Tantalum clustering in the A1 to L1o iron-platinum-tantalum chemical ordering phase transformation

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dc.contributor Mryasov, Oleg N.
dc.contributor Weaver, Mark Lovell
dc.contributor.advisor Thompson, Gregory B.
dc.contributor.author Means, Diondra
dc.date.accessioned 2017-02-28T22:25:06Z
dc.date.available 2017-02-28T22:25:06Z
dc.date.issued 2010
dc.identifier.other u0015_0000001_0000243
dc.identifier.other Means_alatus_0004M_10331
dc.identifier.uri https://ir.ua.edu/handle/123456789/749
dc.description Electronic Thesis or Dissertation
dc.description.abstract A series of Fe₅₂Pt₄₈, Fe₅₂․₃Pt₄₆․₃Ta₁․₄ and Fe₅₂Pt₄₀․₇Ta₇․₃ thin films were sputter- deposited and subsequently annealed at 550°C and 750°C for 30 min. The as-deposited films adopted the A1 phase. The addition of Ta resulted in the change in the {111} to {200} fiber texture for these films. This has been explained in terms of the competition between surface energy and strain energy. The Fe₅₂Pt₄₈ and Fe₅₂․₃Pt₄₆․₃Ta₁․₄ films ordered into L1₀ at 550°C but the Fe₅₂Pt₄₀․₇Ta₇․₃ did not. Upon annealing at 750°C all three films phase transformed to the L1₀ phase. As the Ta concentration increased, the grain size was refined and hindered grain growth. Atom probe tomography revealed nano-scale clustering upon annealing for films that contained Ta. For the lower 1.4 at.% Ta concentration film, these clusters were predominately within the grains. For the 7.3 at.% Ta film, the clusters formed predominately in the grain boundaries. The formation of clusters appears to be a necessary initial step to allow the short range A1 to L1₀ ordering processes in FePt to occur.
dc.format.extent 73 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Engineering, Materials Science
dc.subject.other Engineering, Metallurgy
dc.title Tantalum clustering in the A1 to L1o iron-platinum-tantalum chemical ordering phase transformation
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Metallurgical and Materials Engineering
etdms.degree.discipline Metallurgical/Materials Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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