Abstract
This chapter discusses the role of key factors for templated grain growth (TGG). Template particles must possess a variety of properties for successful TGG. First, the single-crystal templates should have a suitable morphology with a high aspect ratio (e.g. >5) so that they can be mechanically aligned by shear during the green forming process, such as tape casting, extrusion, or uniaxial pressing. Thus, most templates used in TGG are platelets or whiskers. A fine grain, dense matrix is required because TGG is driven by the difference in surface free energies between the advancing crystal plane and the matrix grains during thermal processing. The effect of liquid phase in TGG is described. Liquid-phase sintering provides favorable kinetics and thermodynamic conditions for template growth. Anisometric templates are typically aligned by shear force during the green forming procedure. Thus, any type of forming process, which provides shear, can be used for TGG including tape casting, extrusion, injection molding, roll pressing, and uniaxial pressing.
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