Microstructural pattern formation during liquid metal dealloying: Phase-field simulations and theoretical analyses

Lai, Longhai; Geslin, Pierre-Antoine; Karma, Alain

doi:10.1103/physrevmaterials.6.093803

Cited by 3 publications

(3 citation statements)

References 58 publications

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“…The relative effects of GBMD are expected to be sensitive to solute transport within grains. Indeed, the LMD phase field model by Lai et al 19 predicts that, in the absence of grain boundary effects, increasing solidstate diffusivity in the precursor leads to a more lamellar, aligned structure. The present model could be used in a future study to explore the relative effect of these driving forces and kinetics through a parameter sensitivity analysis, which could be used to motivate future experiments and lower-length scale simulation studies.…”

Section: Discussionmentioning

confidence: 99%

“…Their model successfully predicted the early stages of dealloying and A-ligament formation and elaborated on this mechanism of interface-diffusion-coupled growth of the A (Ta)rich solid and C (Cu)-rich liquid into the AB (TaTi) precursor. This work was extended by Lai et al 18,19 who showed that ligament morphology can be manipulated by adding certain elements to the dealloying agent which control the solubility of the nondissolving species. Lai et al 19 also exercised this phase field model to predict how diffusivity in the precursor influences dealloying morphology.…”

Section: Introductionmentioning

confidence: 92%

“…This work was extended by Lai et al 18,19 who showed that ligament morphology can be manipulated by adding certain elements to the dealloying agent which control the solubility of the nondissolving species. Lai et al 19 also exercised this phase field model to predict how diffusivity in the precursor influences dealloying morphology. A phase field model for electrochemical dealloying of AuAg and AuAl was recently developed by Li et al 20 , which incorporates interfacial diffusive processes for porosity development, and also defines a dissolution rate that accounts for Butler-Volmer reaction kinetics.…”

Section: Introductionmentioning

confidence: 92%

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Grain boundary effects in high-temperature liquid-metal dealloying: a multi-phase field study

2023

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A multi-phase field model is employed to study the microstructural evolution of an alloy undergoing liquid dealloying, specifically considering the role of grain boundaries. A semi-implicit time-stepping algorithm using spectral methods is implemented, which enables simulating large 2D and 3D domains over long time scales while still maintaining a realistic interfacial thickness. Simulations reveal a mechanism of coupled grain–boundary migration to maintain equilibrium contact angles with the topologically complex solid–liquid interface, which locally accelerates diffusion-coupled growth of a liquid channel into the precursor. This mechanism asymmetrically disrupts the ligament connectivity of the dealloyed structure in qualitative agreement with published experimental observations. The grain boundary migration-assisted corrosion channels form even for precursors with small amounts of the dissolving alloy species, below the parting limit. The activation of this grain boundary dealloying mechanism depends strongly on grain boundary mobility.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 92%

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Grain boundary effects in high-temperature liquid-metal dealloying: a multi-phase field study

2023

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Partial liquid metal dealloying to synthesize nickel-containing porous and composite ferrous and high-entropy alloys

et al. 2023

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Liquid metal dealloying is a promising technique to produce bicontinuous porous metals with high specific surface areas. This processing technique relies on the selective dissolution of a component from a precursor alloy into a metal bath while the remaining insoluble component self-assembles into an interconnected structure. However, it has not been applied to produce nickel-containing porous metals because of the lack of a suitable metallic bath. Here we show that nickel-containing porous metals can be produced by partial liquid metal dealloying. The amount of soluble component in the resulting microstructure can be tuned by carefully choosing the bath element so that the ligaments of desired composition equilibrate with the metal bath. We demonstrate this partial liquid dealloying concept using magnesium and bismuth baths and rationalize the results through thermodynamics calculations. Furthermore, we apply this technique to produce porous nickel-containing stainless steel and high-entropy alloy.

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Morphology selection in dealloying: A phase field study of the coupling among kinetic mechanisms

Kerr,

Bieberdorf,

Capolungo

et al. 2024

Phys. Rev. Materials

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Microstructural pattern formation during liquid metal dealloying: Phase-field simulations and theoretical analyses

Cited by 3 publications

References 58 publications

Grain boundary effects in high-temperature liquid-metal dealloying: a multi-phase field study

Grain boundary effects in high-temperature liquid-metal dealloying: a multi-phase field study

Partial liquid metal dealloying to synthesize nickel-containing porous and composite ferrous and high-entropy alloys

Morphology selection in dealloying: A phase field study of the coupling among kinetic mechanisms

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