On the co-nucleation of adjoining twin pairs at grain boundaries in hexagonal close-packed materials

Bamney, Darshan; Capolungo, Laurent

doi:10.1016/j.scriptamat.2023.115882

On the co-nucleation of adjoining twin pairs at grain boundaries in hexagonal close-packed materials

Journal Article · Fri Nov 24 00:00:00 EST 2023 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2023.115882· OSTI ID:2566442

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Here this work addresses the formation of adjoining twin pairs (ATPs) at grain boundaries (GBs) in hexagonal close-packed (hcp) metals from the perspective of the co-nucleation (CN) of pairs of deformation twins. A continuum defect mechanics model is proposed to investigate the energetic feasibility of the CN of ATPs resulting from the dissociation of GB dislocations. Application of the model to a set of GBs in Mg reveals that CN is largely preferred over the nucleation of a single twin variant for low misorientation angle GBs, which is consistent with previous experimental analyses. The CN events are subsequently analyzed considering the GB character, and the twin system alignment ($$m$$') and Schmid factors to obtain better insights into the conditions governing the formation of ATPs via CN. The likelihood of CN even at low $$m$$' values reveals that CN events could be responsible for the formation of ATP pairs in these scenarios.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2566442

Alternate ID(s):: OSTI ID: 2222984

Report Number(s):: LA-UR--23-27782

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 241; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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