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Title: Kinetics and morphological evolution of liquid metal dealloying

Authors:
; ; ; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1323582
Grant/Contract Number:
FG02-07ER46400
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 115; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-06 15:55:13; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

McCue, Ian, Gaskey, Bernard, Geslin, Pierre-Antoine, Karma, Alain, and Erlebacher, Jonah. Kinetics and morphological evolution of liquid metal dealloying. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.05.032.
McCue, Ian, Gaskey, Bernard, Geslin, Pierre-Antoine, Karma, Alain, & Erlebacher, Jonah. Kinetics and morphological evolution of liquid metal dealloying. United States. doi:10.1016/j.actamat.2016.05.032.
McCue, Ian, Gaskey, Bernard, Geslin, Pierre-Antoine, Karma, Alain, and Erlebacher, Jonah. 2016. "Kinetics and morphological evolution of liquid metal dealloying". United States. doi:10.1016/j.actamat.2016.05.032.
@article{osti_1323582,
title = {Kinetics and morphological evolution of liquid metal dealloying},
author = {McCue, Ian and Gaskey, Bernard and Geslin, Pierre-Antoine and Karma, Alain and Erlebacher, Jonah},
abstractNote = {},
doi = {10.1016/j.actamat.2016.05.032},
journal = {Acta Materialia},
number = C,
volume = 115,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.actamat.2016.05.032

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • Nanoporous materials, especially those fabricated by liquid metal dealloying processes, possess great potential in a wide range of applications due to their high surface area, bicontinuous structure with both open pores for transport and solid phase for conductivity or support, and low material cost. Here, we used X-ray nanotomography and X-ray fluorescence microscopy to reveal the three-dimensional (3D) morphology and elemental distribution within materials. Focusing on nanoporous stainless steel, we evaluated the 3D morphology of the dealloying front and established a quantitative processing-structure-property relationship at a later stage of dealloying. The morphological differences of samples created by liquid metal dealloyingmore » and aqueous dealloying methods were also discussed. Here, we concluded that it is particularly important to consider the dealloying, coarsening, and densification mechanisms in influencing the performance-determining, critical 3D parameters, such as tortuosity, pore size, porosity, curvature, and interfacial shape.« less
  • Liquid metal dealloying has emerged as a novel technique to produce topologically complex nanoporous and nanocomposite structures with ultra-high interfacial area and other unique properties relevant for diverse material applications. This process is empirically known to require the selective dissolution of one element of a multicomponent solid alloy into a liquid metal to obtain desirable structures. However, how structures form is not known. Here we demonstrate, using mesoscale phase-field modelling and experiments, that nano/microstructural pattern formation during dealloying results from the interplay of (i) interfacial spinodal decomposition, forming compositional domain structures enriched in the immiscible element, and (ii) diffusion-coupled growthmore » of the enriched solid phase and the liquid phase into the alloy. We highlight how those two basic mechanisms interact to yield a rich variety of topologically disconnected and connected structures. Furthermore, we deduce scaling laws governing microstructural length scales and dealloying kinetics.« less
  • The morphological evolution and coarsening kinetics of L1{sub 2} ordered (Al{sub 3}Li) precipitates ({delta}{prime}) in a f.c.c. disordered matrix ({alpha}) were investigated using computer simulations based on microscopic diffusion equations. The effective interatomic interactions were fitted to the phase diagram using a two-neighbor mean-field model whereas the kinetic parameter in the microscopic diffusion equation was fitted to the chemical diffusion coefficient in the equilibrium disordered phase. The coalescence or encounter among precipitates which belong to any one of the four different antiphase domains of the L1{sub 2} ordered phase is automatically taken into account. Volume fractions ranging from 20 tomore » 65% were studied. Structure, scaling and particle-size distribution (PSD) functions were calculated. It is shown that the PSDs become increasingly broad and their skewness changes sign from negative to positive with increasing precipitate volume fraction. It is found that the cube of the average particle radius varies approximately linearly with time in the scaling regime for all the volume fractions studied, with the rate constant increasing with volume fraction. During coarsening, the volume fraction is not constant, approaching the equilibrium value asymptotically with time. The results are compared with existing analytical theories and experimental measurements.« less
  • No abstract prepared.
  • Historically, dealloying, the selective dissolution of elemental components from an alloy, has been studied most intensively for binary noble-metal alloys such as Ag-Au, Cu-Au and Zn-Cu. There have been three primacy "mechanisms" proposed to explain ambient temperature dealloying in such systems: "simultaneous" dissolution of both components/redeposition of the more-noble constituent, lattice diffusion-supported by a di-vacancy mechanism of the more reactive component to the alloy/electrolyte interface and percolation dissolution. Here, we briefly discuss each of these mechanisms and the corresponding dealloyed morphology. In order to examine the connection between a mechanism and morphology we examined dealloying of Mg from Mg-Cd alloysmore » under conditions for which vacancy-mediated lattice diffusion occurs at significant rates. Depending on alloy composition and dealloying rate, we observed either "negative" dendrites or bi-continuous structures, each of which is directly associated with the operation of a particular mechanism. Our findings should be useful to researchers employing dealloying to obtain particular types nanostructured features for a variety of applications. (C) 2013 The Electrochemical Society. All rights reserved.« less