Isothermal oxidation behavior of powder metallurgy beta gamma TiAl-2Nb-2Mo alloy

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DOIResolve DOI: http://doi.org/10.1016/j.intermet.2011.05.027
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TypeArticle
Journal titleIntermetallics
ISSN0966-9795
Volume19
Issue10
Pages15091516; # of pages: 8
SubjectAero-engine components; B. Oxidation; C. Powder metallurgy; D. Microstructure; Titanium aluminides; Alloys; Aluminum; Cerium alloys; Molybdenum; Niobium; Oxidation; Powder metallurgy; Reaction intermediates; Titanium; Titanium alloys; Titanium compounds; Titanium dioxide; Tungsten; Molybdenum alloys
AbstractA new TiAl-2Nb-2Mo beta gamma alloy was synthesized by powder metallurgy process. HIP'ed and vacuum heat treated specimens were isothermally oxidized at 800 °C and 900 °C in air up to 500 h. The TiAl-2Nb-2Mo alloy oxidized parabolically up to 500 h at both 800 °C and 900 °C. The oxides consisted of outer TiO2 layer, intermediate Al2O 3 layer, and inner TiO2 rich mixed layer and the oxidation mechanisms of the alloy were identical at both temperatures. During oxidation, the degradation of lamellar colonies formed a diffusion zone just below the oxide/substrate interface consisting of γ-TiAl matrix and dispersed beta phases which contained high concentration of Nb and Mo. The oxidation rate of the TiAl-2Nb-2Mo alloy is more sensitive to temperature than those of the Ti-48Al-2Nb-2Cr and Ti-48Al-2Nb-2Cr-W alloys. © 2011 Elsevier Ltd. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271589
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Record identifier31767dd9-1474-43fe-8601-8359d334609d
Record created2014-03-24
Record modified2016-05-09
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