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Microstructure of Extremely Fine Lamellae in a TiAl Base Alloy Studied by High-resolution Electron Microscopy

Published online by Cambridge University Press:  15 February 2011

E. Abe ,
T. Kumagai  and
M. Nakamura
E. Abe
Affiliation:
National Research Institute for Metals, Tsukuba-shi, Ibaraki 305, Japan
T. Kumagai
Affiliation:
National Research Institute for Metals, Tsukuba-shi, Ibaraki 305, Japan
M. Nakamura
Affiliation:
National Research Institute for Metals, Tsukuba-shi, Ibaraki 305, Japan
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Abstract

An extremely fine lamellar structure formed in a Ti-48at.%Al alloy, which was heat treated in the high-temperature α-Ti (disordered hcp) single phase field (1683K), followed by ice water quenching, has been examined by high-resolution and analytical transmission electron microscopy. The microstracture consists of thin plates of ordered α2-Ti3Al (D019: ordered version of hcp) and γ-TiAl (Ll0: ordered version of fcc) phases, and interfaces of lamellae are atomically flat in a wide range. From detailed analyses of the microstructure and composition in nm scale, the α→γ phase transformation, which occurs during quenching and produces the extremely fine α2-γ lamellae, has been discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 281
Copyright
Copyright © Materials Research Society 1996

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