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Creep of Fully Lamellar Near γ-TiAl Intermetallics

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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-48Al, ternary Ti-48Al-2W and Ti-47Al-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-48Al-2W indicate that β precipitation along lamellar grain boundariesimproves creep resistance. Development of a uniform fully lamellar structure in Ti-47Al-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.

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Authors and Affiliations

  1. Dept. of Mech. & Aero. Engineering, Carleton University, Ottawa, KIS 5B6, Canada

    J. Beddoes & W. R. Chen

  2. Structures, Materials & Propulsion Lab., Institute for Aerospace Research, National Research Council, Ottawa, KIA 0R6, Canada

    L. Zhao & X. Du

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  1. J. Beddoes
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  2. L. Zhao
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  3. W. R. Chen
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  4. X. Du
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Beddoes, J., Zhao, L., Chen, W.R. et al. Creep of Fully Lamellar Near γ-TiAl Intermetallics. MRS Online Proceedings Library 552, 111 (1998). https://doi.org/10.1557/PROC-552-KK1.1.1

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