THE MICROSTRUCTURAL RESPONSE OF NEAR GAMMA-TiAl+W TO HEAT TREATMENT

Authors
  1. Beddoes, J.C.
  2. Zhao, L.
  3. Wallace, W.
Corporate Authors
Carleton Univ, Ottawa ONT (CAN) Dept of Mechanical and Aeronautical Engineering;Chief of Research and Development, Ottawa ONT (CAN) Director Research and Development Air;Institute for Aerospace Research, Ottawa ONT (CAN)
Abstract
The microstructure and mechanical properties of near gamma-TiAl alloys can be altered substantially by appropriate heat treatment. A duplex fine grained microstructure of gamma-TiAl + alpha sub 2-Ti3Al produced by heat treatment in the alpah+gamma regions of the phase diagram is beneficial for low temperature strength and ductility. Heat treatment in the single phase alpha region results in a coarser grained fully transformed microstructure of gamma and alpha sub 2 lamellae, giving improved fracture toughness and creep resistance. However, it is notclear if the improved toughness and creep resistance are due to the fully transformed microstructure or grain size influences. This uncertainty exists because the kinetics of grain growth in the single phase alpha region are rapid, making it difficult to produce a fine grained fully transformed microstructure. TRUNCATED
Date of publication
01 Jan 1993
Number of Pages
5
DSTKIM No
93-00237
CANDIS No
127464
Format(s):
Hardcopy;Originator's fiche received by DSIS

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