Atomistic simulations of dislocation–precipitate interactions emphasize importance of cross-slip

Singh, Chandra Veer; Mateos, Arturo J.; Warner, D.H.

doi:10.1016/j.scriptamat.2010.10.041

Cited by 63 publications

(34 citation statements)

References 25 publications

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“…2a). The CNA parameters indicate the atomic structure after the dislocation bypassing particle [8][9][10][11][12], and the corresponding microstructural evolution is directly observed in Figs. 3 and 4.…”

Section: Resultsmentioning

confidence: 99%

“…Over the past few years, some numerical investigations [10][11][12][13] have been done in this field. On the one hand, some experiments [14][15][16][17] and theoretical models [18,19] show that the strengthening behaviors of PRMMNCs are primarily attributed to the dislocation strengthening effect and the load-transfer effect.…”

Section: Introductionmentioning

confidence: 99%

“…They found the critical shear stress and the strengthening mechanism from dislocations bypassing GP zones is found to vary significantly depending upon the GP zone size and orientation. Subsequently, the cross-slip at zero and finite temperatures causes either significantly reducing or enhancing precipitate strengthening, relying upon the orientation of the dislocation-GP zone interaction [12]. Recently, Saroukhani et al [27] predicted the rate at which dislocations bypass obstacles to understand the microscopic features that control the plastic behaviors of multi-component alloys, and showed the strain rate sensitivity of the individual dislocation-obstacle interactions.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, using MD simulations and 3D discrete dislocation dynamics simulations, Lehtinen et al [26] studied the different kinds of precipitates interacting with edge dislocation in BCC Fe, and discussed the variety of the relevant pinning/depinning mechanisms during the dislocation bypassing precipitate. Although a large number of recent studies have been performed on the strengthening mechanism of the ductile metal particles in PRMMCs [10][11][12][13][14][15][16][17][18][19][25][26][27][28][29][30], the brittle SiC particles on the mechanical properties of Cu matrix have been reported hardly at nanoscale.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Atomic-scale strengthening mechanism of dislocation-obstacle interaction in silicon carbide particle-reinforced copper matrix nanocomposites

Liu

Fang

et al. 2017

Ceramics International

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Atomic-scale strengthening mechanism of dislocation-obstacle interaction in silicon carbide particle-reinforced copper matrix nanocomposites

Liu

Fang

et al. 2017

Ceramics International

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“…Although efforts to understand dislocation-obstacle interactions span more than 60 years (e.g., Orowan, 1948), the use of atomistic simulations to attempt to quantify parameters such as obstacle strength are relatively new (e.g., Bacon, 2009). In Singh (Singh, 2011), the cutting of Guinier-Preston (GP) zones via cross-slip was modeled. GP zones are nanometer-scale monolayered disks that form during the early stages of age hardening and are common to many alloys including Al-Cu.…”

Section: Discrete Dislocation Plasticitymentioning

confidence: 99%

Modeling and Characterization of Damage Processes in Metallic Materials

Glaessgen

Saether

Smith

et al. 2011

52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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This paper describes a broad effort that is aimed at understanding the fundamental mechanisms of crack growth and using that understanding as a basis for designing materials and enabling predictions of fracture in materials and structures that have small characteristic dimensions. This area of research, herein referred to as Damage Science, emphasizes the length scale regimes of the nanoscale and the microscale for which analysis and characterization tools are being developed to predict the formation, propagation, and interaction of fundamental damage mechanisms. Examination of nanoscale processes requires atomistic and discrete dislocation plasticity simulations, while microscale processes can be examined using strain gradient plasticity, crystal plasticity and microstructure modeling methods. Concurrent and sequential multiscale modeling methods are being developed to analytically bridge between these length scales. Experimental methods for characterization and quantification of near-crack tip damage are also being developed. This paper focuses on several new methodologies in these areas and their application to understanding damage processes in polycrystalline metals. On-going and potential applications are also discussed.

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Plastic Deformation of a Nano‐Precipitate Strengthened Ni‐Base Alloy Investigated by Complementary In Situ Neutron Diffraction Measurements and Molecular‐Dynamics Simulations

Huang

Csiszár

et al. 2012

Adv Eng Mater

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In situ neutron‐diffraction experiments at the spallation neutron source, simultaneously illuminating the diffraction of the matrix and the strengthening nano precipitates, allow the determination of their plastic deformation. An irreversible neutron‐diffraction‐profile evolution of the nano precipitates is observed. However, there is no conclusive trend of the nano‐precipitate peak‐width evolution subjected to the greater stress levels. Hence, in the present work, molecular‐dynamics simulations are applied to reveal the deformation mechanisms of the nano precipitate and its interaction with the surrounding matrix. The microstructure size, dislocation content, and structural parameters of the nano precipitates, quantified by X‐ray, transmission electron microscopy, and small‐angle neutron scattering, are used as the simulation input and reference. The simulation results show that there are two competing deformation mechanisms, which lead to the fluctuation of the nano‐precipitate‐diffraction widths, occurring during the higher plastic deformation stages.

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Atomistic simulations of dislocation–precipitate interactions emphasize importance of cross-slip

Cited by 63 publications

References 25 publications

Atomic-scale strengthening mechanism of dislocation-obstacle interaction in silicon carbide particle-reinforced copper matrix nanocomposites

Atomic-scale strengthening mechanism of dislocation-obstacle interaction in silicon carbide particle-reinforced copper matrix nanocomposites

Modeling and Characterization of Damage Processes in Metallic Materials

Plastic Deformation of a Nano‐Precipitate Strengthened Ni‐Base Alloy Investigated by Complementary In Situ Neutron Diffraction Measurements and Molecular‐Dynamics Simulations

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