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  • MATERIALS, METALLIC  (42)
  • 2020-2020
  • 1980-1984
  • 1970-1974  (42)
  • 1973  (42)
  • 1
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    Effect of diffusional creep on particle morphology of polycrystalline alloys strengthened by second phase particles (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Diffusional creep in a polycrystalline alloy containing second-phase particles can disrupt the particle morphology. For alloys which depend on the particle distribution for strength, changes in the particle morphology can affect the mechanical properties. Recent observations of diffusional creep in alloys containing soluble particles (gamma-prime strengthened Ni base alloys) and inert particles have been reexamined in light of the basic mechanisms of diffusional creep, and a generalized model of this effect is proposed. The model indicates that diffusional creep will generally result in particle-free regions in the vicinity of grain boundaries serving as net vacancy sources. The factors which control the changes in second-phase morphology have been identified, and methods of reducing the effects of diffusional creep are suggested.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TN-D-7177 , E-7248
    Format: application/pdf
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  • 2
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    Effects of high temperature brazing and thermal cycling on mechanical properties of Hastelloy X. (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data are presented on the effects of brazing alloy, brazing operation, thermal cycling, and combinations of these on the yield strength, elongation, ultimate tensile strength, and fatigue life of thin gage Hastelloy X. These data show that brazing with a Ni-Pd-Au alloy at 1461 K resulted in reductions of 35 percent in yield strength and elongation, 6 percent in ultimate tensile strength, and 18 percent in fatigue limit of Hastelloy X, as compared with as-received material. Subsequent exposure to 200 thermal cycles between 533 K and 1144 K after brazing caused further losses of 4 percent in yield strength, 8 percent in ultimate tensile strength, and 6 percent in fatigue limit.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TM-X-2704 , L-8561
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  • 3
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    A new criterion for failure of materials by environment-induced cracking (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A new criterion has been developed for predicting failure of materials by environment-induced cracking. The criterion has been developed by the use of fracture mechanics concepts and assumes that the relationship between crack-growth rate and stress intensity can be described by three separable regions of behavior as first suggested by Wiederhorn. The analytical form of the criterion relates failure time to the initial crack length and the critical crack length or alternatively, to the initial stress intensity and the fracture toughness for various conditions of stress and the environmental variables. The analytical expression is examined by the use of some experimental data on the hydrogen-induced cracking of Ti-5Al-2.5 Sn, and it is demonstrated that the expression predicts the general expected form of the relationship between the normalized stress intensity parameter and the failure time.
    Keywords: MATERIALS, METALLIC
    Type: International Journal of Fracture; 9; Mar. 197
    Format: text
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  • 4
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    Formation and breakdown of a protective layer of chromium sesquioxide on L-605 alloy at 1100 C (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: MATERIALS, METALLIC
    Type: Oxidation of Metals; 7; Aug. 197
    Format: text
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  • 5
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    Mechanical properties of electron-beam-melted molybdenum and dilute Mo-Re alloys. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Study of Mo-Re alloys aimed at examining the effects of small rhenium additions on the low-temperature ductility of molybdenum and determining the mechanical properties of dilute Mo-Re alloys. The results obtained indicate that high-purity Mo-Re alloys have ductile-brittle transition temperatures considerably lower than those for unalloyed molybdenum and that rhenium promotes normal solid-solution strengthening in molybdenum at elevated temperatures.
    Keywords: MATERIALS, METALLIC
    Type: Metallurgical Transactions; 4; Aug. 197
    Format: text
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  • 6
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    Diffusion in a unidirectional filament reinforced metal composite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A theoretical analysis has been developed to describe composition changes resulting from exposure of a unidirectional filament reinforced metal composite to an elevated temperature environment. The analysis was based on a simple superposition of finite-difference solutions of the diffusion equation, and was applicable to the case for which the filament and matrix metals comprised an isomorphous binary alloy system. The possibility of chemical reaction between filaments and matrix was excluded. Excellent agreement was obtained between calculated concentration profiles and results of quantitative electron microprobe analyses of nickel filament reinforced copper samples.
    Keywords: MATERIALS, METALLIC
    Type: Metallurgical Transactions; 4; Feb. 197
    Format: text
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  • 7
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    Determination of hydrogen permeation parameters in alpha titanium using the mass spectrometer. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: MATERIALS, METALLIC
    Type: Metallurgical Transactions; 4; Feb. 197
    Format: text
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  • 8
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    Diffusional creep and creep-degradation in dispersion-strengthened Ni-Cr base alloys. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Dispersoid-free regions were observed in the dispersion-strengthened alloy TD-NiCr (Ni-20 Cr-2 ThO2) after slow strain rate testing (stress rupture, creep, and fatigue) in air from 1145 to 1590 K. Formation of the dispersoid-free regions appears to be the result of diffusional creep. The net effect of creep in TD-NiCr is the degradation of the alloy to a duplex microstructure. Creep degradation of TD-NiCr is further enhanced by the formation of voids and intergranular oxidation in the dispersoid-free bands. Void formation was observed after as little as 0.13% creep deformation at 1255 K. The dispersoid-free regions apparently provide sites for void formation and oxide growth since the strength and oxidation resistance of Ni-20 Cr-2 ThO2.
    Keywords: MATERIALS, METALLIC
    Type: Metallurgical Transactions; 4; June 197
    Format: text
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  • 9
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    An observation of vacancy sources during substitutional diffusion in thoriated nickel alloys. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: MATERIALS, METALLIC
    Type: Metallurgical Transactions; 4; Mar. 197
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  • 10
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    The effect of elevated temperatures on the mechanical properties of B-Al composites. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: MATERIALS, METALLIC
    Type: Journal of Materials Science; 8; July 197
    Format: text
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