Low-energy configurations of symmetric and asymmetric tilt grain boundaries

Merkle, K. L.; Wolf, D.

doi:10.1080/01418619208201536

Cited by 118 publications

(47 citation statements)

References 32 publications

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“…[15] Gleiter [33] also reported AGG structures have been made with high resolution electron microscopy, [37,38,39] but they all show low index planes of in Pb at temperatures below the defaceting temperature. Simpson et al [34] also reported AGG in pure Pb, Cd, and their one of the grains coinciding with the faceted grain boundary plane.…”

Section: Methodsmentioning

confidence: 95%

The dependence of normal and abnormal grain growth in silver on annealing temperature and atmosphere

Koo

Yoon

2001

Metall Mater Trans A

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When polycrystalline pure Ag specimens are compressed to 40 pct and annealed, there is no noticeable texture in the recrystallized structure, and normal or abnormal grain growth occurs during annealing. When annealed further in low vacuum (10 Ϫ3 to 10 Ϫ4 Torr) after the completion of recrystallization, normal grain growth occurs at 920 ЊC and 800 ЊC, but abnormal grain growth (AGG) occurs at 700 ЊC, 600 ЊC, and 500 ЊC. When annealed in O 2 atmosphere, normal grain growth occurs at 920 ЊC and AGG at 800 ЊC, 700 ЊC, 600 ЊC, and 500 ЊC. At temperatures close to the melting point (960.5 ЊC), the grain boundaries are expected to be rough at atomic scales and hence have nearly isotropic boundary energy. The normal growth of the grains with such atomically rough boundary structures is consistent with some theoretical analysis and simulation. At low temperatures, the grain boundaries can be faceted with probably singular structures. Because these grain boundaries apparently migrate by the movement of boundary steps, AGG occurs. The observations with optical microscopy indeed indicate that some grain boundaries are faceted at low temperatures and all of them are smoothly curved indicating an atomically rough structure at high temperatures close to the melting point. Although the results are not conclusive, they support the hypothesis that AGG occurs because the faceted singular grain boundaries migrate by the step mechanism.

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Section: Methodsmentioning

confidence: 95%

The dependence of normal and abnormal grain growth in silver on annealing temperature and atmosphere

Koo

Yoon

2001

Metall Mater Trans A

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“…It has been shown that twist boundaries on low-index planes have low energy (and, hence, special properties). [15] In addition, asymmetrical tilt boundaries on certain misorientation axes have low energy [16] and frequently have a low-index plane on one side of the boundary. With regard to the R9 system, there are two symmetrical tilt boundaries (a twist boundary with a twist angle of zero) on {221} and {114} and several asymmetrical tilt boundaries having a low-index plane on one side of the boundary.…”

Section: Introductionmentioning

confidence: 99%

The Role of Σ9 Boundaries in Grain Boundary Engineering

Randlè

Coleman

Waterton

2010

Metall Mater Trans A

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In a grain-boundary-engineered (GBE) microstructure, R9 boundaries are the second most abundant boundary type. This article presents data showing that, in GBE copper, most R9s were special. R9 boundaries are also a geometrically necessary component of a GBE microstructure. It is suggested that there are competing requirements for R9s; during iterative GBE processing, they are required to be mobile, whereas afterward, it is desirable that they are special boundaries.

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“…GB faceting is a generic phenomenon displayed by many materials [12,216], in which an initially flat boundary spontaneously develops a sawtooth profile in a manner similar to phase transitions [12,224,226,[239][240][241]. The faceting transition can lead to asymmetrical facets even if the average orientation of the boundary plane is symmetric, and vice versa.…”

Section: Grain Boundary Structurementioning

confidence: 99%

Atomistic modeling of interfaces and their impact on microstructure and properties

2010

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Atomic-level modeling of materials provides fundamental insights into phase stability, structure and properties of crystalline defects, and to physical mechanisms of many processes ranging from atomic diffusion to interface migration. This knowledge often serves as a guide for the development of mesoscopic and macroscopic continuum models, with input parameters provided by atomistic models. This paper gives an overview of the most recent developments in the area of atomistic modeling with emphasis on interfaces and their impact on microstructure and properties of materials. Modern computer simulation methodologies are discussed and illustrated by several applications related to thermodynamic, kinetic and mechanical properties of materials. Existing challenges and future research directions in this field are outlined.

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Low-energy configurations of symmetric and asymmetric tilt grain boundaries

Cited by 118 publications

References 32 publications

The dependence of normal and abnormal grain growth in silver on annealing temperature and atmosphere

The dependence of normal and abnormal grain growth in silver on annealing temperature and atmosphere

The Role of Σ9 Boundaries in Grain Boundary Engineering

Atomistic modeling of interfaces and their impact on microstructure and properties

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