Microstructures and oxidation behavior of sputter-deposited overlay coatings based on â-NiAl

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dc.contributorThompson, Gregory B.
dc.contributorWang, Jialai
dc.contributor.advisorWeaver, Mark Lovell
dc.contributor.authorAlfano, Joel
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2017-03-01T14:46:33Z
dc.date.available2017-03-01T14:46:33Z
dc.date.issued2011
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractNickel-based superalloy components in the hot sections of commercial gas turbine engines are often protected by aluminide coatings due to their ability to function in oxidative and corrosive environments. However, the microstructures of these coated systems are metastable and change in service due to interactions with the environment and interdiffusion with the underlying substrate. The extent of these changes depends critically upon coating microstructure, chemistry, and the environment that the coated component operates in. This thesis highlights the influences of chemical composition, post-deposition annealing, and isothermal oxidation at 1050°C on the microstructures and properties of NiAl-Zr and NiAl-Cr-Zr overlay bond coatings. In particular, the results indicated that in slightly Ni-rich NiAl-based coatings, coating/substrate interdiffusion and Al-depletion within the coating could be inhibited by increasing the Zr content from 0.3 at.% to 1.0 at.% Zr. However, subsequent additions of 5 at.% Cr to coatings containing 1 at.% Zr, resulted in interdiffusion and Al-depletion levels more similar to low Zr or Zr-free coatings. Results are discussed relative to conventional coating systems.en_US
dc.format.extent75 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0000699
dc.identifier.otherAlfano_alatus_0004M_10822
dc.identifier.urihttps://ir.ua.edu/handle/123456789/1204
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectMaterials science
dc.titleMicrostructures and oxidation behavior of sputter-deposited overlay coatings based on â-NiAlen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Metallurgical and Materials Engineering
etdms.degree.disciplineMetallurgical/Materials Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.levelmaster's
etdms.degree.nameM.S.

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