Embracing the Chaos: Alloying Adds Stochasticity to Twin Embryo Growth

Yang Hu, Vladyslav Turlo, Irene J. Beyerlein, Subhash Mahajan, Enrique J. Lavernia, Julie M. Schoenung, and Timothy J. Rupert

Phys. Rev. Lett. 125, 205503 – Published 13 November 2020

Abstract

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.

Received 26 June 2020
Revised 3 September 2020
Accepted 8 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.205503

Physics Subject Headings (PhySH)

Mechanical deformation Twinning

Alloys Hexagonal close-packed

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yang Hu ¹, Vladyslav Turlo ², Irene J. Beyerlein ^3,4, Subhash Mahajan⁵, Enrique J. Lavernia¹, Julie M. Schoenung¹, and Timothy J. Rupert ^1,2,*

¹Department of Materials Science and Engineering, University of California, Irvine, California 92697, USA
²Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697, USA
³Mechanical Engineering Department, University of California, Santa Barbara, California 93106, USA
⁴Materials Department, University of California, Santa Barbara, California 93106, USA
⁵Department of Materials Science and Engineering, University of California, Davis, California 95616, USA

^*Corresponding author. trupert@uci.edu

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Vol. 125, Iss. 20 — 13 November 2020

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