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Title: 3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals

Abstract

A dislocation dynamics (DD) model for plastic deformation, connecting the macroscopic mechanical properties to basic physical laws governing dislocation mobility and related interaction mechanisms, has been under development. In this model there is a set of critical reactions that determine the overall results of the simulations, such as the stress-strain curve. These reactions are, annihilation, formation of jogs, junctions, and dipoles, and cross-slip. In this paper we discuss these reactions and the manner in which they influence the simulated stress- strain behavior in fcc and bcc metals. In particular, we examine the formation (zipping) and strength of dipoles and junctions, and effect of jogs, using the dislocation dynamics model. We show that the strengths (unzipping) of these reactions for various configurations can be determined by direct evaluation of the elastic interactions. Next, we investigate the phenomenon of hardening in metals subjected to cascade damage dislocations. The microstructure investigated consists of small dislocation loops decorating the mobile dislocations. Preliminary results reveal that these loops act as hardening agents, trapping the dislocations and resulting in increased hardening.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
12206
Report Number(s):
UCRL-ID-134061; YN0100000; 98-ERD-090
YN0100000; 98-ERD-090; TRN: AH200119%%296
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 19 Feb 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; METALS; FCC LATTICES; BCC LATTICES; DEFORMATION; DISLOCATIONS; HARDENING; MICROSTRUCTURE; PLASTICITY; STRAINS; STRESSES; MATHEMATICAL MODELS

Citation Formats

Hirth, J P, Rhee, M, Zhib, H M, and de la Rubia, T D. 3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals. United States: N. p., 1999. Web. doi:10.2172/12206.
Hirth, J P, Rhee, M, Zhib, H M, & de la Rubia, T D. 3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals. United States. doi:10.2172/12206.
Hirth, J P, Rhee, M, Zhib, H M, and de la Rubia, T D. Fri . "3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals". United States. doi:10.2172/12206. https://www.osti.gov/servlets/purl/12206.
@article{osti_12206,
title = {3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals},
author = {Hirth, J P and Rhee, M and Zhib, H M and de la Rubia, T D},
abstractNote = {A dislocation dynamics (DD) model for plastic deformation, connecting the macroscopic mechanical properties to basic physical laws governing dislocation mobility and related interaction mechanisms, has been under development. In this model there is a set of critical reactions that determine the overall results of the simulations, such as the stress-strain curve. These reactions are, annihilation, formation of jogs, junctions, and dipoles, and cross-slip. In this paper we discuss these reactions and the manner in which they influence the simulated stress- strain behavior in fcc and bcc metals. In particular, we examine the formation (zipping) and strength of dipoles and junctions, and effect of jogs, using the dislocation dynamics model. We show that the strengths (unzipping) of these reactions for various configurations can be determined by direct evaluation of the elastic interactions. Next, we investigate the phenomenon of hardening in metals subjected to cascade damage dislocations. The microstructure investigated consists of small dislocation loops decorating the mobile dislocations. Preliminary results reveal that these loops act as hardening agents, trapping the dislocations and resulting in increased hardening.},
doi = {10.2172/12206},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {2}
}

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