Cyclic oxidation behavior of a beta gamma powder metallurgy TiAl–4Nb–3Mn alloy coated with a NiCrAlY coating

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2011.12.004
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TypeArticle
Journal titleSurface and Coatings Technology
ISSN02578972
Volume206
Issue13
Pages30483054; # of pages: 7
SubjectTitanium aluminide; Beta gamma alloys; NiCrAlY; Plasma spray; Powder metallurgy; Cyclic oxidation
AbstractA new beta gamma TiAl–4Nb–3Mn alloy was synthesized by powder metallurgy (PM) and coated with NiCrAlY powder by Air Plasma Spray (APS). The cyclic oxidation behavior of the coated beta gamma alloy was investigated between room temperature and 1000 °C for up to 800 cycles. During cyclic oxidation testing, a TiN layer formed at the interface between NiCrAlY and TiAl–4Nb–3Mn and the thickness of the TiN layer increased with the number of cycles. The outward Ti diffusion also resulted in the formation of titanium oxides on the coating top surface after 630 cycles. Inward diffusion of Ni led to the formation of an inner diffusion zone containing NiAlTi and a mixture of NiAlTi + TiAl. Due to the spallation of coating scales on the circumferential surface, weight loss was observed after 120 cycles although both the top and bottom surfaces of the specimens remain in contact with the substrate until 800 cycles. Due to inward and outward diffusion, half of the NiCrAlY coating was consumed after 800 cycles suggesting the need for diffusion barrier coating at the interface between the NiCrAlY coating and the TiAl–4Nb–3Mn alloy.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Aerospace Research
Peer reviewedYes
IdentifierS0257897211011947
NPARC number21268729
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Record identifierdcf335d4-128b-46e2-b5fb-3fd2cb4ed981
Record created2013-11-08
Record modified2016-05-09
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