A coupled vacancy diffusion-dislocation dynamics model for the climb-glide motion of jogged screw dislocations

Li, Yang; Ghoniem, Nasr; Baker, Kristopher; Ramirez Flores, Benjamin; Black, Thomas; Hollenbeck, James; Po, Giacomo

doi:10.1016/j.actamat.2022.118546

A coupled vacancy diffusion-dislocation dynamics model for the climb-glide motion of jogged screw dislocations

Journal Article · Fri Nov 25 00:00:00 EST 2022 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2022.118546· OSTI ID:2420815

^[1]; Ghoniem, Nasr ^[2]; ^[3]; Ramirez Flores, Benjamin ^[3]; Black, Thomas ^[4]; ^[4]; ^[5]

Univ. of California, Los Angeles, CA (United States); OSTI
Univ. of California, Los Angeles, CA (United States)
Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY (United States)
Bettis Atomic Power Laboratory (BAPL), West Mifflin, PA (United States)
Univ. of Miami, FL (United States)

Here, we develop a novel model to study the climb/glide motion of jogged screw dislocations within the discrete dislocation dynamics (DDD) framework. We present results for the dependence of the climb velocity on the applied stress and on the jog size and distribution statistics. We show that the model predictions are consistent with experimental data in both γ-TiAl and Zircaloy-4. The ranges of the applied stress and jog spacing that determine the dominance of one of three dislocation mechanisms are identified. These are the jog dragging, dipole dragging, and dipole bypass mechanisms, respectively. The overall dislocation motion in the jog dragging regime is composed of glide of screw segments and climb of jogs, controlling the plastic strain and the creep rate, respectively. Based on current simulations and on a detailed examination of the predicted jog heights compared to experiments, we advance the hypothesis that a combination of jog dragging and dipole bypass mechanisms is necessary to reproduce the high creep rate observed in some experiments.

View Accepted Manuscript (DOE)

Research Organization:: Naval Nuclear Laboratory (NNL), Howe, ID (United States); Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0018410

OSTI ID:: 2420815

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 244; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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