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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium The John Cahn Memorial Symposium
Presentation Title Thin Film Grain Growth for Twin Related Orientations of Grains
Author(s) John Blendell, Jean Taylor, John W Cahn, R. Edwin Garcia, Daniel J. Lewis
On-Site Speaker (Planned) John Blendell
Abstract Scope More than 20 years ago Thangaraj and Dahmen (1992) produced Al films on (111) Si that contained only 3 twin related orientations. All grain boundaries were 30˚<100> tilt boundaries. Both symmetric and asymmetric triple junctions were observed. Cahn and Kalonji (1994) determined that there was a possibility of 7 different triple junctions. Recently we simulated the 2D growth of grains driven by surface curvature in such a system containing only three orientations. The nature of the growth was different as compared to the random orientations case. It was observed that the kinetics of growth were strongly influence by the grain boundary Wulff shape. For an isotropic Wulff shape the classical N-6 rule was observed. However, for a square or octagonal Wulff shape, grains with a large number of sides were stabilized. This may be a consequence of the grain growth due to topological changes. For example, neighbor switching does not occur, rather the grains merge into a larger grain. Also, grains tend to have an elongated structure and do not tend towards being equiaxed but there does not appear to be a tendency towards exaggerated growth.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A DSC Model for Grain Boundary Migration and Properties
Beyond the Gorsky Effect – Exploring Larché-Cahn Open System Elasticity in Experiment
Dislocations, Trijunctions and Grain Rotation
Energetic Trends for Twin Boundaries in HCP Metals
Experimental Measures of Stress-coupled Boundary Migration and the Attendant Mechanical Behavior of Nanocrystalline Films
How Some Quasicrystals Might Grow
John Cahn's Boss, Really?
John Cahn and Aesthetics of Materials
Molecular Dynamics Simulations of Faceted, Incoherent Twin Boundaries
Phase Transition and Anomalous Diffusion in Metastable β Ti-Mo
Quasi-history of Quasi-crystallinity
Thin Film Grain Growth for Twin Related Orientations of Grains

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