Precipitation strengthening as a collective multi-dislocation phenomenon
Abstract
Precipitation strengthening is a cornerstone of physical metallurgy, delivering otherwise unattainable combinations of strength and ductility. The approach relies on nanoscale precipitates that impede the motion of dislocations, the primary carriers of metal plasticity. Historically, precipitation strengthening has been rationalized via two idealized, limiting mechanisms: dislocations either cut through or bow around precipitates. However, under many technologically relevant conditions, multiple dislocations can interact with a precipitate at the same time, potentially giving rise to distinct precipitate-dislocation dynamics that in situ experiments are yet to fully resolve. Here, using large-scale atomistic simulations (100 million atoms) that capture these dynamics, we demonstrate that in this regime, the cutting-versus-bowing dichotomy is incomplete: strengthening arises as an emergent phenomenon driven by concurrent multi-dislocation interactions. These interactions simultaneously induce dislocation accumulation at interfaces, storage within precipitates, and precipitate-mediated multiplication inside the matrix. Our findings establish a distinct mechanistic regime of precipitation strengthening beyond traditional models and provide a quantitative foundation for predicting its behavior.
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BibTeX
@misc{islam2026precipitation,
title = {{Precipitation strengthening as a collective multi-dislocation phenomenon}},
author = {Mahmudul Islam and Jason Ogbebor and Nicolas Bertin and Sylvie Aubry and Vasily V. Bulatov and Rodrigo Freitas},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.14890},
eprint = {2606.14890},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.14890},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Precipitation strengthening as a collective multi-dislocation phenomenon
AU - Mahmudul Islam
AU - Jason Ogbebor
AU - Nicolas Bertin
AU - Sylvie Aubry
AU - Vasily V. Bulatov
AU - Rodrigo Freitas
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2606.14890
UR - https://arxiv.org/abs/2606.14890
AB - Precipitation strengthening is a cornerstone of physical metallurgy, delivering otherwise unattainable combinations of strength and ductility. The approach relies on nanoscale precipitates that impede the motion of dislocations, the primary carriers of metal plasticity. Historically, precipitation strengthening has been rationalized via two idealized, limiting mechanisms: dislocations either cut through or bow around precipitates. However, under many technologically relevant conditions, multiple dislocations can interact with a precipitate at the same time, potentially giving rise to distinct precipitate-dislocation dynamics that in situ experiments are yet to fully resolve. Here, using large-scale atomistic simulations (100 million atoms) that capture these dynamics, we demonstrate that in this regime, the cutting-versus-bowing dichotomy is incomplete: strengthening arises as an emergent phenomenon driven by concurrent multi-dislocation interactions. These interactions simultaneously induce dislocation accumulation at interfaces, storage within precipitates, and precipitate-mediated multiplication inside the matrix. Our findings establish a distinct mechanistic regime of precipitation strengthening beyond traditional models and provide a quantitative foundation for predicting its behavior.
ER -