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  • 1
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    Microhardness and lattice parameter calibrations of the oxygen solid solutions of unalloyed α-titanium and Ti-6Al-2Sn-4Zr-2Mo (1987)
    Springer
    Details
    Publication Date: 1987-08-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 2
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    A method of rapidly obtaining concentration‐depth profiles from x‐ray diffraction (1985)
    American Institute of Physics
    Details
    Publication Date: 1985-08-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Oxidation characteristics of Ti-25Al-10Nb-3V-1Mo (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Static oxidation kinetics of the super-alpha 2 titanium-aluminide alloy Ti-25Al-10Nb-3V-1Mo (at. percent) were investigated in air over the temperature range of 650 to 1000 C using thermogravimetric analysis. The oxidation kinetics were complex at all exposure temperatures and displayed up to three distinct oxidation rates. Breakaway oxidation occurred after long exposure times at high temperatures. Oxidation products were determined using X-ray diffraction techniques, electron microprobe analysis, and energy dispersive X-ray analysis. Oxide scale morphology was examined by scanning electron microscopy of the surfaces and cross sections of oxidized specimens. The oxides during the parabolic stages were compact and multilayered, consisting primarily of TiO2 doped with Nb, a top layer of Al2O3, and a thin bottom layer of TiN. The transition between the second and third parabolic stage was found to be linked to the formation of a TiAl layer at the oxide-metal interface. Porosity was formed during the third stage, causing degradation of the oxide and the beginning of breakaway oxidation.
    Keywords: METALLIC MATERIALS
    Type: Oxidation of Metals (ISSN 0030-770X); 37; 3-4,; 111-124
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Thin coatings for protecting titanium aluminides in high-temperature oxidizing environments (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Titanium aluminides have high specific strengths at high temperatures but are susceptible to environmental attack. Their use in many aerospace applications would require that they be protected with coatings that, for structural efficiency, must be thin. It is conceivable that acceptable coatings might be found in several oxide systems, and consequently, oxide coatings of many compositions were prepared from sol-gels for study. Response-surface methodology was used to refine coating compositions and factorial experiments were used to develop coating strategies. Oxygen permeability diagrams of two-layer coatings for several oxide systems, an analysis of multiple-layer coatings on rough and polished surfaces, and modeling of the oxidation weight gain are presented.
    Keywords: METALLIC MATERIALS
    Type: In: Environmental effects on advanced materials (A93-13601 02-23); p. 107-121.
    Format: text
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  • 5
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    Oxidation characteristics of Ti-33Al-6Nb-1.4Ta (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Static oxidation kinetics of the gamma titanium-aluminide alloy Ti-33Al-6Nb-1.4Ta (wt pct) have been investigated in air from 700 to 1000 C and in oxygen from 800 to 1000 C using thermogravimetric analysis. The oxidation kinetics were controlled by the presence of alumina for all oxygen exposures and in air below 800 C, while the kinetics in air above 800 C were more complex. Oxidation products were identified using X-ray diffraction techniques. Oxide scale morphology was examined by SEM and TEM of the surfaces and across sections of oxidized specimens. The oxidation products formed depended on the exposure: Al2O3 and TiO2 were identified on all specimens exposed in and air and oxygen; the nitride phases TiN and Ti2AlN were also found on specimens exposed in air.
    Keywords: METALLIC MATERIALS
    Type: In: Environmental effects on advanced materials (A93-13601 02-23); p. 79-89.
    Format: text
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  • 6
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    Microhardness and lattice parameter calibrations of the oxygen solid solutions of unalloyed alpha-titanium and Ti-6Al-2Sn-4Zr-2Mo (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Standards were prepared for calibrating microanalyses of dissolved oxygen in unalloyed alpha-Ti and Ti-6Al-2Sn-4Zr-2Mo. Foils of both of these materials were homogenized for 120 hours in vacuum at 871 C following short exposures to the ambient atmosphere at 854 C that had partially oxidized the foils. The variation of Knoop microhardness with oxygen content was calibrated for both materials using 15-g and 5-g indentor loads. The unit-cell lattice parameters were calibrated for the unalloyed alpha-Ti. Example analyses demonstrate the usefulness of these calibrations and support an explanation of an anomaly in the lattice parameter variation. The results of the calibrations have been tabulated and summarized using predictive equations.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science (ISSN 0360-2133); 18A; 1503-151
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Use of aluminum as an oxidation barrier for titanium (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A study is conducted of the use of aluminum coatings as oxidation retardants for Ti alloys, using room temperature normal emittance and spectral emittance as bases for the characterization of oxidation properties with and without the coatings. Thermal exposures were conducted in a thermogravimetric analysis apparatus in which specimen weight was continuously monitored. The results obtained indicate that the weight gains are proportional to the square root of the time for uncoated alloys and for 649 C-exposed aluminum-coated alloys. For the 704 C-exposed aluminum-coated alloys, weight gain exhibits a low rate for short and a high rate for long exposure times, implying that the 0.5-micron coating's protection decreases for long exposures at this temperature.
    Keywords: METALLIC MATERIALS
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  • 8
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    A method of rapidly obtaining concentration-depth profiles from X-ray diffraction (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A broadened diffraction peak, or intensity band, is observed in the case diffraction from a nonhomogeneous phase in which the variations in compositions result in a range of lattice spacings. An intriguing aspect regarding the relationship between the X-ray diffraction band and the composition-depth profile is the hypersensitivity of the intensity band to the shape of the profile. A number of investigators have sought to use this sensitivity to construct high-precision profiles. Difficulties encountered are related to complications due to intensity broadening, and prohibitive computational requirements. Simulation techniques have provided the most accurate interpretation of the intensity band. However, the involved calculations have been prohibitively long. The present study discusses a technique which has simple computational requirements and is as accurate and flexible as the simulation techniques.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Physics (ISSN 0021-8979); 58; 1095-110
    Format: text
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  • 9
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    Effect of oxygen barrier coatings on oxidation and embrittlement of Ti-6Al-2Sn-4Zr-2Mo foil in heat shield applications (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Because of the loss of ductility with exposure to oxidizing conditions, long time applications of titanium alloys have been limited to temperatures below 700 K and short time applications have been limited to temperatures below 815 K. Oxygen barrier coatings for shielding Ti-6Al-2Sn-4Zr-2Mo alloy from oxidation during exposure to high temperatures were studied using foil gage specimens. The coatings included micrometer-thick sputtered SiO2 and chemical-vapor-deposited silicate layers both with and without an aluminum basecoat. The oxidation rates and resistance to embrittlement of the coated specimens were significantly better than those of the uncoated specimens.
    Keywords: METALLIC MATERIALS
    Type: AIAA PAPER 86-0889
    Format: text
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  • 10
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    A simple method of obtaining concentration depth-profiles from X-ray diffraction (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The construction of composition profiles from X-ray intensity bands was investigated. The intensity band-to-composition profile transformation utilizes a solution which can be easily evaluated. The technique can be applied to thin films and thick speciments for which the variation of lattice parameters, linear absorption coefficient, and reflectivity with composition are known. A deconvolution scheme with corrections for the instrumental broadening and ak-alfadoublet is discussed.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-176262 , NAS 1.26:176262 , TMS-PAPER-F8415
    Format: application/pdf
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