Investigating twin boundary-dislocation interaction in MgY using quasi in-situ nanoindentation and electron channeling contrast imaging
Abstract
Defect–grain boundary interactions have been proven essential for the development of tailored microstructures for high-performance materials. We aim to unravel the mechanical response of grain boundaries by investigating dislocation activity in the vicinity of a tensile twin boundary (TB) in Mg–Y. A combined approach of quasi in-situ nanoindentation, electron channeling contrast imaging (ECCI), and HR-EBSD was employed to induce localized deformation and analyze the resulting TB response. Indentation in the parent grain near the TB produced distinct pop-ins, indicating deformation events close to the boundary. Observed slip included non-basal activity in the twin and prismatic slip in the parent grain. Dislocation pile-ups caused TB bulging rather than transmission, consistent with low slip transmission factors. However, limited slip transmission is observed. Peach–Koehler force calculations based on HR-EBSD measurements confirm stress-induced TB motion.
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BibTeX
@article{mouhib2026investigating,
title = {{Investigating twin boundary-dislocation interaction in MgY using quasi in-situ nanoindentation and electron channeling contrast imaging}},
author = {Fatim Zahra Mouhib and Hexin Wang and Julien Guénolé and Stéphane Berbenni and Talal Al Samman and Thiebaud Richeton and Zhuocheng Xie and Antoine Guitton},
journal = {Journal of Magnesium and Alloys},
year = {2026},
month = oct,
doi = {10.1016/j.jma.2026.102205},
url = {https://hal.univ-lorraine.fr/hal-05304214v2},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Investigating twin boundary-dislocation interaction in MgY using quasi in-situ nanoindentation and electron channeling contrast imaging
AU - Fatim Zahra Mouhib
AU - Hexin Wang
AU - Julien Guénolé
AU - Stéphane Berbenni
AU - Talal Al Samman
AU - Thiebaud Richeton
AU - Zhuocheng Xie
AU - Antoine Guitton
PY - 2026
DA - 2026/10/15
JO - Journal of Magnesium and Alloys
DO - 10.1016/j.jma.2026.102205
UR - https://hal.univ-lorraine.fr/hal-05304214v2
AB - Defect–grain boundary interactions have been proven essential for the development of tailored microstructures for high-performance materials. We aim to unravel the mechanical response of grain boundaries by investigating dislocation activity in the vicinity of a tensile twin boundary (TB) in Mg–Y. A combined approach of quasi in-situ nanoindentation, electron channeling contrast imaging (ECCI), and HR-EBSD was employed to induce localized deformation and analyze the resulting TB response. Indentation in the parent grain near the TB produced distinct pop-ins, indicating deformation events close to the boundary. Observed slip included non-basal activity in the twin and prismatic slip in the parent grain. Dislocation pile-ups caused TB bulging rather than transmission, consistent with low slip transmission factors. However, limited slip transmission is observed. Peach–Koehler force calculations based on HR-EBSD measurements confirm stress-induced TB motion.
SN - 2213-9567
ER -