Accession Number : ADA288843

Title :   Lattice Parameters and Debye-Wailer Factors of gamma-TiAl Alloys.

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Menon, Sarath K. ; Fox, Alan G.

PDF Url : ADA288843

Report Date : DEC 1994

Pagination or Media Count : 16

Abstract : Accurate lattice parameters of the tetragonal gamma-TiAl phase with the L1 structure have been determined by X-ray diffraction. The results showed that in binary alloys, the A parameter decreases while the C parameter increases with increasing A1 content. Integrated X-ray intensity were determined from annealed powder samples with powder size < 5 microns in order to estimate the temperature factors Difficulties associated with such evaluations due to the effects of extinction are also discussed. In addition, the 110, 111, and 200 structure factor amplitudes of gamma phase Ti-56at. % Al alloy were accurately determined from critical-voltage electron diffraction measurements. The Debye-Waller factors determined from X-ray experiments and the critical voltage experiments are compared and the results discussed.

Descriptors :   *PHASE STUDIES, *TITANIUM ALUMINIDE, *BINARY ALLOYS, TEST AND EVALUATION, ANNEALING, EXPERIMENTAL DATA, HIGH TEMPERATURE, X RAY DIFFRACTION, INTENSITY, VOLTAGE, HIGH STRENGTH ALLOYS, ESTIMATES, BRITTLENESS, ALUMINUM, SAMPLING, LATTICE DYNAMICS, ATOMIC SPECTROSCOPY, ELECTRON DIFFRACTION, STOICHIOMETRY, TITANIUM ALLOYS, POWDER METALS.

Subject Categories : Properties of Metals and Alloys
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE