Dislocation Dynamics

Zbib, Hussein M.; Khraishi, Tariq

doi:10.1007/978-1-4020-3286-8_55

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…The knowledge of slip systems is the essential fundamentals for understanding mechanical behaviors and developing materials modeling tools at high length scales, such as discrete dislocation dynamics and crystal plasticity models [Ghoniem et al, 2000;Zbib and Khraishi, 2005;Diard et al, 2005]. The creation of vacancies associated with the relatively easy dislocation climb could account for structural instability of -Al 2 Cu and poor deformability.…”

Section: Discussionmentioning

confidence: 99%

Atomistic study of fundamental character and motion of dislocations in intermetallic Al2Cu

Zhou

Wang

Misra

et al. 2016

International Journal of Plasticity

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Atomic scale study of the character and motion of dislocations in Al 2 Cu will provide insights into understanding the superior mechanical properties of Al-Al 2 Cu alloys. Using atomistic simulations, we studied seven potential slip systems (110)<001>, (010)<001>, (310)<001>, (010)<100>, (110)<1 0>, (110) < 1> and (112) < > in Al 2 Cu with body centered tetragonal structure. We found that three edge dislocations with Burgers vector <001> on glide planes (110), (010), and (310), show an extended core and are predicted to be glissile at room and moderate temperatures. Other four edge dislocations associated with slip systems (010)<100>, (110)<1 0>, (110) < 1> and (112) < > and three screw dislocations with Burgers vectors <001>, <110>, and < > show a condensed core, and exhibit significantly higher Peierls barrier for glide at room temperature. Furthermore, the interaction of dislocation dipole associated with slip system (110)<001> results in the climb of the extended-core dislocation at room temperature through three stages: the extended core condenses, the leading partial dislocation climbs accompanying the creation of vacancies (resulting in a non-planar core), and the two partials with non-planar core collectively glide on the neighboring slip planes associated with atomic shuffles.

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Section: Discussionmentioning

confidence: 99%

Atomistic study of fundamental character and motion of dislocations in intermetallic Al2Cu

Zhou

Wang

Misra

et al. 2016

International Journal of Plasticity

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“…This further illuminates the fact that different deformation and strengthening mechanisms can explain similar phenomena. The length scale at which the deformation takes place, the mode of deformation and structure size are important factors that determine the corresponding dislocation mechanism [9,10].…”

Section: Mathematical Backgroundmentioning

confidence: 99%

“…The main difficulty in modeling these patterns lies in the fact that the length scale of these phenomena is not large enough to treat them within the realm of a classical continuum mechanics framework. At the same time, the length scale is not small enough to observe these phenomena within the mechanics of a few dislocations, but rather through a thorough analysis of dislocation dynamics [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Parallel glide: flow of dislocations with internal stress source/sink distribution

Raić

2008

Science and Technology of Advanced Materials

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The unexpected glide of dislocations on a plane parallel to the film/substrate interface in ultrathin copper films, which has been called parallel glide (Balk et al 2003 Acta Metall. 51 447), is described using an analytical model. The phenomenon is observed as a problem involving inlet/outlet flow from different positions of a grain boundary into the grain channel. In this sense, parallel glide is presented as the flow of dislocations with an internal stress source/sink distribution.

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“…Therefore, if there are FR sources of any size less than the size of the crystal grain, there is a optimum one from which a closed dislocation loop is formed at the minimum stress level. The minimum shear stress at which the FR source emits a closed loop was studied with a dislocation dynamics simulation software code [6] for various conditions of grain and FR source sizes and found as a function of grain size d as follows,…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Dislocation-Grain Boundary Interaction and Continuum Mechanics Analyses for Mechanical Properties of Fine Grained Metals

Ohashi

Tsugawa

Ogasawara

2008

MSF

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Macroscopic mechanical response of metal polycrystal with mean grain diameter of 0.2 to 5 microns are simulated by a strain gradient crystal plasticity software code which incorporates some phenomenological models for dislocation accumulation and annihilation, as well as dislocation-grain boundary interactions. Obtained results of macroscopic stress-strain relation show significant increase of yield stress and strain hardening ratio for fine grained specimens.

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Dislocation Dynamics

Cited by 7 publications

References 36 publications

Atomistic study of fundamental character and motion of dislocations in intermetallic Al2Cu

Atomistic study of fundamental character and motion of dislocations in intermetallic Al2Cu

Parallel glide: flow of dislocations with internal stress source/sink distribution

Numerical Modeling of Dislocation-Grain Boundary Interaction and Continuum Mechanics Analyses for Mechanical Properties of Fine Grained Metals

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