Precipitation of α Phase in the Massive and Feathery Structures in TiAl Alloys during Aging in the Single α Field

Abstract

Abstract: Precipitation of α-phase in massive and feathery microstructures was studied during aging in the single α field. It was found that the α-phase mainly precipitated along the γ-plate interfaces as laths in the feathery structure, while it nucleated at various sites in the massive structure in the form of particles and dominantly as plates. Precipitation of α-plates in the massive structure occurred by the diffusional ledge mechanism. The γm→α reaction proceeded by the growth of previously nucleated α-precipitates, and chiefly by the development of new α-plates.

Key words:

Weijun ZHANG, Guoliang CHEN. Precipitation of α Phase in the Massive and Feathery Structures in TiAl Alloys during Aging in the Single α Field[J]. J Mater Sci Technol, 1999, 15(05): 469-472.

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Precipitation of α Phase in the Massive and Feathery Structures in TiAl Alloys during Aging in the Single α Field

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