Strengthening mechanisms of iron micropillars

Rogne, Bjørn Rune Sørås; Thaulow, Christian

doi:10.1080/14786435.2014.984004

Cited by 42 publications

(42 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of that associated with [001] tensile loading for bcc Fe is approximately 0.47 and 0.41 on the {112} as the primary and {110} as the secondary defect activation planes in h111i directions, respectively. 60 Our results demonstrate that the dislocation activity occurs in the most preferred {112}h111i primary slip system in both pure and oxide-coated Fe NWs, according to the dynamic process, as reported in a similar molecular dynamics simulation by Li et al Our results are also consistent with the proposed Schmid law. 31 However, bcc materials do not obey Schmid's law in most cases.…”

Section: The Role Of Oxidation In the Tensile Deformation Behaviorsupporting

confidence: 81%

“…60 At the atomistic level, defect nucleation in bulk crystal materials has to overcome significant resistance to propagate across the gliding plane-a mechanism that is quantitatively predicted by the Schmid factor. The value of that associated with [001] tensile loading for bcc Fe is approximately 0.47 and 0.41 on the {112} as the primary and {110} as the secondary defect activation planes in h111i directions, respectively.…”

Section: The Role Of Oxidation In the Tensile Deformation Behaviormentioning

confidence: 99%

“…Thus, in the experimental studies of bcc Fe pillars, dislocations caused by compressive force are activated more dominantly along the slip {110} planes instead of the expected {112} planes. 60 Although partial dislocations propagate over the same {112}h111i slip system, the time required for the migration process-from the onset of the initial partial dislocation to finally reaching full straight twin boundary on the {112} glide plane-is measured at $2.0 ps and $5.3 ps for the pure and oxide-coated Fe NWs, respectively. However, comparing the cross-slip partial dislocation propagation speeds for NWs with and without the oxide shell layer, the oxide shell layer impedes the escape of initial partial dislocation, which increases as the oxide shell layer thickness decreases.…”

Section: The Role Of Oxidation In the Tensile Deformation Behaviormentioning

confidence: 99%

See 2 more Smart Citations

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Aral

Wang

Ogata

et al. 2016

Journal of Applied Physics

View full text Add to dashboard Cite

The influence of oxidation on the mechanical properties of nanostructured metals is rarely explored and remains poorly understood. To address this knowledge gap, in this work, we systematically investigate the mechanical properties and changes in the metallic iron (Fe) nanowires (NWs) under various atmospheric conditions of ambient dry O 2 and in a vacuum. More specifically, we focus on the effect of oxide shell layer thickness over Fe NW surfaces at room temperature. We use molecular dynamics (MD) simulations with the variable charge ReaxFF force field potential model that dynamically handles charge variation among atoms as well as breaking and forming of the chemical bonds associated with the oxidation reaction. The ReaxFF potential model allows us to study large length scale mechanical atomistic deformation processes under the tensile strain deformation process, coupled with quantum mechanically accurate descriptions of chemical reactions. To study the influence of an oxide layer, three oxide shell layer thicknesses of $4.81 Å , $5.33 Å , and $6.57 Å are formed on the pure Fe NW free surfaces. It is observed that the increase in the oxide layer thickness on the Fe NW surface reduces both the yield stress and the critical strain. We further note that the tensile mechanical deformation behaviors of Fe NWs are dependent on the presence of surface oxidation, which lowers the onset of plastic deformation. Our MD simulations show that twinning is of significant importance in the mechanical behavior of the pure and oxide-coated Fe NWs; however, twin nucleation occurs at a lower strain level when Fe NWs are coated with thicker oxide layers. The increase in the oxide shell layer thickness also reduces the external stress required to initiate plastic deformation. Published by AIP Publishing.

show abstract

Section: The Role Of Oxidation In the Tensile Deformation Behaviorsupporting

confidence: 81%

Section: The Role Of Oxidation In the Tensile Deformation Behaviormentioning

confidence: 99%

Section: The Role Of Oxidation In the Tensile Deformation Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Aral

Wang

Ogata

et al. 2016

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Results for ½001 oriented pillars from [39] are in several instances included for comparison and the original data have been further analysed in this paper. All orientations are visualized in the ½001-½011-½111 triangle in the [001] stereographic projection of cubic crystals in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…In a recent paper [39] we examined the size effect of iron pillars with ½001 crystallographic orientation. The underlying deformation mechanisms in the specific size regimes can be summarized from Fig.…”

Section: Introductionmentioning

confidence: 99%

Effect of crystal orientation on the strengthening of iron micro pillars

Rogne

Thaulow

2015

Materials Science and Engineering: A

View full text Add to dashboard Cite

Nanoglass–Nanocrystal Composite—a Novel Material Class for Enhanced Strength–Plasticity Synergy

Katnagallu

Singh

et al. 2020

Small

View full text Add to dashboard Cite

The properties of a material can be engineered by manipulating its atomic and chemical architecture. Nanoglasses which have been recently invented and comprise nanosized glassy particles separated by amorphous interfaces, have shown promising properties. A potential way to exploit the structural benefits of nanoglasses and of nanocrystalline materials is to optimize the composition to obtain crystals forming within the glassy particles. Here, a metastable Fe‐10 at% Sc nanoglass is synthesized. A complex hierarchical microstructure is evidenced experimentally at the atomic scale. This bulk material comprises grains of a Fe90Sc10 amorphous matrix separated by an amorphous interfacial network enriched and likely stabilized by hydrogen, and property‐enhancing pure‐Fe nanocrystals self‐assembled within the matrix. This composite structure leads a yield strength above 2.5 GPa with an exceptional quasi‐homogeneous plastic flow of more than 60% in compression. This work opens new pathways to design materials with even superior properties.

show abstract

Strengthening mechanisms of iron micropillars

Cited by 42 publications

References 65 publications

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Effect of crystal orientation on the strengthening of iron micro pillars

Nanoglass–Nanocrystal Composite—a Novel Material Class for Enhanced Strength–Plasticity Synergy

Contact Info

Product

Resources

About