Terfenol: a study of the phase equilibrium diagram and the solidification process

dc.contributor.author Anderson, Mary
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-24T21:05:44.000
dc.date.accessioned 2020-06-30T08:17:13Z
dc.date.available 2020-06-30T08:17:13Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1993
dc.date.embargo 2013-11-20
dc.date.issued 1993
dc.description.abstract <p>Terfenol is a rare earth-iron alloy that was first developed at the Naval Ordinance Laboratory because of its rare magnetostrictive properties. Terfenol is composed of terbium and dysprosium combined with iron in a composition Tb{sub x}Dy{sub 1{minus}x}Fe{sub 2}, where x{approximately}0.3. The objective of this work was to determine the growth characteristics of Terfenol and its dependence on solidification rate, temperature gradient, and stoichiometry. Specific goals of this work were to verify the phase equilibria that is currently accepted for the systems DyFe{sub 2} and TbFe{sub 2}, and establish the phase equilibria near the composition Tb{sub 0.3}Dy{sub 0.7}Fe{sub 2}; establish that Terfenol grows directly from the liquid and that the reaction is occurring under metastable conditions; evaluate whether or not Terfenol can be grown under plane front conditions with a new radiofrequency float zone apparatus, and; determine whether or not <111> seeded crystals can be grown and <111> single crystals produced by elimination of dendrites employing growth methods capable of achieving high gradient/solidification rate ratios.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/214/
dc.identifier.articleid 1216
dc.identifier.contextkey 4840202
dc.identifier.doi https://doi.org/10.31274/rtd-180813-5567
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/214
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/73660
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/214/1993_AndersonMB_TerfenolStudyPhase.pdf|||Fri Jan 14 22:37:02 UTC 2022
dc.subject.disciplines Metallurgy
dc.subject.keywords Ames Laboratory
dc.subject.keywords Iron base alloys
dc.subject.keywords Phase studies
dc.subject.keywords Solidification
dc.subject.keywords Ternary allow systems
dc.subject.keywords Phase diagrams
dc.subject.keywords Terbium alloys
dc.subject.keywords Dysprosium alloys
dc.subject.keywords Magnetostriction
dc.subject.keywords Crystallization
dc.subject.keywords Differential thermal analysis
dc.title Terfenol: a study of the phase equilibrium diagram and the solidification process
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.level thesis
thesis.degree.name Master of Science
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