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Title: A bond-order potential for the Al–Cu–H ternary system

Abstract

Al-Based Al–Cu alloys have a very high strength to density ratio, and are therefore important materials for transportation systems including vehicles and aircrafts. These alloys also appear to have a high resistance to hydrogen embrittlement, and as a result, are being explored for hydrogen related applications. To enable fundamental studies of mechanical behavior of Al–Cu alloys under hydrogen environments, we have developed an Al–Cu–H bond-order potential according to the formalism implemented in the molecular dynamics code LAMMPS. Our potential not only fits well to properties of a variety of elemental and compound configurations (with coordination varying from 1 to 12) including small clusters, bulk lattices, defects, and surfaces, but also passes stringent molecular dynamics simulation tests that sample chaotic configurations. Careful studies verified that this Al–Cu–H potential predicts structural property trends close to experimental results and quantum-mechanical calculations; in addition, it properly captures Al–Cu, Al–H, and Cu–H phase diagrams and enables simulations of H2 dissociation, chemisorption, and absorption on Al–Cu surfaces.

Authors:
ORCiD logo [1];  [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1429693
Report Number(s):
SAND-2017-12659J
Journal ID: ISSN 1144-0546; NJCHE5; 658934; TRN: US1802480
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
New Journal of Chemistry
Additional Journal Information:
Journal Volume: 42; Journal Issue: 7; Journal ID: ISSN 1144-0546
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Zhou, X. W., Ward, D. K., and Foster, M. E. A bond-order potential for the Al–Cu–H ternary system. United States: N. p., 2018. Web. doi:10.1039/c8nj00513c.
Zhou, X. W., Ward, D. K., & Foster, M. E. A bond-order potential for the Al–Cu–H ternary system. United States. doi:10.1039/c8nj00513c.
Zhou, X. W., Ward, D. K., and Foster, M. E. Tue . "A bond-order potential for the Al–Cu–H ternary system". United States. doi:10.1039/c8nj00513c. https://www.osti.gov/servlets/purl/1429693.
@article{osti_1429693,
title = {A bond-order potential for the Al–Cu–H ternary system},
author = {Zhou, X. W. and Ward, D. K. and Foster, M. E.},
abstractNote = {Al-Based Al–Cu alloys have a very high strength to density ratio, and are therefore important materials for transportation systems including vehicles and aircrafts. These alloys also appear to have a high resistance to hydrogen embrittlement, and as a result, are being explored for hydrogen related applications. To enable fundamental studies of mechanical behavior of Al–Cu alloys under hydrogen environments, we have developed an Al–Cu–H bond-order potential according to the formalism implemented in the molecular dynamics code LAMMPS. Our potential not only fits well to properties of a variety of elemental and compound configurations (with coordination varying from 1 to 12) including small clusters, bulk lattices, defects, and surfaces, but also passes stringent molecular dynamics simulation tests that sample chaotic configurations. Careful studies verified that this Al–Cu–H potential predicts structural property trends close to experimental results and quantum-mechanical calculations; in addition, it properly captures Al–Cu, Al–H, and Cu–H phase diagrams and enables simulations of H2 dissociation, chemisorption, and absorption on Al–Cu surfaces.},
doi = {10.1039/c8nj00513c},
journal = {New Journal of Chemistry},
number = 7,
volume = 42,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Table B-II Table B-II: One-body BOP parameters for Al-Cu-H system.

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