An investigation of the interatomic bonding characteristics of a Ti - 51at.% Al alloy by X-ray diffraction. PDF
Preview An investigation of the interatomic bonding characteristics of a Ti - 51at.% Al alloy by X-ray diffraction.
NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS AN INVESTIGATION OF THE INTERATOMIC BONDING CHARACTERISTICS OF A Ti - 51at.% Al ALLOY BY X-RAY DIFFRACTION by Steven C. Cade June, 1991 Thesis Advisor: Alan G. Fox Approved for public release; distribution is unlimited. T25680^ SECURITYCLASSIFICATIONOFTHISPAGE REPORT DOCUMENTATION PAGE 1a REPORTSECURITYCLASSIFICATION 1b.RESTRICTIVEMARKINGS UNCLASSIFIED 2a SECURITYCLASSIFICATIONAUTHORITY 3 DISTRIBUTION/AVAILABILITYOFREPORT Approvedfor publicrelease;distributionisunlimited. 2b DECLASSIFICATION/DOWNGRADINGSCHEDULE 4 PERFORMINGORGANIZATIONREPORTNUMBER(S) 5 MONITORINGORGANIZATIONREPORTNUMBER(S) 6a NAMEOFPERFORMINGORGANIZATION 6b OFFICESYMBOL 7a NAMEOFMONITORINGORGANIZATION NavalPostgraduateSchool (Ifapplicable) NavalPostgraduateSchool ME 6c ADDRESS(City,State,andZIPCode) 7b ADDRESS(City,State,andZIPCode) Monterey,CA 93943 5000 Monterey,CA 93943-5000 8a.NAMEOFFUNDING/SPONSORING 8b OFFICESYMBOL 9 PROCUREMENTINSTRUMENTIDENTIFICATIONNUMBER ORGANIZATION (Ifapplicable) 8c ADDRESS(Dry,State,andZIPCode) 10 SOURCEOFFUNDINGNUMBERS ProgramElementNo ProtectNo laikNo WorkUnitAccession Number 11 TITLE (IncludeSecurityClassification) ANINVESTIGATIONOFTHEINTERATOMICBONDINGCHARACTERISTICSOFATi-51at.%AlALLOYBYX-RAYDIFFRACTION 12.PERSONALAUTHOR(S) Cade,StevenC. 13a.TYPEOFREPORT 13b TIMECOVERED 14 DATEOFREPORT(year,month,day) 15 PAGECOUNT Master'sThesis From To June 1991 71 16.SUPPLEMENTARYNOTATION TheviewsexpressedinthisthesisarethoseoftheauthoranddonotreflecttheofficialpolicyorpositionoftheDepartmentofDefenseortheU.S. Government. 17 COSATICODES 18.SUBJECTTERMS(continueonreverseifnecessaryandidentifybyblocknumber) FIELD GROUP SUBGROUP X-rayDiffraction,XRD,TiAl,titanium,aluminum,bondingcharacteristics,titanium aluminides,Debye-Wallertemperaturefactor,structurefactor 19 ABSTRACT(continueonreverseifnecessaryandidentifybyblocknumber) Thelatticeparametersandatomicstructurefactorsofanhomogenized,binary,Ti-51at.%Alintermetallicalloywereinvestigatedusing powderX-raydiffractionprocedures. Powdersampleswerepreparedbypulverizinginamortarandpestlelatheturningstakenfroma sampleingot. ThepowderwasthenannealedtorelievetheinducedstressandpassedthroughaU.S.Standard #400sievemesh(38microns). Latticeparametersoftheface-centeredtetragonalstructuredeterminedfromXRDpeakpositionsindicatedada ratioof1.020;valuesof 4.077Aand3.997Awereobtainedforc anda respectively. Theseresultsareinagreementwithpreviousresearchintov-phaseTiAl. MeasurementofdiffractedintensitieswasaccomplishedtodeterminetheDebye-WallertemperaturefactorwithavalueofB = 0.58A2 obtainedbytheWilsonMethod. Areductioninexpectedmeasuredintensitieswasnoted,particularlyatlowerBraggangles. Thiswas attributedtoextinctionbasedontheresultsofapowderparticlesizeaverageof24.3microns. Despitetheproblemsofextinction,the observedDebye-Wallerfactorwasjudgedtobereasonablyaccurateuponcomparisontocharacteristictemperatureandmeltingpointdata oftheTi-Alsystem. 20.DISTRIBUTION/AVAILABILITYOFABSTRACT 21 ABSTRACTSECURITYCLASSIFICATION E3 UNCLASSIFIED/UNIIMITED J SAMEASREPOR1 ] DTICUSERS Unclassified 22a NAMEOFRESPONSIBLE INDIVIDUAL 22b TELEPHONE(IncludeAreacode) 22c OFFICESYMBOL AlanG.Fox 408-646-2142 ME/Fx DD FORM 1473. 84 MAR 83APReditionmaybeuseduntilexhausted SECURITYCLASSIFICATIONOFTHISPAGE Allothereditionsareobsolete Unclassified Approved for public release; distribution is unlimited. An Investigation of the Interatomic Bonding Characteristics of a Ti - 51at.% Al Alloy by X-Ray Diffraction by Steven C. Cade Lieutenant, United States Navy B.S., United States Naval Academy, 1985 Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL
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