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  • METALLIC MATERIALS  (9)
  • Adult  (1)
  • 1980-1984  (10)
  • 1955-1959
  • 1940-1944
  • 1
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    Essential hypertension: central and peripheral norepinephrine (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-02-27
    Description: The concentration of norepinephrine in cerebrospinal fluid from patients with essential hypertension is higher than that from healthy normal volunteers, but the concentrations of norepinephrine in plasma from these groups are similar. This finding indicates that central nervous system noradrenergic hyperactivity occurs in essential hypertension but apparently is not reflected in abnormal function of the peripheral sympathetic nervous system in these patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lake, C R -- Gullner, H G -- Polinsky, R J -- Ebert, M H -- Ziegler, M G -- Bartter, F C -- New York, N.Y. -- Science. 1981 Feb 27;211(4485):955-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7466370" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Blood Pressure ; Female ; Humans ; Hypertension/blood/*cerebrospinal fluid ; Middle Aged ; Norepinephrine/blood/*cerebrospinal fluid ; Posture
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    The influence of cobalt on the tensile and stress-rupture properties of the nickel-base superalloy MAR-M247 (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 13A; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Influence of cobalt, tantalum, and tungsten on the microstructure and mechanical properties of superalloy single crystals (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The influence of Co, Ta, and W on the microstructure and mechanical properties of nickel base super-alloy single crystals was investigated. A matrix of alloys was based on Mar-M 247 stripped of C, B, Zr, and Hf. The microstructures of the alloys were examined using optical and electron microscopy, phase extraction, X-ray diffraction, and differential thermal analysis. Tensile and creep-rupture tests were performed at 1000 C. An increase in tensile and creep strength resulted when Co was removed from alloys containing high refractory metal contents, but Co effects were negligible for alloys with lower refractory metal levels. In the composition range studied, W was more effective than Ta in increasing the creep resistance. The mechanical properties are discussed in relation to the microstructures of the alloys.
    Keywords: METALLIC MATERIALS
    Type: COSAM (Conserv. Of Strategic Aerospace Mater.) Program Overview; p 107-116
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The development of directional coarsening of the gamma-prime precipitate in superalloy single crystals (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A study has been made of the kinetics of the directional coarsening of the gamma-prime precipitates in Ni-5.8Al-14.6Mo-6.2Ta single crystals during creep at 982 C. In this alloy, which is characterized by a large negative lattice misfit between the gamma-prime precipitate and the gamma matrix, the formation of gamma-prime rafts begins during primary creep, and the rafts grow in length as the deformation proceeds into steady-state creep. After that, the length of the rafts stabilizes. The thickness of the rafts remains constant from primary up to tertiary creep. The directional coarsening behavior of the alloy studied is similar to that of a more conventional single-crystal superalloy having a substantially smaller negative misfit.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica (ISSN 0036-9748); 17; 1217-122
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The influence of cobalt on the microstructure of the nickel-base superalloy MAR-M247 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Nickel was substituted for Co to produce 0, 5, and the standard 10% versions of MAR-M247, a cast nickel-base superalloy. The microstructures of the alloys were examined in as-cast, heat treated, aged, and stress-rupture tested conditions using a variety of metallographic techniques and differential thermal analysis. As cobalt concentration was reduced from 10 to 0 wt %, the gamma-prime weight fraction decreased from 59 to 41%; W and Ti concentrations in the gamma-prime phase increased from 5 to 8 and 2 to 3 at.%, respectively; the mean gamma-prime particle size increased from 0.6 to 0.8 micron; Cr and Al concentrations in the gamma matrix decreased from 17 to 13 and 15 to 12 at.%, respectively; and the weight fraction of carbides increased by approximately 1%.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 13A; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Factors which influence directional coarsening of gamma-prime during creep in nickel-base superalloy single crystals (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Changes in the morphology of the gamma prime precipitate were examined as a function of the time during creep at 982 C in 001 oriented single crystals of a Ni-Al-Mo-Ta superalloy. In this alloy, which has a large negative misfit of -0.80 pct., the gamma prime particles link together during creep to form platelets, or rafts, which are aligned with their broad faces perpendicular to the applied tensile axis. The effects of initial microstructure and alloy composition of raft development and creep properties were investigated. Directional coarsening of gamma prime begins during primary creep and continues well after the onset of second state creep. The thickness of the rafts remains constant up through the onset of tertiary creep, a clear indication of the stability of the finely-spaced gamma/gamma prime lamellar structure. The thickness of the rafts which formed was equal to the initial gamma prime size which was present prior to testing. The single crystals with the finest gamma prime size exhibited the longest creep lives, because the resultant rafted structure had a larger number of gamma/gamma prime interfaces per unit volume of material. Reducing the Mo content by only 0.73 wt. pct. increased the creep life by a factor of three, because the precipitation of a third phase was eliminated.
    Keywords: METALLIC MATERIALS
    Type: Superalloys 1984; Oct 07, 1984 - Oct 11, 1984; Champion, PA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Influence of composition on the microstructure and mechanical properties of a nickel-base superalloy single crystal (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The effects of cobalt, tantaium, and tungsten contents on the microstructure and mechanical properties of single crystal Mar-M247 were investigated. Elevated temperature tensile and creep-rupture properties of 001 oriented single crystals were related to microstructural features of the alloys. Substitution of Ni for Co in the high refractory metal alloys increased the lattice mismatch, which was considered to be the cause of the increases in tensile and creep strength. Substitution of Ni for Ta caused large decreases in tensile strength and creep life, consistent with decreases in gamma prime volume fraction, lattice mismatch, and solid solution hardening. Substitution of W for Ta resulted in decreased life at high stresses, which was related to small decreases in mismatch and volume fraction. However, the W substitution resulted in improved life at low stresses, which was related to solid solution strengthening by W.
    Keywords: METALLIC MATERIALS
    Type: Superalloys 1984; Oct 07, 1984 - Oct 11, 1984; Champion, PA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Influence of composition on the microstructure and mechanical properties of a nickel-base superalloy single crystal (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of cobalt, tantalum, and tungsten contents on the microstructure and mechanical properties of single crystal Mar-M247 were investigated. Elevated temperature tensile and creep-rupture properties of 001 oriented single crystals were related to microstructural features of the alloys. Substitution of Ni for Co in the high refractory metal alloys increased the lattice mismatch, which was considered to be the cause of the increases in tensile and creep strength. Substitution of Ni for Ta caused large decreases in tensile strength and creep life, consistent with decreases in gamma prime volume fraction, lattice mismatch, and solid solution hardening. Substitution of W for Ta resulted in decreased life at high stresses, which was related to small decreases in mismatch and volume fraction. However, the W substitution resulted in improved life at low stresses, which was related to solid solution strengthening by W.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-83563 , E-1942 , NAS 1.15:83563 , Intern. Symp. on Superalloys; Oct 07, 1984 - Oct 11, 1984; Seven Springs, PA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Changes in the morphology of the gamma prime precipitate were examined as a function of time during creep at 982 C in 001 oriented single crystals of a Ni-Al-Mo-Ta superalloy. In this alloy, which has a large negative misfit of -0.80 pct., the gamma prime particles link together during creep to form platelets, or rafts, which are aligned with their broad faces perpendicular to the applied tensile axis. The effects of initial microstructure and alloy composition of raft development and creep properties were investigated. Directional coarsening of gamma prime begins during primary creep and continues well after the onset of second state creep. The thickness of the rafts remains constant up through the onset of tertiary creep a clear indication of the stability of the finely-spaced gamma/gamma prime lamellar structure. The thickness of the rafts which formed was equal to the initial gamma prime size which was present prior to testing. The single crystals with the finest gamma prime size exhibited the longest creep lives, because the resultant rafted structure had a larger number of gamma/gamma prime interfaces per unit volume of material. Reducing the Mo content by only 0.73 wt. pct. increased the creep life by a factor of three, because the precipitation of a third phase was eliminated.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-83595 , E-1997 , NAS 1.15:83595 , Intern. Symp. on Superalloys; Oct 07, 1984 - Oct 11, 1984; Seven Springs, PA; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Gamma prime shape changes during creep of a nickel-base superalloy (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Changes in the shape of the gamma-prime phase in the single-crystal nickel base alloy NASAIR 100 during tensile and compressive creep have been investigated experimentally by Laue X-ray diffractometry. It is found that under tensile loading, gamma-prime changes from the initial cubic shape to plates perpendicular to the applied stress. This change occurs during primary creep at 1000 C, 148 MPa. Prolonged creep exposures result in a thickening of the gamma-prime plates that is similar to Ostwald ripening often observed in other superalloys during creep. Under compressive loading, two sets of gamma-prime plates parallel to the applied stress are formed.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica (ISSN 0036-9748); 17; Sept
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