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Title: Interface-mediated plasticity of nanoscale Al–Al2Cu eutectics

Abstract

Laser surface re-melted Al-Al2Cu eutectic alloy with α-Al and θ-Al2Cu nanoscale lamellae exhibits high strength and good plasticity at room temperature, implying that the nanoscale θ-Al2Cu lamellae plastically co-deform with α-Al. Microscopy characterization reveal that plastic deformation of θ-Al2Cu lamellae is accommodated by localized shear on unusual slip planes of {121}Al2Cu. Herein, we elucidate interface-mediated deformation mechanisms of nanoscale Al -Al2Cu eutectics and investigate the structure and properties of the {001}Al$$\parallel$${001}Al2Cu interface using atomistic simulations. Simulation results reveal that the interface is composed of two sets of misfit dislocations with the displacement shift complete vectors as Burgers vectors.

Authors:
 [1]; ORCiD logo [2];  [2]; ORCiD logo [1]
  1. University of Nebraska, Lincoln, NE (United States)
  2. University of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1596367
Alternate Identifier(s):
OSTI ID: 1595155
Grant/Contract Number:  
SC0016808
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 186; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; interface; dislocation; plasticity; Al–Al2Cu eutectic; atomistic simulations

Citation Formats

Liu, Guisen, Wang, Shujuan, Misra, Amit, and Wang, Jian. Interface-mediated plasticity of nanoscale Al–Al2Cu eutectics. United States: N. p., 2020. Web. doi:10.1016/j.actamat.2020.01.024.
Liu, Guisen, Wang, Shujuan, Misra, Amit, & Wang, Jian. Interface-mediated plasticity of nanoscale Al–Al2Cu eutectics. United States. https://doi.org/10.1016/j.actamat.2020.01.024
Liu, Guisen, Wang, Shujuan, Misra, Amit, and Wang, Jian. Thu . "Interface-mediated plasticity of nanoscale Al–Al2Cu eutectics". United States. https://doi.org/10.1016/j.actamat.2020.01.024. https://www.osti.gov/servlets/purl/1596367.
@article{osti_1596367,
title = {Interface-mediated plasticity of nanoscale Al–Al2Cu eutectics},
author = {Liu, Guisen and Wang, Shujuan and Misra, Amit and Wang, Jian},
abstractNote = {Laser surface re-melted Al-Al2Cu eutectic alloy with α-Al and θ-Al2Cu nanoscale lamellae exhibits high strength and good plasticity at room temperature, implying that the nanoscale θ-Al2Cu lamellae plastically co-deform with α-Al. Microscopy characterization reveal that plastic deformation of θ-Al2Cu lamellae is accommodated by localized shear on unusual slip planes of {121}Al2Cu. Herein, we elucidate interface-mediated deformation mechanisms of nanoscale Al -Al2Cu eutectics and investigate the structure and properties of the {001}Al$\parallel${001}Al2Cu interface using atomistic simulations. Simulation results reveal that the interface is composed of two sets of misfit dislocations with the displacement shift complete vectors as Burgers vectors.},
doi = {10.1016/j.actamat.2020.01.024},
journal = {Acta Materialia},
number = C,
volume = 186,
place = {United States},
year = {Thu Jan 16 00:00:00 EST 2020},
month = {Thu Jan 16 00:00:00 EST 2020}
}

Journal Article:

Citation Metrics:
Cited by: 18 works
Citation information provided by
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Figures / Tables:

Fig. 1 Fig. 1: (a) Microstructures of the Al-Al2Cu eutectic, the dark phase is α-Al and the light phase is θ-Al2Cu. (b) Localized shears in rolled nanoscale Al2Cu lamellae of the laser surface re-melting treated material. (c) Diffraction patterns of the Al2Cu lamella from “B” area in (b), showing the shear planemore » is (011)Al2Cu. (d) The interface plane associated with variant I OR and (e) the corresponding diffraction patterns of the two phases, indicating the interface plane is (001)Al2Cu||(001)Al. (f) HRTEM image showing a terraced (001)Al2Cu||(001)Al interface« less

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