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Physics of Metals and Metallography

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01.09.2023 | THEORY OF METALS

Atomistic Simulation of Plastic Deformations in Hydrogen-Saturated Two-Phase Al/θ' Bicrystals

verfasst von: P. A. Bezborodova, V. S. Krasnikov, A. E. Mayer

Erschienen in: Physics of Metals and Metallography | Ausgabe 9/2023

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Abstract

The influence of hydrogen atoms on the deformation behavior of Al/\(\theta {\kern 1pt} '\) bicrystals with a (001)_Al//(001)\(_{{\theta {\kern 1pt} '}}\) interphase boundary during shearing has been studied by the molecular-dynamics method. During shearing in the [100]_Al direction that is parallel to the (001)_Al plane, the initial emission of dislocations from the interphase boundary leads to the development of gliding along the boundary with the formation of a disordered layer of atoms in aluminum. The critical stress of activation of the plastic relaxation reaches 6.4 GPa in this case. With a shear of [100](010)_Al, the plastic relaxation occurs due to the generation and gliding of dislocations in aluminum, as well as a plastic flow in a layer of the \(\theta {\kern 1pt} '\) phase; in this case, plastic relaxation is activated at a shear stress of 7.9 GPa. Introducing hydrogen into the system leads to a decrease in the critical stresses by on average 34% due to a significant decrease in the shear resistance of the \(\theta {\kern 1pt} '\)-phase material. Systems with hydrogen demonstrated greater sensitivity to a decrease in the straining rate; a 20-fold decrease in the straining rate is accompanied by a 20% decrease in the critical stresses, while for bicrystals without hydrogen, a similar decrease is 5%. A temperature increase leads to a decrease in the critical stresses with an average temperature sensitivity coefficient of –4 MPa/K.

Vorheriger Artikel Modeling of the Atomic Structure in the Vicinity of Spherical Voids in Aluminum and the Calculation of Anisotropy of the Void Growth Rate

Nächster Artikel Structure and Magnetic Properties of Gd2O3 Nanoparticles Synthesized by Spark Discharge

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Titel: Atomistic Simulation of Plastic Deformations in Hydrogen-Saturated Two-Phase Al/θ' Bicrystals
verfasst von: P. A. Bezborodova
V. S. Krasnikov
A. E. Mayer
Publikationsdatum: 01.09.2023
Verlag: Pleiades Publishing
Erschienen in: Physics of Metals and Metallography / Ausgabe 9/2023
Print ISSN: 0031-918X
Elektronische ISSN: 1555-6190
DOI: https://doi.org/10.1134/S0031918X23601580

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