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Title: Revisiting the Al/Al2O3 Interface: Coherent Interfaces and Misfit Accommodation

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep04485· OSTI ID:1321737
 [1];  [2];  [1];  [2];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  2. Delft Univ. of Technology (Netherlands). Department of Materials Science and Engineering

We report the coherent and semi-coherent Al/α-Al2O3 interfaces using molecular dynamics simulations with a mixed, metallic-ionic atomistic model. For the coherent interfaces, both Al-terminated and O-terminated nonstoichiometric interfaces have been studied and their relative stability has been established. To understand the misfit accommodation at the semi-coherent interface, a 1-dimensional (1D) misfit dislocation model and a 2-dimensional (2D) dislocation network model have been studied. For the latter case, our analysis reveals an interface dislocation structure with a network of three sets of parallel dislocations, each with pure-edge character, giving rise to a pattern of coherent and stacking-fault-like regions at the interface. Structural relaxation at elevated temperatures leads to a further change of the dislocation pattern, which can be understood in terms of a competition between the stacking fault energy and the dislocation interaction energy at the interface. In conclusion, our results are expected to serve as an input for the subsequent dislocation dynamics models to understand and predict the macroscopic mechanical behavior of Al/α-Al2O3 composite heterostructures.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1321737
Report Number(s):
LA-UR-14-20831
Journal Information:
Scientific Reports, Vol. 4; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Adsorption of Hydrogen Sulfide, Hydrosulfide and Sulfide at Cu(110) - Polarizability and Cooperativity Effects. First Stages of Formation of a Sulfide Layer. journal June 2018
Strength of ceramic–metal joints measured in planar impact experiments journal February 2018
Effect of SiC nanoparticles on the precipitation behavior and mechanical properties of 7075Al alloy journal February 2020
Structural modifications due to interface chemistry at metal-nitride interfaces journal November 2015
High-temperature thermoelectric transport behavior of the Al/γ-Al 2 O 3 interface: impact of electron and phonon scattering at nanoscale metal–ceramic contacts journal January 2018
Dislocations penetrating an Al/Si interface journal December 2017
Semicoherent oxide heterointerfaces: Structure, properties, and implications journal October 2019
Review—Beyond the Highs and Lows: A Perspective on the Future of Dielectrics Research for Nanoelectronic Devices journal January 2019
Thermal Boundary Characteristics of Homo-/Heterogeneous Interfaces journal April 2019
Hydrogen bonds in Al2O3 as dissipative two-level systems in superconducting qubits journal December 2014

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