On shear coupled migration of low angle grain boundaries

Brandenburg, Jann-Erik; Molodov, Dmitri A.

doi:10.1016/j.scriptamat.2019.01.009

Cited by 15 publications

(4 citation statements)

References 50 publications

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“…7). These apparent mobility values are comparable with those determined based on bicrystal grain boundary migration under applied stresses in the same temperature range [33][34][35][36][37]. Grain #1 exhibits the largest average apparent mobility at 380 • C of 0.67-1.07 × 10 − 12 m 2 /s/J, which could explain why the growth of grain #1 outmatches the concurrent recovery of the region under indent side IV.…”

Section: Boundary Mobilitysupporting

confidence: 81%

“…Previous studies, involving either bicrystals or polycrystals, have shown that boundary motion can be driven by external stresses [35,36,44,45]. For example, in the bicrystal experiments, very small external stresses in the range 0.1-0.5 MPa, corresponding roughly to elastic strain levels of 1-4 × 10 − 6 (estimated using ε=σ/E and E = 70 GPa for pure Al), have been found to be sufficient for driving boundary migration at temperatures of 300-400 • C. In contrast, the elastic strains observed within the recrystallizing grains in the present sample are two orders of magnitude higher and thus are expected to have a significant impact on the growth of these grains.…”

Section: Effects Of the Deformation Microstructure And Residual Stressesmentioning

confidence: 99%

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Selective Growth of Recrystallizing Grains into Well-Characterized Deformed Aluminum at Hardness Indentation

Zhang,

Ludwig

2023

Preprint

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Section: Boundary Mobilitysupporting

confidence: 81%

Section: Effects Of the Deformation Microstructure And Residual Stressesmentioning

confidence: 99%

Selective Growth of Recrystallizing Grains into Well-Characterized Deformed Aluminum at Hardness Indentation

Zhang,

Ludwig

2023

Preprint

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“…As it is known and recently confirmed by the experimental study [51], the migration step of the symmetric tilt grain boundaries consists of normal GB migration coupled to the tangential GB shear. On the other hand, as mentioned in [52], sliding does not appear in case of twist and general GB's.…”

Section: Resultsmentioning

confidence: 53%

Molecular Dynamics Study of the Hydrogen and Carbon Effect on Mobility of Grain Boundaries in $\alpha$-Iron

Teus¹,

Gavriljuk²

2019

Metallofiz. Noveishie Tekhnol.

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The effect of hydrogen and carbon on the mobility of a grain boundary in the α-iron is studied by means of molecular dynamics. The calculations are performed within the linear elasticity approach. Both hydrogen and carbon atoms reveal a strong tendency to grain boundary segregation. As shown, the hydrogen atoms, located in the vicinity of the grain boundaries, decrease the activation enthalpy of grain boundary migration, which results in their higher mobility in comparison with the hydrogen-free case. In contrast, the carbon atoms strongly pin the grain boundary at its initial position within the whole range of temperatures and also under the strain used in the modelling. The obtained results are interpreted based on the opposite effect of the studied interstitial elements on the atomic interactions: the increase in the concentration of free electrons due to hydrogen and its decrease due to carbon. As supposed, the hydrogen-caused increase of grain boundaries mobility can be a reason for the early start of recrystallization, as it is observed in the hydrogen-charged iron-based alloys.

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“…Despite many efforts on probing the twinning and detwinning behaviors in Mg alloys, the TB migration mechanism was still unclear. Therefore, in this paper, the shear-couple grain migration method which had been successfully used in Face-Centered Cubic and Body-Centered Cubic materials [30,31,32,33,34,35,36,37] was carried out by molecular dynamics simulation. The influence of the strain rates and loading directions on the growth and shrinkage mechanism of {10true1¯2} extension twin are studied.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulation on the Twin Boundary Migration in Mg under Shear Deformation

Song

Wang

et al. 2019

Materials

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In this paper, the {10true1¯2} twinning and detwinning was studied by molecular dynamics simulation under different shear directions and strain rates. The results showed that the twin was thickened under [true1¯011] shear direction and shrunken with shearing in the opposite direction. The critical resolved shear stress of {10true1¯2} twin boundary migration increased with the increase of the strain rate. By analyzing the atom’s displacement, it was concluded that the {10true1¯2} twin migration was achieved by both the shear and the atomic shuffling. Every atom would be affected by the shear, and different shear directions would cause opposite move directions, which led to twinning or detwinning. The atom shuffling was only used for adjusting the glide twin boundary and mirror-symmetric twin boundary structure evolution.

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On shear coupled migration of low angle grain boundaries

Cited by 15 publications

References 50 publications

Selective Growth of Recrystallizing Grains into Well-Characterized Deformed Aluminum at Hardness Indentation

Selective Growth of Recrystallizing Grains into Well-Characterized Deformed Aluminum at Hardness Indentation

Molecular Dynamics Study of the Hydrogen and Carbon Effect on Mobility of Grain Boundaries in $\alpha$-Iron

Atomistic Simulation on the Twin Boundary Migration in Mg under Shear Deformation

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