The effect of microstructure on creep behavior of a powder metallurgy (PM) beta gamma alloy

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DOIResolve DOI: http://doi.org/10.1007/s12206-012-0504-6
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TypeArticle
Journal titleJournal of Mechanical Science and Technology
ISSN1738-494X
1976-3824
Volume26
Issue7
Pages20092013; # of pages: 5
Subjectbeta gamma TiAl alloy; beta phase; creep; powder metallurgy
AbstractPre-alloyed beta gamma titanium aluminide powder with a nominal composition of TiAl-2Nb-2Mo (G2) is consolidated by hot isostatic pressing. After consolidation, a step cooled heat treatment is performed to homogenize the material and produce a fully lamellar microstructure. Various aging heat treatments are then performed to form interfacial beta phase precipitates along lamellar interfaces. The step cooled heat treatment produces a relatively fine microstructure with an average lamellar grain size of 40 μm. The aging heat treatments generate beta phase precipitates along lamellar grain boundaries as well as along lamellar interfaces, and result in limited lamellar degradation and grain growth. However, coarse intergranular grains consisting of beta and gamma grains form during aging. Constant load tensile creep tests are performed on step cooled heat treated and aged specimens. Primary creep resistance, generally, improves with aging time, even with interfacial precipitation, and the limited lamellar degradation occurs with aging. However, total creep life of aged samples decreases with aging time. The microstructures of the tested specimens are characterized and related to the creep behaviour of the TiAl-2Nb-2Mo alloy in the un-aged and aged conditions.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
Identifier504
NPARC number21268439
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Record identifierfe1b5979-9140-4623-bca3-69e6ac73a58e
Record created2013-07-15
Record modified2016-05-09
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