Excimer laser crystallization of quasicrystalline coatings on engineering substrates

dc.contributor.author Kumar, Arun
dc.date 2019-12-13T03:26:41.000
dc.date.accessioned 2020-06-30T08:12:36Z
dc.date.available 2020-06-30T08:12:36Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2006
dc.date.issued 2006-01-01
dc.description.abstract <p>Quasicrystals (QC) are materials with a unique combination of material properties including low friction, non-wetting behavior, high hardness and low thermal conductivity. However, very limited ductility and high temperature annealing requirements have limited its application. In this work, the laser crystallization of the amorphous quasicrystalline thin films deposited by magnetron sputtering on aluminum, steel, and titanium substrates was investigated using a 248-nm excimer laser. The effect of laser glazing on the crystallographic properties and the mechanical properties of the crystallized layers were studied along with laser annealing as a function of the laser fluence, pulse repetition rate and scan rate. The thermal phenomena associated with laser crystallization were identified using a 2-D ANSYS finite element model of numerically solving the governing heat flow equation. Further, X-ray diffraction, solidifications structure and ripple formation provided the evidence that the phase change from amorphous to crystalline involved the formation of liquid phase which also caused surface roughening.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/19040/
dc.identifier.articleid 20040
dc.identifier.contextkey 15986974
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/19040
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/73007
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/19040/SadhuKumar_ISU_2006_S23.pdf|||Fri Jan 14 21:51:52 UTC 2022
dc.subject.keywords Mechanical Engineering
dc.title Excimer laser crystallization of quasicrystalline coatings on engineering substrates
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
thesis.degree.discipline Mechanical Engineering
thesis.degree.level thesis
thesis.degree.name Master of Science
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