Stress effects on the energy barrier and mechanisms of cross-slip in FCC nickel

Kuykendall, William P.; Wang, Yifan; Cai, Wei

doi:10.1016/j.jmps.2020.104105

Cited by 17 publications

(12 citation statements)

References 32 publications

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“…In fact, Kang et al (2014) showed that both stress components have a comparable effect on the activation enthalpy. This assertion has been thoroughly verified using different formulations of the Line Tension (LT) model (Kang et al, 2014;Liu et al, 2019;Longsworth and Fivel, 2021), linear-elasticity models (Longsworth and Fivel, 2021;Kuykendall et al, 2020) and atomistic simulations (Kang et al, 2014;Esteban-Manzanares et al, 2020;Kuykendall et al, 2020;Liu et al, 2019). Therefore, the influence of all the stress components should be considered in the cross-slip rate.…”

Section: Introductionmentioning

confidence: 80%

“…25. The only free parameter in the theory of Malka-Markovitz and Mordehai ( 2019) is the unstressed energy barrier ∆E 0 , which can be obtained either from line tension models (Kang et al, 2014;Malka-Markovitz and Mordehai, 2019), atomistic simulations (Oren et al, 2017;Liu et al, 2019;Esteban-Manzanares et al, 2020;Kuykendall et al, 2020) or DD simulations (Ramírez et al, 2012;Longsworth and Fivel, 2021). In the present paper, the energy barrier of FCC copper ∆E 0 = 1.9 eV was obtained from DD simulations (Longsworth and Fivel, 2021) to make the work independent of other numerical results.…”

Section: Methodsmentioning

confidence: 96%

See 1 more Smart Citation

Investigating the cross-slip rate in face-centered cubic metals using an atomistic-based cross-slip model in dislocation dynamics simulations

Longsworth

Fivel

2021

Journal of the Mechanics and Physics of Solids

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Section: Introductionmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 96%

Investigating the cross-slip rate in face-centered cubic metals using an atomistic-based cross-slip model in dislocation dynamics simulations

Longsworth

Fivel

2021

Journal of the Mechanics and Physics of Solids

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“…The enthalpy barrier Q cs decreases with the applied shear stress. Kuykendall et al [78] noted that Kubin et al [79] proposed that the Schmid stress on the original glide plane is the most important stress component. It is therefore written as…”

Section: Appendix B: Cross-slip Recovery Modelmentioning

confidence: 99%

Physics-Based Flow Stress Model for Alloy 718

Moretti

Lindgren

Åkerström

2022

Metall Mater Trans A

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A dislocation density-based model for alloy 718 in the annealed state is proposed in order to accurately describe the deformation behavior of this alloy for a wide range of thermo-mechanical loadings. The model accounts for numerous microstructural mechanisms, including strain hardening, grain size effect, dynamic strain aging (DSA), solid solution strengthening, as well as phonon and electron drag which affects dislocation movements at high strain rates. Two types of recovery mechanisms are also included: recovery due to dislocation glide and recovery associated with cross-slip of screw dislocations. The model is calibrated using experimentally determined stress–strain curves for both low and high strain rates in the order of 10–3 to 103 s−1, and for temperatures in the range 20 °C to 800 °C. The stress–strain data computed with the model are in good agreement with the experimental data. The inclusion of DSA is found to be effective in the combination of temperatures and strain rates corresponding to experimental observations. The solid solution strengthening contribution increases with decreasing temperature and increasing strain rate. The drag effect in the model proves to be significant only for deformation at high strain rate (~ 103 s−1).

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“…However, the leading and trailing partials are univocally defined in the presence of a Schmid stress. In that case,û must point towards the bowing-out direction because the energy barrier does not depend on the sign of the Schmid stress [2,4,27] .…”

Section: Elastic Energymentioning

confidence: 99%

“…Recently, W. Kuykendall et al [27] used atomistic simulations to examine the effect of stress on the energy barrier of cross-slip via FE and FL mechanisms in FCC Ni. They concluded that the FE mechanism prevails when the Escaig stress on the glide plane is dominant, and that increasing the Schmid and Escaig stress on the cross-slip plane promotes the FL mechanism.…”

Section: Introductionmentioning

confidence: 99%

The effect of stress on the cross-slip energy in face-centered cubic metals: A study using dislocation dynamics simulations and line tension models

Longsworth

Fivel

2021

Journal of the Mechanics and Physics of Solids

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Dislocation dynamics simulations were used to calculate the energy barrier of cross-slip via Friedel-Escaig mechanism in face centered-cubic copper. The energy barrier in the unstressed case was found to be 1.9 eV, as reported by B. Ramírez et al. [1] . The energy barrier was reduced by applying an external stress. The most effective way of reducing it, was by applying a compressive stress on the glide plane. Furthermore, it was confirmed using dislocation dynamics simulations, that both the Schmid and Escaig stress have a comparable effect in reducing the energy barrier, in qualitative agreement with the atomistic simulations performed by K. Kang et al. [2] in face-centered cubic nickel. Most of the energy barrier values for stressed cross-slip fell within the experimental error of 1.15±0.37 eV measured by J. Bonneville et al. [3] . Moreover, the activation enthalpy obtained from K. Kang's et al. [2] line tension model of cross-slip and the general expression for the activation enthalpy proposed by A. Malka-Markovitz et al. [4] were in good quantitative agreement with the simulation results. Hence, both could be used to calculate the activation enthalpy of screw segments in dislocation dynamics simulations.

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Stress effects on the energy barrier and mechanisms of cross-slip in FCC nickel

Cited by 17 publications

References 32 publications

Investigating the cross-slip rate in face-centered cubic metals using an atomistic-based cross-slip model in dislocation dynamics simulations

Investigating the cross-slip rate in face-centered cubic metals using an atomistic-based cross-slip model in dislocation dynamics simulations

Physics-Based Flow Stress Model for Alloy 718

The effect of stress on the cross-slip energy in face-centered cubic metals: A study using dislocation dynamics simulations and line tension models

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