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Influence of Processing Variables on the Morphology and Microstructure of a Non-Stoichiometric Complex Concentrated Alloy

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dc.contributorKasemer, Matthew
dc.contributorLi, Lin
dc.contributor.advisorWeaver, Mark L.
dc.contributor.authorMitchell, Aidan Matthew
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2022-09-28T14:54:47Z
dc.date.available2022-09-28T14:54:47Z
dc.date.issued2022
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractThe development of high-entropy alloys has been a major area of research in recent years.The compositionally complex alloy Al_1_0Co_2_5Cr_8Fe_1_5Ni_3_6Ti_6 has been promoted as an optimizedchemistry exhibiting medium hardness with good ductility and high tensile strength. This thesisaims to provide insight into the growth of Al_1_0Co_2_5Cr_8Fe_1_5Ni_3_6Ti_6 as a surface coating and into theinfluence of coating morphology on its interdiffusion behavior. Coatings were deposited via highrate unbalanced direct current magnetron sputtering. Deposition conditions were selected tosurvey processing-property relations relative to the structure zone model for thick film growthproposed by Thornton. Thick micro-scale coatings were deposited onto CMSX-8 Ni-based superalloy substrates at various temperatures and Ar gas pressures and later annealed to observe diffusion behavior. Coating morphology, chemical analysis, and crystallographic identification were performed using scanning electron microscopy, energy-dispersive x-ray spectroscopy, and x-ray diffraction. Coatings produced at 5 mTorr Ar pressure displayed dense Zone T or mixed Zone T + Zone 2 morphologies and the least amount of diffusion into the substrate upon annealing. Some of the samples at high pressures and temperatures possessed porous, fibrous Zone 2 morphologies caused by a high incident angle between the substrate and sputter gun.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otherhttp://purl.lib.ua.edu/186474
dc.identifier.otheru0015_0000001_0004433
dc.identifier.otherMitchell_alatus_0004M_14927
dc.identifier.urihttps://ir.ua.edu/handle/123456789/9460
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.subjectcoating
dc.subjecthigh entropy alloy
dc.subjectmagnetron
dc.subjectMorphology
dc.subjectSputtering
dc.titleInfluence of Processing Variables on the Morphology and Microstructure of a Non-Stoichiometric Complex Concentrated Alloyen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Metallurgical and Materials Engineering
etdms.degree.disciplineEngineering
etdms.degree.grantorThe University of Alabama
etdms.degree.levelmaster's
etdms.degree.nameM.S.

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