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

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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, ... continued below

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1.7 Megabytes pages

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Hirth, J P; Rhee, M; Zhib, H M & de la Rubia, T D February 19, 1999.

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Description

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.

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1.7 Megabytes pages

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  • Other Information: PBD: 19 Feb 1999

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  • Report No.: UCRL-ID-134061
  • Report No.: YN0100000
  • Report No.: 98-ERD-090
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/12206 | External Link
  • Office of Scientific & Technical Information Report Number: 12206
  • Archival Resource Key: ark:/67531/metadc622102

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  • February 19, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 5, 2016, 8:59 p.m.

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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, report, February 19, 1999; California. (digital.library.unt.edu/ark:/67531/metadc622102/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.