Show simple item record

dc.contributor.advisorFox, Alan G.
dc.contributor.authorStoner, Troy A.
dc.dateMarch 1992
dc.date.accessioned2013-01-23T22:10:27Z
dc.date.available2013-01-23T22:10:27Z
dc.date.issued1992-03
dc.identifier.urihttp://hdl.handle.net/10945/27221
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractThe lattice parameters, structure factors, and Debye-Waller temperature factor of a homogenized, binary Ti-51at.%Al intermetallic alloy were determined using powder X-ray diffraction (XRD). Previous studies have been hampered by extinction at low Bragg angles, therefore improved powdering methods were implemented. The powder was produced by pulverizing lathe turnings taken from the sample ingot using a ceramic mortar and pestle. then the powder was passed through a U.S. Standard 400 sieve mesh (38 microns). After further grinding a new acoustical sieving procedure was performed where powder particles were passed through a 2000 line per inch sieve mesh (5-7 microns). Next the powder was annealed to relieve induced stress produced during grinding. An X-ray diffraction study was conducted for Bragg angles 10-140 deg. The L1 structured TiAl lattice parameters of a =4.002 and c=4.081 were determined using XRD peak positions. the resulting c/a ratio equalled 1.02. The measured integrated intensities of the fundamental reflections were used to determine a Debye-Waller temperature factor of B=0.65 using the Wilson method. these values were determined to be accurate based on comparison to previous research and theoretical approximations. The effects of extinction at low angles were not completely avoided with the refined powder particle size however, they were significantly reduced.en_US
dc.description.urihttp://archive.org/details/preparationofext00ston
dc.format.extent66 p.: ill.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.subject.lcshMechanical engineeringen_US
dc.titlePreparation of Extinction Free Gamma Ti-51at.%Al Alloy Powder and Characterization by X-ray Diffractionen_US
dc.typeThesisen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentMechanical Engineering
dc.subject.authorX-ray diffractionen_US
dc.subject.authorXRDen_US
dc.subject.authorTiAlen_US
dc.subject.authorTitaniumen_US
dc.subject.authorAluminumen_US
dc.subject.authorBonding characteristicsen_US
dc.subject.authorTitanium aluminidesen_US
dc.subject.authorDebye-Waller temperature factoren_US
dc.subject.authorStructure factoren_US
dc.subject.authorLattice parameteren_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. in Mechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record