Mobility of dislocations in aluminum: The role of non-Schmid stress state

Dang, Khanh; Bamney, Darshan; Capolungo, Laurent; Spearot, Douglas E.

doi:10.1016/j.actamat.2019.12.021

Cited by 28 publications

(8 citation statements)

References 34 publications

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“…2 shows no evidence of a plateaued relativistic or dispersive regime for the stress range tested. Indeed, the critical velocity v 0 for crossover into this regime is comparable to the lowest shear wave speed in the solid 12 , and was determined for various other systems to be at least double that of our highest observed velocity of~8 Å/ps 13,16,22,32,35 . Taken together, these two observations indicate that a linear mobility law with nonzero stress at zero velocity suffices in the viscous damping region.…”

Section: Dislocation Mobility Curvessupporting

confidence: 56%

“…However, most DDD simulations in the literature consider only the regions described by Eq. (1), applying the linear drag fit through the regime of lower effective stress range 14,19,28,31,32 . On the other hand, the threshold for the onset of dislocation glide becomes increasingly negligible at elevated temperatures 33 at which thermally-assisted dislocation migration is more pronounced.…”

Section: Introductionmentioning

confidence: 99%

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Temperature and composition dependent screw dislocation mobility in austenitic stainless steels from large-scale molecular dynamics

et al. 2020

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Extensive molecular dynamics simulations are performed to determine screw dislocation mobility in austenitic Fe0.7NixCr0.3-x stainless steels as a function of temperature ranging from 100 to 1300 K, resolved shear stress from 30 to 140 MPa, and Ni composition from 0.0 to 30.0 at%. These mobility data are fitted to a linear mobility law with a nonzero stress offset, referred to as the threshold stress. We find that both the linear drag coefficient and the threshold stress increase with Ni composition. The drag coefficient increases with temperature, whereas the threshold stress decreases with temperature. Based on these calculations, we determine fitting functions for the linear solute drag coefficient as a function of temperature and composition. The mobility laws determined in this study may serve to inform dislocation dynamics simulations pertinent to dislocation network evolution at elevated temperatures for a wide composition range of austenitic stainless steels.

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Section: Dislocation Mobility Curvessupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Temperature and composition dependent screw dislocation mobility in austenitic stainless steels from large-scale molecular dynamics

et al. 2020

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“…1. This was done using the Volterra displacement field with proper treatment of the boundary atoms as demonstrated by previous studies for mobility of dislocations in Al [33,34]. The prismatic slip system is chosen as [1 210] (10 10), while the studied basal slip system is [1 210] (0001).…”

Section: A Molecular Dynamics Study Of Hcp Mgmentioning

confidence: 99%

Limiting velocities and transonic dislocations in Mg

Dang¹,

Blaschke²,

Fensin³

et al. 2022

Preprint

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To accurately predict the mechanical response of materials, especially at high strain rates, it is important to account for dislocation velocities in these regimes. Under these extreme conditions, it has been hypothesized that dislocations can move faster than the speed of sound. However, the presence of such dislocations remains elusive due to challenges associated with measuring these experimentally. In this work, molecular dynamics simulations were used to investigate the dislocation velocities for the basal edge, basal screw, prismatic edge, and prismatic screw dislocations in Mg in the sub-, trans-, and supersonic regimes. Our results show that only prismatic edge dislocations achieve supersonic velocities. Furthermore, this work demonstrates that the discrepancy between the theoretical limiting velocity and the MD results for Mg is due to its sensitivity to large hydrostatic stress around the dislocation core, which was not the case for fcc metals such as Cu.

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“…To overcome the aforementioned shortcomings, alternative assay systems should possess rapid, accuracy, visible and cost effective merits. Tremendous portable probes with the convenient simple operation have been extended based on fluorescent and colorimetric nanomaterials, such as carbon dots, [11] quantum dots, [12] silicon nanoparticles, [13] metal nanoparticles [14] . Metal nanoparticle‐based (such as gold (Au), silver (Ag) nanoparticles) sensing systems have been developed for detecting the levels of ions and biomolecules in environmental and biological samples due to possessing unique optical properties surface plasmon resonance (SPR) [15] …”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles for Colorimetric Detection and Discrimination of Mercury Ions in Lake Water

Zou

Pang

Zhang³

et al. 2021

ChemistrySelect

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As the most toxic heavy metal, mercury (Hg) has been considered as the greatest environmental threat and it reach ubiquitous in industrial waste water and extended to environment. The detection of Hg 2 + in environmental water is a crucial work for both protecting the environment and human health. Colorimetric assay exhibits visual discriminating and simple readout. This work presents the selective sensing of metal ion (Hg 2 + ) by silver particles (Ag NPs), which were functionalized by galactosamine and synthesized via simple one pot method, with the average particle diameter of 18.75 � 0.49 nm. The limit of detection (LOD) was calculated as low as 7.92 nM. The colorimetric probe can also be performed in real water sample with good selectivity, and recovery was found to be 95-102 %, indicating can be used for on-line determination of Hg 2 + in the complex aqueous solutions. Additionally, the good catalytic performance of Ag NPs was demonstrated by hydrogenation of p-nitrophenol and potassium ferricyanide in water samples.

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Mobility of dislocations in aluminum: The role of non-Schmid stress state

Cited by 28 publications

References 34 publications

Temperature and composition dependent screw dislocation mobility in austenitic stainless steels from large-scale molecular dynamics

Temperature and composition dependent screw dislocation mobility in austenitic stainless steels from large-scale molecular dynamics

Limiting velocities and transonic dislocations in Mg

Silver Nanoparticles for Colorimetric Detection and Discrimination of Mercury Ions in Lake Water

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