Direct Measurement of Anisotropy of Interfacial Free Energy From Grain Boundary Groove Morphology in Transparent Organic Metal Analog Systems.

Rustwick, B. A.

Technical Information Center Oak Ridge Tennessee

关键词: Anisotropy;    Grain boundaries;    Morphology;    Metals;    Nucleation;   

RP-ID  :  DE2006850083

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Both academia and industry alike have paid close attention to the mechanisms of microstructural selection during the solidification process. The forces that give rise to and the principles which rule the natural selection of particular morphologies are important to understanding and controlling new microstructures. Interfacial properties play a very crucial role to the selection of such microstructure formation. In the solidification of a metallic alloy, the solid-liquid interface is highly mobile and responds to very minute changes in the local conditions. At this interface, the driving force must be large enough to drive solute diffusion, maintain local curvature, and overcome the kinetic barrier to move the interface. Therefore, the anisotropy of interfacial free energy with respect to crystallographic orientation is has a significant influence on the solidification of metallic systems.