Grain boundary curvature and particle pinning in an Al–1mass%Mn alloy

2004 ◽  
Vol 50 (11) ◽  
pp. 1373-1377 ◽  
Author(s):  
P Rios
Keyword(s):  
Grain Boundary ◽  
Boundary Curvature

The Influence of Anisotropic Grain Boundary Energy on Triple Junction Morphology and Grain Growth

1998 ◽  
Vol 529 ◽  
Author(s):  
Alexander H. King
Keyword(s):  
Grain Boundary ◽  
Triple Junction ◽  
Driving Force ◽  
Boundary Migration ◽  
Boundary Energy ◽  
Dihedral Angles ◽  
Grain Boundary Migration ◽  
Grain Boundary Energy ◽  
Boundary Curvature ◽  
Energy Anisotropy

AbstractWe consider some examples of triple junction equilibration in the presence of grain boundary energy anisotropy. It is shown that the presence of one or two cusp-trapped grain boundaries can reduce the restrictions upon the dihedral angles formed with the remaining (isotropic) boundaries This allows for a reduction in the average grain boundary curvature, and thus in the driving force for grain boundary migration.

In Situ TEM Analysis of Facet Motion in Gold Σ=3 {112} Boundaries

2001 ◽  
Vol 7 (S2) ◽  
pp. 324-325
Author(s):  
D.L. Medlin
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Microstructural Evolution ◽  
Experimental Studies ◽  
In Situ Tem ◽  
Tem Analysis ◽  
Computational Approaches ◽  
Boundary Properties ◽  
Boundary Curvature

Interfacial anisotropy complicates the prediction of microstructural evolution, particularly ir extreme cases for which the presence of facets and corners prevents the application of classical notions of grain-boundary curvature. Although there has been much effort at incorporating anisotropic grain-boundary properties, including faceted geometries, into computational approaches for microstructural evolution, at present our mechanistic understanding of the behavior of facets anc their junctions remains limited. In this presentation, we investigate the development of faceted boundaries between Σ=3 <111> oriented grains in epitaxially deposited gold thin films. This system is well suited tc experimental studies of facet evolution since the crystallography and structure of the boundaries is already well understood. It is well known that “double-positioning” of epitaxially aligned <111> grains on a surface of three-fold or six-fold symmetry results in a microstructure composed of grains in two twin-related (Σ=3) variants that are separated by facets running vertically through the film and forming 120 degree corners [1,2].

On the Validation of the Monte Carlo Technique in Simulation of Grain Growth in Small, Two-Dimensional Systems

2007 ◽  
Vol 558-559 ◽  
pp. 1087-1092
Author(s):  
Ola Hunderi ◽  
Knut Marthinsen ◽  
Nils Ryum
Keyword(s):  
Monte Carlo ◽  
Grain Boundary ◽  
Grain Growth ◽  
Computer Simulations ◽  
Two Dimensions ◽  
Theoretical Treatment ◽  
Two Dimensional ◽  
Simulation Techniques ◽  
Boundary Curvature ◽  
Kinetics Of

The kinetics of grain growth in real systems is influenced by several unknown factors, making a theoretical treatment very difficult. Idealized grain growth, assuming all grain boundaries to have the same energy and mobility (mobility M = k/ρ, where k is a constant and ρ is grain boundary curvature) can be treated theoretically, but the results obtained can only be compared to numerical grain growth simulations, as ideal grain growth scarcely exists in nature. The validity of the simulation techniques thus becomes of great importance. In the present investigation computer simulations of grain growth in two dimensions using Monte Carlo simulations and the grain boundary tracking technique have been investigated and compared in small grain systems, making it possible to follow the evolution of each grain in the system.

scholarly journals Thermal Spike Model of Ion-Induced Grain Growth

1990 ◽  
Vol 202 ◽  
Author(s):  
Dale E. Alexander ◽  
Gary S. Was
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Ion Irradiation ◽  
Recoil Energy ◽  
Thermal Spike ◽  
Grain Boundary Mobility ◽  
Thermal Spike Model ◽  
Spike Model ◽  
Model Predictions ◽  
Boundary Curvature

ABSTRACTA thermal spike model has been developed to describe the phenomenon of ion irradiation-induced grain growth in metal alloy thin films. In single phase films where the driving force for grain growth is the reduction of grain boundary curvature, the model shows that ion-induced grain boundary mobility, Mion, is proportional to the quantity FD2/ΔHcoh3, where FD is the ion and recoil energy deposited in nuclear interactions and ΔHcoh is the cohesive energy of the element or alloy. Experimental grain growth results from ion irradiated coevaporated binary alloy films compare favorably with model predictions.

scholarly journals The five-parameter grain boundary curvature distribution in an austenitic and ferritic steel

2017 ◽  
Vol 123 ◽  
pp. 136-145 ◽  
Author(s):  
Xiaoting Zhong ◽  
David J. Rowenhorst ◽  
Hossein Beladi ◽  
Gregory S. Rohrer
Keyword(s):  
Grain Boundary ◽  
Ferritic Steel ◽  
Boundary Curvature ◽  
Curvature Distribution

Measuring and Modeling Grain, Grain Boundary and Grain Edge Average Curvature and their Application to Grain Growth

2007 ◽  
Vol 539-543 ◽  
pp. 2530-2535 ◽  
Author(s):  
Paulo Rangel Rios ◽  
G.S. Fonseca
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Volume Fraction ◽  
Boundary Migration ◽  
Special Importance ◽  
Average Curvature ◽  
Interface Curvature ◽  
Boundary Curvature ◽  
Grain Boundary Pinning ◽  
Individual Grains

Alongside volume fraction, VV, and area per unit of volume, SV, the integral interface curvature per unit of volume, MV, or the average interface curvature, H, are important microstructural descriptors. For grain growth, the grain boundary curvature is of special importance because, in addition to its geometrical significance, it is also the driving force for boundary migration. Notwithstanding its importance, curvature has been seldom measured and utilized in the analysis of polycrystals. Geometrical models were derived for the average curvature of individual grains, of grain boundaries and of grain edges, as a function of the mean intercept length. These models show good agreement with curvature measurements in an Al-1mass%Mn alloy. Furthermore, this work shows how grain boundary curvature measurement can be applied to normal grain growth as well as to the effect of particles on grain boundary pinning.

Abnormal Grain Growth Topology and Kinetics

2007 ◽  
Vol 539-543 ◽  
pp. 2401-2406
Author(s):  
Paulo Rangel Rios ◽  
Martin E. Glicksman
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Common Point ◽  
The Matrix ◽  
Boundary Curvature ◽  
Number Of Faces

One common point amongst extant theories of abnormal grain growth (AGG) is that they treat this phenomenon in terms of the relative grain size, or grain radius, of the abnormal grains. Topological and metrical quantities of abnormal grains, such as the number of their faces, or their grain boundary curvature, are taken into account only indirectly through the grain size itself. This paper, by contrast, treats AGG in terms of concepts, that include both the boundary curvature and the number of faces of the abnormal grain. Two cases are examined: 1) AGG, in which the matrix grains are fully pinned, so normal grain growth cannot occur; 2) AGG in which the matrix grains are free to evolve, so that normal grain growth ensues simultaneously in the matrix.

Grain Boundary Curvature in Polycrystalline Metallic Thin Films

2000 ◽  
Vol 615 ◽  
Author(s):  
Alexander H. King ◽  
Rakesh Mangat ◽  
Kwame Owusu-Boahen
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Film Thickness ◽  
Sheet Thickness ◽  
Film Plane ◽  
Thickness Effect ◽  
Metallic Thin Films ◽  
Boundary Curvature ◽  
Grain Boundary Grooves

ABSTRACTWell-annealed thin films are typically observed to exhibit mean grain diameters that are approximately equal to the film thickness. The standard explanation of this “sheet thickness effect” is that it results from a balance of grain boundary curvature in two different directions which, in turn, results from pinning at grain boundary grooves. TEM experiments have been performed to assess this model, and it is found that the predicted curvature about axes in the film plane is absent. Alternate explanations of the sheet thickness effect are considered.

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