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Creep and stress rupture of a mechanically alloyed oxide dispersion and precipitation strengthened nickel-base superalloyThe creep and stress rupture behavior of a mechanically alloyed oxide dispersion strengthened (ODS) and gamma-prime precipitation strengthened nickel-base alloy (alloy MA 6000E) was studied at intermediate and elevated temperatures. At 760 C, MA 6000E exhibits the high creep strength characteristic of nickel-base superalloys and at 1093 C the creep strength is superior to other ODS nickel-base alloys. The stress dependence of the creep rate is very sharp at both test temperatures and the apparent creep activation energy measured around 760 C is high, much larger in magnitude than the self-diffusion energy. Stress rupture in this large grain size material is transgranular and crystallographic cracking is observed. The rupture ductility is dependent on creep strain rate, but usually is low. These and accompanying microstructural results are discussed with respect to other ODS alloys and superalloys and the creep behavior is rationalized by invoking a recently-developed resisting stress model of creep in materials strengthened by second phase particles.
Document ID
19800067706
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Howson, T. E.
(Columbia Univ. New York, NY, United States)
Tien, J. K.
(Columbia University New York, N.Y., United States)
Mervyn, D. A.
(Westinghouse Hanford Co. Richland, Wash., United States)
Date Acquired
August 10, 2013
Publication Date
September 1, 1980
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 11A
Subject Category
Metallic Materials
Accession Number
80A51876
Funding Number(s)
CONTRACT_GRANT: NSF DMR-77-11281
CONTRACT_GRANT: NSG-3050
Distribution Limits
Public
Copyright
Other

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