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Creep and rupture of an ODS alloy with high stress rupture ductilityThe creep and stress rupture properties of an oxide (Y2O3) dispersion strengthened nickel-base alloy, which also is strengthened by gamma-prime precipitates, was studied at 760 and 1093 C. At both temperatures, the alloy YDNiCrAl exhibits unusually high stress rupture ductility as measured by both elongation and reduction in area. Failure was transgranular, and different modes of failure were observed including crystallographic fracture at intermediate temperatures and tearing or necking almost to a chisel point at higher temperatures. While the rupture ductility was high, the creep strength of the alloy was low relative to conventional gamma prime strengthened superalloys in the intermediate temperature range and to ODS alloys in the higher temperature range. These findings are discussed with respect to the alloy composition; the strengthening oxide phases, which are inhomogeneously dispersed; the grain morphology, which is coarse and elongated and exhibits many included grains; and the second phase inclusion particles occurring at grain boundaries and in the matrix. The creep properties, in particular the high stress dependencies and high creep activation energies measured, are discussed with respect to the resisting stress model of creep in particle strengthened alloys.
Document ID
19820056800
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mcalarney, M. E.
(Celanese Research Corp. Summit, NJ, United States)
Arsons, R. M.
(Celanese Research Center Summit, NJ, United States)
Howson, T. E.
(Celanese Research Corp. Summit, NJ, United States)
Tien, J. K.
(Columbia University New York, NY, United States)
Baranow, S.
(Special Metals Corp. New Hartford, NY, United States)
Date Acquired
August 10, 2013
Publication Date
August 1, 1982
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 13A
Subject Category
Metallic Materials
Accession Number
82A40335
Funding Number(s)
CONTRACT_GRANT: NSG-3050
Distribution Limits
Public
Copyright
Other

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