The Resource Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals, Rebecca A. MacKay and Lynn J. Ebert, (microform)

Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals, Rebecca A. MacKay and Lynn J. Ebert, (microform)

Label
Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals
Title
Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals
Statement of responsibility
Rebecca A. MacKay and Lynn J. Ebert
Creator
Contributor
Subject
Genre
Language
eng
Summary
"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."--NASA Technical Reports Server web site
Member of
Additional physical form
Also available via Intertnet from the NTRS web site. Address as of 08/27/08: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19840009285 %5F1984009285.pdf ; current access is available via PURL.
Cataloging source
COD
http://library.link/vocab/creatorName
MacKay, Rebecca A
Funding information
Grant
Government publication
federal national government publication
Illustrations
  • illustrations
  • charts
Index
no index present
Literary form
non fiction
Nature of contents
  • bibliography
  • technical reports
http://library.link/vocab/relatedWorkOrContributorDate
1984
http://library.link/vocab/relatedWorkOrContributorName
  • Ebert, Lynn J
  • American Institute of Mining, Metallurgical, and Petroleum Engineers
  • Lewis Research Center
  • International Symposium on Superalloys
Series statement
NASA TM
Series volume
83595
http://library.link/vocab/subjectName
  • Heat resistant alloys
  • Heat resistant alloys
  • Creep properties
  • Heat resistant alloys
  • Nickel alloys
  • Single crystals
Label
Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals, Rebecca A. MacKay and Lynn J. Ebert, (microform)
Link
http://purl.access.gpo.gov/GPO/LPS100936
Instantiates
Publication
Note
  • Prepared for the fifth International Symposium on Superalloys sponsored by the American Institute of Mining, Metallurgical and Petroleum Engineers, Seven Springs, Pennsylvania, October 7-11, 1984
  • Available online
Base of film
safety base undetermined
Bibliography note
Includes bibliographical references (p. 10)
Color
black and white
Control code
ocm86073170
Dimensions
28 cm.
Dimensions
4x6 in. or 11x15 cm.
Emulsion on film
diazo
Extent
10 p.
Form of item
microfiche
Generation
service copy
Other physical details
ill.
Positive negative aspect
negative
http://bibfra.me/vocab/marc/reductionRatio
02
ReductionRatioRange
normal reduction
Reproduction note
Microfiche.
Specific material designation
microfiche
Stock number
N 84-17353
System control number
(Sirsi) 1579179
Label
Factors which influence directional coarsening of Gamma prime during creep in nickel-base superalloy single crystals, Rebecca A. MacKay and Lynn J. Ebert, (microform)
Link
http://purl.access.gpo.gov/GPO/LPS100936
Publication
Note
  • Prepared for the fifth International Symposium on Superalloys sponsored by the American Institute of Mining, Metallurgical and Petroleum Engineers, Seven Springs, Pennsylvania, October 7-11, 1984
  • Available online
Base of film
safety base undetermined
Bibliography note
Includes bibliographical references (p. 10)
Color
black and white
Control code
ocm86073170
Dimensions
28 cm.
Dimensions
4x6 in. or 11x15 cm.
Emulsion on film
diazo
Extent
10 p.
Form of item
microfiche
Generation
service copy
Other physical details
ill.
Positive negative aspect
negative
http://bibfra.me/vocab/marc/reductionRatio
02
ReductionRatioRange
normal reduction
Reproduction note
Microfiche.
Specific material designation
microfiche
Stock number
N 84-17353
System control number
(Sirsi) 1579179

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