Zonal dislocations in Laves phases: A coupled synchro-shear slip mechanism
Abstract
Synchro-shear is the primary plastic deformation mechanism in Laves phases at elevated temperatures, mediated by synchro-Shockley partial dislocations-zonal dislocations that proceed via localized events such as kink-pair nucleation and propagation. Using atomistic simulations, we identified a novel slip mechanism in Laves phases, namely coupled synchro-shear slip, involving the synchronized glide of two synchro-Shockley partial dislocations on adjacent slip planes, leading to the formation of extrinsic stacking faults. High-resolution scanning transmission electron microscopy revealed the extended core structures consistent with coupled synchro-Shockley partial dislocations bounded by extrinsic stacking faults in C15 NbCr2 and their involvement in twinning. These results highlight the critical role of coupled synchro-shear slip in enabling phase transformations between Laves polytypes and in governing twinning behavior, providing new atomistic insight into the kinetic nature of plasticity in topologically close-packed intermetallic phases.
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BibTeX
@misc{lee2026zonal,
title = {{Zonal dislocations in Laves phases: A coupled synchro-shear slip mechanism}},
author = {Sang-Hyeok Lee and Mariano Forti and Thomas Hammerschmidt and Gang Liu and Julien Guénolé and Siyuan Zhang and Gerhard Dehm and Sandra Korte-Kerzel and Zhuocheng Xie},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.06198},
eprint = {2609.06198},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.06198},
}
RIS
TY - UNPB
TI - Zonal dislocations in Laves phases: A coupled synchro-shear slip mechanism
AU - Sang-Hyeok Lee
AU - Mariano Forti
AU - Thomas Hammerschmidt
AU - Gang Liu
AU - Julien Guénolé
AU - Siyuan Zhang
AU - Gerhard Dehm
AU - Sandra Korte-Kerzel
AU - Zhuocheng Xie
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2609.06198
UR - https://arxiv.org/abs/2609.06198
AB - Synchro-shear is the primary plastic deformation mechanism in Laves phases at elevated temperatures, mediated by synchro-Shockley partial dislocations-zonal dislocations that proceed via localized events such as kink-pair nucleation and propagation. Using atomistic simulations, we identified a novel slip mechanism in Laves phases, namely coupled synchro-shear slip, involving the synchronized glide of two synchro-Shockley partial dislocations on adjacent slip planes, leading to the formation of extrinsic stacking faults. High-resolution scanning transmission electron microscopy revealed the extended core structures consistent with coupled synchro-Shockley partial dislocations bounded by extrinsic stacking faults in C15 NbCr2 and their involvement in twinning. These results highlight the critical role of coupled synchro-shear slip in enabling phase transformations between Laves polytypes and in governing twinning behavior, providing new atomistic insight into the kinetic nature of plasticity in topologically close-packed intermetallic phases.
ER -