An analysis of key characteristics of the Frank-Read source process in FCC metals
Abstract
A well-known intragranular dislocation source, the Frank-Read (FR) source plays an important role in size-dependent dislocation multiplication in crystalline materials. Despite a number of studies in this topic, a systematic investigation of multiple aspects of the FR source in different materials is lacking. Here, in this paper, we employ large scale quasistatic concurrent atomistic-continuum (CAC) simulations to model an edge dislocation bowing out from an FR source in Cu, Ni, and Al. First, a number of quantities that are important for the FR source process are quantified in the coarse-grained domain. Then, two key characteristics of the FR source, including the critical shear stress and critical dislocation configuration, are investigated. In all crystalline materials, the critical stresses and the aspect ratio of the dislocation half-loop height to the FR source length scale well with respect to the FR source length. In Al, the critical stress calculated by CAC simulations for a given FR source length agrees reasonably well with a continuum model that explicitly includes the dislocation core energy. Nevertheless, the predictions of the isotropic elastic theory do not accurately capture the FR source responses in Cu and Ni, which have a relatively large stacking fault width and elastic anisotropy.more »
- Authors:
-
- Georgia Institute of Technology, Atlanta, GA (United States)
- Iowa State Univ., Ames, IA (United States)
- Univ. of Florida, Gainesville, FL (United States)
- Publication Date:
- Research Org.:
- Univ. of Florida, Gainesville, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1533999
- Alternate Identifier(s):
- OSTI ID: 1430575
- Grant/Contract Number:
- SC0006539; CMMI-1232878; CMMI-1233113; CMMI-1536925; ACI-1053575
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Mechanics and Physics of Solids
- Additional Journal Information:
- Journal Volume: 96; Journal ID: ISSN 0022-5096
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Concurrent atomistic-continuum; Dislocation multiplication; Frank-Read source; FCC metals
Citation Formats
Xu, Shuozhi, Xiong, Liming, Chen, Youping, and McDowell, David L. An analysis of key characteristics of the Frank-Read source process in FCC metals. United States: N. p., 2016.
Web. doi:10.1016/j.jmps.2016.08.002.
Xu, Shuozhi, Xiong, Liming, Chen, Youping, & McDowell, David L. An analysis of key characteristics of the Frank-Read source process in FCC metals. United States. https://doi.org/10.1016/j.jmps.2016.08.002
Xu, Shuozhi, Xiong, Liming, Chen, Youping, and McDowell, David L. Sat .
"An analysis of key characteristics of the Frank-Read source process in FCC metals". United States. https://doi.org/10.1016/j.jmps.2016.08.002. https://www.osti.gov/servlets/purl/1533999.
@article{osti_1533999,
title = {An analysis of key characteristics of the Frank-Read source process in FCC metals},
author = {Xu, Shuozhi and Xiong, Liming and Chen, Youping and McDowell, David L.},
abstractNote = {A well-known intragranular dislocation source, the Frank-Read (FR) source plays an important role in size-dependent dislocation multiplication in crystalline materials. Despite a number of studies in this topic, a systematic investigation of multiple aspects of the FR source in different materials is lacking. Here, in this paper, we employ large scale quasistatic concurrent atomistic-continuum (CAC) simulations to model an edge dislocation bowing out from an FR source in Cu, Ni, and Al. First, a number of quantities that are important for the FR source process are quantified in the coarse-grained domain. Then, two key characteristics of the FR source, including the critical shear stress and critical dislocation configuration, are investigated. In all crystalline materials, the critical stresses and the aspect ratio of the dislocation half-loop height to the FR source length scale well with respect to the FR source length. In Al, the critical stress calculated by CAC simulations for a given FR source length agrees reasonably well with a continuum model that explicitly includes the dislocation core energy. Nevertheless, the predictions of the isotropic elastic theory do not accurately capture the FR source responses in Cu and Ni, which have a relatively large stacking fault width and elastic anisotropy. Our results highlight the significance of directly simulating the FR source activities using fully 3D models and shed light on developing more accurate continuum models.},
doi = {10.1016/j.jmps.2016.08.002},
journal = {Journal of the Mechanics and Physics of Solids},
number = ,
volume = 96,
place = {United States},
year = {Sat Aug 06 00:00:00 EDT 2016},
month = {Sat Aug 06 00:00:00 EDT 2016}
}
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