A structural analysis of Al(3)Ti and Al(3)Ti-Nb titanium trialuminides by XRD and EXAFS

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dc.contributor.advisorBarrera, Enrique V.en_US
dc.creatorChen, Jinminen_US
dc.date.accessioned2009-06-04T06:29:47Zen_US
dc.date.available2009-06-04T06:29:47Zen_US
dc.date.issued1997en_US
dc.description.abstractIn 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.en_US
dc.format.extent76 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS M.E. 1997 CHENen_US
dc.identifier.citationChen, 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. <a href="https://hdl.handle.net/1911/17070">https://hdl.handle.net/1911/17070</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/17070en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectCondensed matter physicsen_US
dc.subjectEngineeringen_US
dc.subjectMaterials scienceen_US
dc.titleA structural analysis of Al(3)Ti and Al(3)Ti-Nb titanium trialuminides by XRD and EXAFSen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentMechanical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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