Embracing the Chaos: Alloying Adds Stochasticity to Twin Embryo Growth

High-throughput atomistic simulations reveal the unique effect of solute atoms on twin variant selection in Mg-Al alloys. Twin embryo growth first undergoes a stochastic incubation stage when embryos choose which twin variant to adopt, and then a deterministic growth stage when embryos expand withou...

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Bibliographic Details
Published inPhysical review letters Vol. 125; no. 20; p. 205503
Main Authors Hu, Yang, Turlo, Vladyslav, Beyerlein, Irene J, Mahajan, Subhash, Lavernia, Enrique J, Schoenung, Julie M, Rupert, Timothy J
Format Journal Article
LanguageEnglish
Published United States 13.11.2020
Subjects
Alloys - chemistry
Aluminum - chemistry
Magnesium - chemistry
Models, Chemical
Molecular Dynamics Simulation
Stochastic Processes
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Summary:High-throughput atomistic simulations reveal the unique effect of solute atoms on twin variant selection in Mg-Al alloys. Twin embryo growth first undergoes a stochastic incubation stage when embryos choose which twin variant to adopt, and then a deterministic growth stage when embryos expand without changing the selected twin variant. An increase in Al composition promotes the stochastic incubation behavior on the atomic level due to nucleation and pinning of interfacial disconnections. At compositions above a critical value, disconnection pinning results in multiple twin variant selection.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.125.205503