Conditions for the Occurrence of Abnormal Grain Growth Studied by a 3 D Vertex Dynamics Model

2012 ◽  
Vol 715-716 ◽  
pp. 563-567 ◽  
Author(s):  
M. Syha ◽  
D. Weygand
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Boundary Energy ◽  
Mean Field ◽  
Three Dimensional ◽  
Abnormal Grain Growth ◽  
Dynamics Model ◽  
Boundary Properties ◽  
The Impact ◽  
Field Approaches

The conditions for the nucleation of abnormal grain growth were investigated using a three dimensional vertex dynamics model. Potentially abnormal growing grains characterized by their size and topological class, respectively and embedded in an isotropic grain ensemble were subjected to annealing varying their grain boundary properties. The simulation results indicate that the classical mean field approaches underestimate the role of the grain boundary energy advantage, while the impact of a mobility advantage is overestimated.

Monte-Carlo Simulation of Goss Abnormal Grain Growth in Fe-3%Si Steel by Sub-Boundary Enhanced Solid-State Wetting

2012 ◽  
Vol 715-716 ◽  
pp. 146-151
Author(s):  
K.J. Ko ◽  
A.D. Rollett ◽  
N.M. Hwang
Keyword(s):  
Monte Carlo ◽  
Solid State ◽  
Grain Boundary ◽  
Grain Growth ◽  
Boundary Energy ◽  
Three Dimensional ◽  
Abnormal Grain Growth ◽  
Grain Boundary Energy ◽  
Simulation Based ◽  
Mc Simulation

The selective abnormal grain growth (AGG) of Goss grains in Fe-3%Si steel was investigated using a parallel Monte-Carlo (MC) simulation based on the new concept of sub-boundary enhanced solid-state wetting. Goss grains with low angle sub-boundaries will induce solid-state wetting against matrix grains with a moderate variation in grain boundary energy. Three-dimensional MC simulations of microstructure evolution with textures and grain boundary distributions matched to experimental data is using in this study.

Modeling the Impact of Grain Boundary Properties on Microstructural Evolution

2004 ◽  
Vol 467-470 ◽  
pp. 707-714 ◽  
Author(s):  
Anthony D. Rollett
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Microstructural Evolution ◽  
Boundary Energy ◽  
Grain Boundary Energy ◽  
Fcc Metals ◽  
Growth Selection ◽  
Component Development ◽  
Boundary Properties ◽  
The Impact

Much new knowledge has been gained on the properties of grain boundaries that are relevant to processes of microstructural evolution such as grain growth and recrystallization. For mobility, a combination of experiments and numerical simulation has reinforced many of the classical concepts of special crystallographic types with either exceptionally high or exceptionally low mobilities. At another level, the anisotropy of energy of (especially) mobility has long been assumed to play an important role in both grain growth and recrystallization. The process of “micro-growth selection” is assumed to favor, in fcc metals, the development of cube-oriented nuclei in the early stages of recrystallization. We describe simulations in which initial microstructures with varying degrees of verisimilitude to as-deformed microstructures are used, as well as various assumptions about the grain boundary energy and mobility. From these one it is apparent that the anisotropy does indeed effectively promote the cube component development.

Comparison of Experimental and Computational Aspects of Grain Growth in Al-Foil

2000 ◽  
Vol 652 ◽  
Author(s):  
Melik C. Demirel ◽  
Andrew P. Kuprat ◽  
Denise C. George ◽  
Bassem S. El-Dasher ◽  
Neil N. Carlson ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Three Dimensional ◽  
Interface Energy ◽  
Grain Structure ◽  
Electron Backscattered Diffraction ◽  
Boundary Properties ◽  
Ebsd Technique ◽  
Columnar Grain ◽  
Grain Boundary Motion

ABSTRACTGrain boundary and crystallographic orientation information of an Al-foil with a columnar grain structure is characterized by Electron Backscattered Diffraction (EBSD) technique. The starting microstructure and grain boundary properties are implemented as an input for the three- dimensional grain growth simulation. In the computational model, minimization of the interface energy is the driving force for the grain boundary motion. The computed evolved microstructure is compared with the final experimental microstructure, after annealing at 550 °C. Good agreement is observed between the experimentally obtained microstructure and the simulated microstructure. The constitutive description of the grain boundary properties was based on a 1- parameter characterization of the variation in mobility with misorientation angle.

New Understanding of Abnormal Grain Growth Approached by Solid-State Wetting along Grain Boundary or Triple Junction

2004 ◽  
Vol 467-470 ◽  
pp. 745-750 ◽  
Author(s):  
Nong Moon Hwang
Keyword(s):  
Solid State ◽  
Grain Boundary ◽  
Grain Growth ◽  
Triple Junction ◽  
Boundary Energy ◽  
Growth Front ◽  
Abnormal Grain Growth ◽  
Boundary Mobility ◽  
Grain Boundary Mobility ◽  
Mc Simulation

Although it has been generally believed that the advantage of the grain boundary mobility induces abnormal grain growth (AGG), it is suggested that the advantage of the low grain boundary energy, which favors the growth by solid-state wetting, induces AGG. Analyses based on Monte Carlo (MC) simulation show that the approach by solid-state wetting could explain AGG much better than that by grain boundary mobility. AGG by solid-state wetting is supported not only by MC simulations but also by the experimental observation of microstructure evolution near or at the growth front of abnormally growing grain. The microstructure shows island grains and solid-state wetting along grain boundary and triple junction.

Role of Interfaces in Coarsening and Grain Growth

1991 ◽  
Vol 229 ◽  
Author(s):  
S. P. Marsh ◽  
M. E. Glicksman
Keyword(s):  
Grain Growth ◽  
Mean Field ◽  
Three Dimensional ◽  
Liquid Phase Sintering ◽  
Global Constraints ◽  
Material Interfaces ◽  
Wide Range ◽  
The Matrix ◽  
Field Approaches

AbstractTheories of late-stage phase separation are discussed from the perspective of statistical mean-field approaches, whereby the material interfaces are assumed to interact with the appropriate average microstructural environment. For coarsening of two- and three-dimensional phases, recent progress is presented for selecting the most appropriate averages that characterize the microstructural environment surrounding a domain. The effective mean field, as well as the average interaction distance over which transport occurs, may be determined self-consistently by imposing global constraints that reflect the microstructural phase fractions and by using explicit spatial and ensemble averages of the matrix transport fields. Comparison of new theoretical coarsening rates with liquid-phase sintering experiments show good agreement over a wide range of phase fractions. Extension of this approach to grain growth, which involves more complex topological interactions, is also discussed.

Three-Dimensional Simulation of Coarsening and Grain Growth in Sintering

2007 ◽  
Vol 539-543 ◽  
pp. 2359-2364 ◽  
Author(s):  
Fumihiro Wakai
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Boundary Energy ◽  
Three Dimensional ◽  
Grain Boundary Energy ◽  
Surface Evolver ◽  
Grain Boundary Mobility ◽  
Surface Mobility ◽  
Dimensional Simulation ◽  
Grain Boundary Motion

The interparticle mass transport causes the larger particles to grow at the expense of the smaller particles in the process of sintering. Coarsening during sintering results from surface motion, while grain growth results from grain boundary motion. The three-dimensional simulation was performed to study coarsening and grain growth during sintering by using the Surface Evolver program. The coarsening and grain growth were affected by the ratio of grain boundary energy to surface energy, the ratio of grain boundary mobility to surface mobility, the size of a particle, and its coordination number.

Annealing Textures of Thin Films and Copper Interconnects

2005 ◽  
Vol 475-479 ◽  
pp. 1-8 ◽  
Author(s):  
Dong Nyung Lee
Keyword(s):  
Thin Films ◽  
Grain Boundary ◽  
Grain Growth ◽  
Fiber Type ◽  
Boundary Energy ◽  
Boundary Surface ◽  
Strain Energy Release ◽  
Abnormal Grain Growth ◽  
Copper Interconnects ◽  
Geometric Constraints

Vapor-, electro-, and electroless-deposits have usually strong fiber textures. When annealed, the deposits undergo recrystallization or abnormal grain growth to reduce their energy stored during deposition. The driving force for recrystallization is mainly caused by dislocations, whereas that for abnormal grain growth is due to the grain boundary, surface, interface, and strain energies. During recrystallization and abnormal grain growth, the texture change can take place. The recrystallization and abnormal grain growth textures are in general of fiber type. However, copper interconnects are subjected to non-planar stress state due to geometric constraints during room temperature and/or elevated temperature annealing. The annealing textures of the thin films and copper interconnects are discussed in terms of the minimization of the surface, interface, and strain energies, the grain boundary energy and mobility, and the strain-energy-release maximization.

Abnormal Grain Growth and Texture Development

2005 ◽  
Vol 495-497 ◽  
pp. 1171-1176 ◽  
Author(s):  
Anthony D. Rollett
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Polycrystalline Materials ◽  
Second Phase ◽  
Goss Texture ◽  
Electrical Steels ◽  
Second Phase Particles ◽  
Euler Space ◽  
Boundary Properties

A theory for abnormal grain growth (AGG) in polycrystalline materials is revisited and extended in order to predict AGG in textured polycrystals. The motivation for the work is to improve our understanding of the origins of the Goss texture component, {110}<001>, during annealing of Fe-Si sheet. Since the AGG phenomenon in grain-oriented electrical steels is known to be dependent on the presence of a dispersion of fine second phase particles, the grain boundary properties are treated as representative of the homogenized behavior of the material, and not necessarily the properties that would be measured directly. The predictions of AGG are presented in the form of maps in Euler space, showing which texture components are most likely to grow abnormally. For different models of grain boundary properties applied to a theoretically derived texture, different sets of texture components are predicted to grow; neither model, however, predicts growth of the Goss component.

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