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![Modeling Grain Boundary Anisotropy-Driven Microstructural Evolution wth Arbitrary Grain Orientation and Adaptive Mesh Refinement için kapak resmi Modeling Grain Boundary Anisotropy-Driven Microstructural Evolution wth Arbitrary Grain Orientation and Adaptive Mesh Refinement için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
Modeling Grain Boundary Anisotropy-Driven Microstructural Evolution wth Arbitrary Grain Orientation and Adaptive Mesh Refinement
Başlık:
Modeling Grain Boundary Anisotropy-Driven Microstructural Evolution wth Arbitrary Grain Orientation and Adaptive Mesh Refinement
Yazar:
Gras Ribot, Josep Maria, author.
ISBN:
9780355932317
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (50 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Brandon S. Runnels Committee members: Todd Bredbenner; Xin Cindy Wang.
Özet:
The development of new technology requires new materials with designed properties for high performance applications. This next generation of materials must be lighter, stronger and with the rest of their properties well characterized. Of particular interest for their wide range of applications are crystalline materials, in particular, metals. Recent efforts have been made to move towards nanodesigned materials, but in order to nanodesign materials their microscopic and mesoscopic properties have to be understood and well defined. Interfaces in crystalline materials are key players in a variety of mesoscopic and microscopic processes such as solidification, recrystallization, severe plastic deformation and grain boundary migration, stability and twinning. Of particular interest among all kind of interfaces are grain boundaries. Their simple geometry allows to generate a computational compact frameworks for their study.
The aim of this work is to increase the understanding of crystalline materials by computationally modeling the effect of anisotropic grain boundary energy on boundary formation, faceting, and migration. To examine the effect of strong energetic anisotropy, highly nonconvex energy functions are used. These energy functions exhibit strong cusps, both with and without continuous derivatives, to accurately replicate realistic boundary energy. This energy function without continuous derivatives is similar to that generated with the latest molecular dynamics simulations and other approaches, which are believed to be accurate in defining boundary energy. In this work, a simplified 2D interface between metals is considered. The boundary energy is coupled with Cahn-Hilliard kinetics in a phase field model with diffusive (finite width) boundaries. The developed phase field model can be easily coupled with other mechanical or thermal mechanisms, providing a framework that would allow the study of the coupling of grain boundaries with these phenomena. The present work is a major step towards developing the necessary computational framework to understand the behavior and the kinetics of grain boundaries.
Notlar:
School code: 0892
Konu Başlığı:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(693063.1) | 693063-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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