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Creep of Fully Lamellar Near γ-TiAl Intermetallics

Published online by Cambridge University Press:  10 February 2011

J. Beddoes ,
L. Zhao ,
W. R. Chen  and
X. Du
J. Beddoes
Affiliation:
Dept. of Mech. & Aero. Engineering, Carleton University, Ottawa, KIS 5B6, Canada
L. Zhao
Affiliation:
Structures, Materials & Propulsion Lab., Institute for Aerospace Research, National Research Council, Ottawa, KIA 0R6, Canada
W. R. Chen
Affiliation:
Dept. of Mech. & Aero. Engineering, Carleton University, Ottawa, KIS 5B6, Canada
X. Du
Affiliation:
Structures, Materials & Propulsion Lab., Institute for Aerospace Research, National Research Council, Ottawa, KIA 0R6, Canada
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Abstract

The influence of the fully lamellar morphology and third phase β on the creep properties of near γ-TiAl intermetallics is presented. Specifically, the effect of improved microstructural control obtainableby a stepped cool, involving furnace cooling and air cooling from the a single phase, on creep resistanceis demonstrated for three near γ-TiAl intermetallics: binary Ti-48AI, ternary Ti-48A1–2W and Ti-47A1–2Nb-IMn-0.5W-0.5Mo-0.2Si. The results indicate that appropriate stepped cooling can be used to reducethe lamellar interface spacing without the formation of Widmanstatten, feathery γ or γM structures, leadingto longer creep life and reduced creep strain rates. A second benefit of stepped cooling is preventionof βformation during cooling from the α phase, allowing controlled β precipitation during aging at 950 C. Creep tests on variously aged Ti-48A1–2W indicate that β precipitation along lamellar grain boundariesimproves creep resistance. Development of a uniform fully lamellar structure in Ti-47A1–2Nb-1Mn-0.5W-0.5Mo-0.2Si significantly improves creep resistance. Applying the stepped cool to this alloy allowsthe precipitation of β and silicides to be controlled during lower temperature aging.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK1.1.1
Copyright
Copyright © Materials Research Society 1999

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