Journal
SCRIPTA MATERIALIA
Volume 190, Issue -, Pages 63-68Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.08.031
Keywords
Hydrogen cluster; Semi-coherent interface; Dislocation nucleation; Interface sliding
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Funding
- National key Research and Development Program of China [2017YFB0702100, 2018YFA0702100, 2018YFB0703600]
- National Natural Science Foundation of China [51601005, 51672015, U1601213]
- Beijing Natural Science Foundation [2182032]
- 111 Project [B17002]
- National Thousand Young Talents Program of China
- Fundamental Research Funds for the Central Universities
- European Regional Development Fund in the IT4Innovations national supercomputing center -path to exascale project within the Operational Programme Research, Development and Education [CZ.02.1.01/0.0/0.0/16_013/0001791]
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This study found that the position of hydrogen clusters has a significant impact on dislocation nucleation and interface sliding in metallic nanocomposites, providing a rational atomistic mechanism for the effect of hydrogen clusters on interface facilitated plasticity.
Dislocation nucleation and interface sliding are two dominant plasticity events governing the mechanical behavior of metallic nanocomposites. Recent works have shown that both events can be closely related to atomistic interface geometries, however, how compositional factors, e.g., segregated hydrogen clusters, contribute both events are nearly unknown. Herein, we demonstrate that hydrogen clusters near misfit dislocation nodes can strongly suppress dislocation nucleation and interface sliding, while clusters at other positions will contribute somehow weaker effect on dislocation nucleation but facilitate interface sliding. These findings offer a rational atomistic mechanism for the effect of hydrogen clusters on interface facilitated plasticity. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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