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dc.contributor.advisor Barrera, Enrique V.
dc.creatorChen, Jinmin
dc.date.accessioned 2009-06-04T06:29:47Z
dc.date.available 2009-06-04T06:29:47Z
dc.date.issued 1997
dc.identifier.urihttps://hdl.handle.net/1911/17070
dc.description.abstract In an effort to expand the composition range over which Al$\sb3$Ti is stable, various amounts of niobium were substituted for titanium and processed by melt-spinning. In order to characterize $\rm Al\sb3Ti\sb{x}Nb\sb{y},$ where x + y = 1 and y = 0.0, 0.1, 0.2, and 0.4 intermetallics, XRD and EXAFS were employed. Several samples were annealed both at 600$\sp\circ$C and 1000$\sp\circ$C. XRD showed that for all the samples the only structure present was the tetragonal DO$\sb{22}$ structure. The DO$\sb{22}$ structure was stable even after high temperatures heat treatments. Niobium atoms were observed to occupy titanium sites in DO$\sb{22}$ by EXAFS. Furthermore, in the unannealed samples, increasing wheel speed of the melt spinning process or the niobium concentration tended to distort the crystal structure. It was observed that Ti EXAFS had different results from the Nb EXAFS beyond their occupying similar sites. The samples were found to experience an order-disorder-order process with change of the annealing temperatures.
dc.format.extent 76 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectCondensed matter physics
Engineering
Materials science
dc.title A structural analysis of Al(3)Ti and Al(3)Ti-Nb titanium trialuminides by XRD and EXAFS
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Physics
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Science
dc.identifier.citation Chen, Jinmin. "A structural analysis of Al(3)Ti and Al(3)Ti-Nb titanium trialuminides by XRD and EXAFS." (1997) Master’s Thesis, Rice University. https://hdl.handle.net/1911/17070.


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