An analysis of key characteristics of the Frank-Read source process in FCC metals

Xu, Shuozhi; Xiong, Liming; Chen, Youping; McDowell, David L.

doi:10.1016/j.jmps.2016.08.002

An analysis of key characteristics of the Frank-Read source process in FCC metals

Journal Article · Sat Aug 06 00:00:00 EDT 2016 · Journal of the Mechanics and Physics of Solids

DOI:https://doi.org/10.1016/j.jmps.2016.08.002· OSTI ID:1533999

Xu, Shuozhi ^[1]; Xiong, Liming ^[2]; Chen, Youping ^[3]; McDowell, David L. ^[4]

Georgia Institute of Technology, Atlanta, GA (United States); DOE/OSTI
Iowa State Univ., Ames, IA (United States)
Univ. of Florida, Gainesville, FL (United States)
Georgia Institute of Technology, Atlanta, GA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0006539

OSTI ID:: 1533999

Alternate ID(s):: OSTI ID: 1430575

Journal Information:: Journal of the Mechanics and Physics of Solids, Journal Name: Journal of the Mechanics and Physics of Solids Vol. 96; ISSN 0022-5096

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Concurrent atomistic-continuum
Dislocation multiplication
FCC metals
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An analysis of key characteristics of the Frank-Read source process in FCC metals

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