain boundary, In situ transmission electron microscopy (TEM), Polycrystalline materials, Triple junction reconstruction
Citation Format(s)
Stress-driven triple junction reconstruction facilitates cooperative grain boundary deformation. / Chen, Yingbin; Zhu, Qi; Han, Jian et al.
In: Acta Materialia, Vol. 283, 120565, 15.01.2025.
In: Acta Materialia, Vol. 283, 120565, 15.01.2025.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review