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Title: 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:
 [1];  [1];  [1];  [2];  [3];  [4];  [5]
  1. Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept.
  2. Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.; Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
  3. Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
  4. Univ. of California, Los Angeles, CA (United States). Materials Science and Engineering Dept.
  5. 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:
Journal Article: 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. 2016. "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},
url = {https://www.osti.gov/biblio/1533448}, journal = {Acta Materialia},
issn = {1359-6454},
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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Citation Metrics:
Cited by: 118 works
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Works referencing / citing this record:

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Non-glide effects and dislocation core fields in BCC metals
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Influence of Size on the Fractal Dimension of Dislocation Microstructure
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Atomistic Study of the Role of Defects on α → ϵ Phase Transformations in Iron under Hydrostatic Compression
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Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires
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