A novel experimental approach to determine the absolute grain boundary energy

Molodov, Dmitri A.; Günster, Christoph; Gottstein, Günter; Shvindlerman, L.S.

doi:10.1080/14786435.2012.716167

Cited by 15 publications

(5 citation statements)

References 51 publications

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“…By using the Scherrer equation, the average crystallite size was found to be 34 nm in the as-deposited alloy and increased to 61 nm after annealing. An enthalpy change of À0.11 kJ/mol was evaluated by employing experimental values of grain boundary energy in zinc [9]. This rough calculation shows that grain growth represents a small part of the total enthalpy change (À4.2 kJ/mol).…”

Section: Xrd and Dsc Resultsmentioning

confidence: 99%

Metastable zinc–nickel alloys deposited from an alkaline electrolyte

Magagnin

Nobili

Cavallotti

2014

Journal of Alloys and Compounds

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Section: Xrd and Dsc Resultsmentioning

confidence: 99%

Metastable zinc–nickel alloys deposited from an alkaline electrolyte

Magagnin

Nobili

Cavallotti

2014

Journal of Alloys and Compounds

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“…A magnetic field driving force was used to evaluate the effect of anisotropic GB energy on GB migration in a bicrystal (119). The special geometry included notches on the sample surface that pinned the boundary and prevented it from moving freely.…”

Section: Bicrystalsmentioning

confidence: 99%

Grain Boundary Migration in Polycrystals

Rohrer

Chesser

Krause

et al. 2023

Annu. Rev. Mater. Res.

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Grain boundaries in polycrystalline materials migrate to reduce the total excess energy. It has recently been found that the factors governing migration rates of boundaries in bicrystals are insufficient to explain boundary migration in polycrystals. We first review our current understanding of the atomistic mechanisms of grain boundary migration based on simulations and high-resolution transmission electron microscopy observations. We then review our current understanding at the continuum scale based on simulations and observations using high-energy diffraction microscopy. We conclude that detailed comparisons of experimental observations with atomistic simulations of migration in polycrystals (rather than bicrystals) are required to better understand the mechanisms of grain boundary migration, that the driving force for grain boundary migration in polycrystals must include factors other than curvature, and that current simulations of grain growth are insufficient for reproducing experimental observations, possibly because of an inadequate representation of the driving force. Expected final online publication date for the Annual Review of Materials Research, Volume 53 is July 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…It is already well known that both grain boundary energy and mobility depend on misorientation between adjacent grains and, for a given grain misorientation, on inclination of the boundary plane [12]. A dependence of grain boundary energy on inclination can result in the formation of low energy grain boundary facets [47][48][49][50][51][52][53][54], which in turn can substantially affect grain boundary motion [55][56][57][58][59] and, therefore, be essential for processes of microstructure evolution in polycrystals, such as recrystallization, grain growth and sintering [60][61][62][63][64]. Most of reported observations of grain boundary faceting relate to high angle boundaries with misorientations close to low Σ CSL orientation relationships [47][48][49][50].…”

Section: Effect Of Grain Boundary Character On Motion and Faceting Of...mentioning

confidence: 99%

“…For example, the reduced mobility of a curved 75° 101 0 tilt boundary was ° =1.1×10 -8 m 2 /s [110]. In experiments with zinc bicrystals the grain boundary energy was estimated to be ≅ 0.35 J/m 2 [54]. Accordingly, the absolute boundary mobility amounts to ° ≅ 3.1×10 -8 m 4 /J⋅s, which is in a good agreement with the result obtained for a magnetically driven 101 0 tilt boundary with similar misorientation (76.0°) at 400°C, °= 5.8×10 -8 m 4 /J⋅s.…”

Section: Absolute Grain Boundary Mobility Measured On Bi and Zn Bicry...mentioning

confidence: 99%

Motion of Grain Boundaries: Experiments on Bicrystals

Molodov

2015

Self Cite

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Recent research on grain boundary migration is reviewed. Novel in-situ measuring techniques based on orientation contrast imaging and the experimental results obtained on specially grown bicrystals are presented. Particularly, the investigated faceting and migration behavior of low angle grain boundaries under the curvature force in aluminum bicrystals was addressed. In contrast to the pure tilt boundaries, which remained straight/flat and immobile during annealing at elevated temperatures, mixed tilt-twist boundaries readily assumed a curved shape and steadily moved under the capillary force. Computational analysis revealed that this behavior is due to the inclinational anisotropy of grain boundary energy, which in turn depends on boundary geometry. The migration of planar grain boundaries induced by a magnetic field was measured in bismuth and zinc bicrystals. Various structurally different boundaries were investigated. The results revealed that grain boundary mobility essentially depends on the misorientation angle and the inclination of the boundary plane. Stress driven boundary migration in aluminium bicrystals was observed to be coupled to a tangential translation of the grains. The activation enthalpy of high angle boundary migration was found to vary non-monotonously with misorientation angle, whereas for low angle boundaries the migration activation enthalpy was virtually the same. The motion of the mixed tilt-twist boundaries under stress was observed to be accompanied by both the translation of adjacent grains parallel to the boundary plane and their rotation around the boundary plane normal.

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A novel experimental approach to determine the absolute grain boundary energy

Cited by 15 publications

References 51 publications

Metastable zinc–nickel alloys deposited from an alkaline electrolyte

Metastable zinc–nickel alloys deposited from an alkaline electrolyte

Grain Boundary Migration in Polycrystals

Motion of Grain Boundaries: Experiments on Bicrystals

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