A phenomenological dislocation mobility law for bcc metals
Abstract
Dislocation motion in body centered cubic (bcc) metals displays a number of specific features that result in a strong temperature dependence of the flow stress, and in shear deformation asymmetries relative to the loading direction as well as crystal orientation. Here we develop a generalized dislocation mobility law in bcc metals, and demonstrate its use in discrete Dislocation Dynamics (DD) simulations of plastic flow in tungsten (W) micro pillars. We present the theoretical background for dislocation mobility as a motivating basis for the developed law. Analytical theory, molecular dynamics (MD) simulations, and experimental data are used to construct a general phenomenological description. The usefulness of the mobility law is demonstrated through its application to modeling the plastic deformation of W micro pillars. The model is consistent with experimental observations of temperature and orientation dependence of the flow stress and the corresponding dislocation microstructure.
- Authors:
-
- Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept.
- Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.; Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
- Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
- Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
- Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept. Materials Science and Engineering Dept.
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1533448
- Alternate Identifier(s):
- OSTI ID: 1358717
- Grant/Contract Number:
- FG02-03ER54708
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 119; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; dislocation mobility; bcc metals; non-Schmid effects; tungsten
Citation Formats
Po, Giacomo, Cui, Yinan, Rivera, David, Cereceda, David, Swinburne, Tom D., Marian, Jaime, and Ghoniem, Nasr. A phenomenological dislocation mobility law for bcc metals. United States: N. p., 2016.
Web. doi:10.1016/j.actamat.2016.08.016.
Po, Giacomo, Cui, Yinan, Rivera, David, Cereceda, David, Swinburne, Tom D., Marian, Jaime, & Ghoniem, Nasr. A phenomenological dislocation mobility law for bcc metals. United States. https://doi.org/10.1016/j.actamat.2016.08.016
Po, Giacomo, Cui, Yinan, Rivera, David, Cereceda, David, Swinburne, Tom D., Marian, Jaime, and Ghoniem, Nasr. Mon .
"A phenomenological dislocation mobility law for bcc metals". United States. https://doi.org/10.1016/j.actamat.2016.08.016. https://www.osti.gov/servlets/purl/1533448.
@article{osti_1533448,
title = {A phenomenological dislocation mobility law for bcc metals},
author = {Po, Giacomo and Cui, Yinan and Rivera, David and Cereceda, David and Swinburne, Tom D. and Marian, Jaime and Ghoniem, Nasr},
abstractNote = {Dislocation motion in body centered cubic (bcc) metals displays a number of specific features that result in a strong temperature dependence of the flow stress, and in shear deformation asymmetries relative to the loading direction as well as crystal orientation. Here we develop a generalized dislocation mobility law in bcc metals, and demonstrate its use in discrete Dislocation Dynamics (DD) simulations of plastic flow in tungsten (W) micro pillars. We present the theoretical background for dislocation mobility as a motivating basis for the developed law. Analytical theory, molecular dynamics (MD) simulations, and experimental data are used to construct a general phenomenological description. The usefulness of the mobility law is demonstrated through its application to modeling the plastic deformation of W micro pillars. The model is consistent with experimental observations of temperature and orientation dependence of the flow stress and the corresponding dislocation microstructure.},
doi = {10.1016/j.actamat.2016.08.016},
journal = {Acta Materialia},
number = ,
volume = 119,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}
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