Title: Morphology and growth kinetics of discontinuous coarsening in fully lamellar Ti44 Al (at.%) alloy
Abstract: The morphology of discontinuous coarsening in the Ti3Al(α2)TiAl(γ) fully lamellar Ti44 at.% Al alloy has been studied. Three types of morphology were observed in discontinuously coarsened lamellar structures (secondary lamellae). Type-(I) lamellae have the low energy habit plane as their lamellar interfaces, and have the same lamellar direction as the original primary lamellae. Type-(II) lamellae have the same crystallographic orientation of the α2 plates as that in the original primary lamellae, but have a different lamellar direction from the original primary lamellae, and have irregular faceted lamellar interfaces. Type-(III) lamellae have a different lamellar direction and a different crystallographic orientation of the α2 plates from that in the original primary lamellae, but have the low energy habit plane as their lamellar interfaces. The growth kinetics of these three types of lamellae are discussed by modifying the Livingston and Cahn treatment [11] in order to obtain the dependence of the secondary lamellar morphologies on misorientation between the penetrated primary lamellae, the advancing secondary lamellae and the lamellar colony boundaries.
Publication Year: 1997
Publication Date: 1997-11-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 50
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