Relaxation mechanisms, structure and properties of semi-coherent interfaces
Abstract
In this work, using the Cu–Ni (111) semi-coherent interface as a model system, we combine atomistic simulations and defect theory to reveal the relaxation mechanisms, structure, and properties of semi-coherent interfaces. By calculating the generalized stacking fault energy (GSFE) profile of the interface, two stable structures and a high-energy structure are located. During the relaxation, the regions that possess the stable structures expand and develop into coherent regions; the regions with high-energy structure shrink into the intersection of misfit dislocations (nodes). This process reduces the interface excess potential energy but increases the core energy of the misfit dislocations and nodes. The core width is dependent on the GSFE of the interface. The high-energy structure relaxes by relative rotation and dilatation between the crystals. The relative rotation is responsible for the spiral pattern at nodes. The relative dilatation is responsible for the creation of free volume at nodes, which facilitates the nodes’ structural transformation. Several node structures have been observed and analyzed. In conclusion, the various structures have significant impact on the plastic deformation in terms of lattice dislocation nucleation, as well as the point defect formation energies.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for Materials at Irradiation and Mechanical Extremes (CMIME); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1329899
- Report Number(s):
- LA-UR-15-26388
Journal ID: ISSN 2075-4701; MBSEC7
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Metals
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 4; Journal ID: ISSN 2075-4701
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; atomistic simulations; dislocation; interface structure; nucleation; nodes; face-centered-cubic crystals
Citation Formats
Shao, Shuai, and Wang, Jian. Relaxation mechanisms, structure and properties of semi-coherent interfaces. United States: N. p., 2015.
Web. doi:10.3390/met5041887.
Shao, Shuai, & Wang, Jian. Relaxation mechanisms, structure and properties of semi-coherent interfaces. United States. https://doi.org/10.3390/met5041887
Shao, Shuai, and Wang, Jian. Thu .
"Relaxation mechanisms, structure and properties of semi-coherent interfaces". United States. https://doi.org/10.3390/met5041887. https://www.osti.gov/servlets/purl/1329899.
@article{osti_1329899,
title = {Relaxation mechanisms, structure and properties of semi-coherent interfaces},
author = {Shao, Shuai and Wang, Jian},
abstractNote = {In this work, using the Cu–Ni (111) semi-coherent interface as a model system, we combine atomistic simulations and defect theory to reveal the relaxation mechanisms, structure, and properties of semi-coherent interfaces. By calculating the generalized stacking fault energy (GSFE) profile of the interface, two stable structures and a high-energy structure are located. During the relaxation, the regions that possess the stable structures expand and develop into coherent regions; the regions with high-energy structure shrink into the intersection of misfit dislocations (nodes). This process reduces the interface excess potential energy but increases the core energy of the misfit dislocations and nodes. The core width is dependent on the GSFE of the interface. The high-energy structure relaxes by relative rotation and dilatation between the crystals. The relative rotation is responsible for the spiral pattern at nodes. The relative dilatation is responsible for the creation of free volume at nodes, which facilitates the nodes’ structural transformation. Several node structures have been observed and analyzed. In conclusion, the various structures have significant impact on the plastic deformation in terms of lattice dislocation nucleation, as well as the point defect formation energies.},
doi = {10.3390/met5041887},
journal = {Metals},
number = 4,
volume = 5,
place = {United States},
year = {Thu Oct 15 00:00:00 EDT 2015},
month = {Thu Oct 15 00:00:00 EDT 2015}
}
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