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Steps and {112-1} secondary twinning associated with {112-2} twin in titanium

Abstract : {112-2} twinning commonly takes place in α-titanium (α-Ti). High-resolution transmission electron microscopies (HRTEM) explored various steps along {112-2} coherent twin boundary. Topological model of {112-2} twin revealed twinning disconnections (TDs) that are represented by (bi, ) corresponding to a step height and a shear vector bi. Atomistic simulations were conducted to study the energies and kinetics of TDs. Combining microscopies and atomistic simulations, we concluded that (b3, ) is the elementary TD and (b1, ) is the reassembly TD. Steps observed in HRTEM thus can be treated as a reassembly of (b3, ) TDs and (b1, ) TDs. In addition, Electron Backscatter Diffraction (EBSD) maps revealed {112-2} → {112-1} double twins in α-Ti. Using two-dimensional and three-dimensional atomistic simulations, we demonstrated the nucleation of (b1, ) TD and → double twin through the interaction between basal dislocation and {112-2} twin. Our results enrich the understanding of {112-2} twinning including TDs, steps, and {112-1} secondary twins in hexagonal metals.
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https://hal.univ-lorraine.fr/hal-03124450
Contributor : Jean-Sébastien Lecomte Connect in order to contact the contributor
Submitted on : Thursday, January 28, 2021 - 5:04:34 PM
Last modification on : Wednesday, November 3, 2021 - 8:55:57 AM

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Mingyu Gong, Shun Xu, Dongyue Xie, Shujuan Wang, Jian Wang, et al.. Steps and {112-1} secondary twinning associated with {112-2} twin in titanium. Acta Materialia, Elsevier, 2019, 164, pp.776-787. ⟨10.1016/j.actamat.2018.11.019⟩. ⟨hal-03124450⟩

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