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Fatigue hardening in niobium single crystals.Nb single crystals of various orientations were cyclically deformed in tension-compression under strain control. At low strain amplitudes all crystals oriented for single slip and some oriented for multiple slip showed a two stage hardening. When present, the first stage was characterized with almost no cyclic work hardening. The rate of hardening in the second stage increased with strain amplitude and the amount of secondary slip. In crystals oriented for single slip kink bands developed on their side faces during rapid hardening stage which resulted in considerable amount of asterism in Laue spots. A cyclic stress-strain curve independent of prior history was found to exist which was also independent of crystal orientation. Furthermore, this curve differed only slightly from that of polycrystalline Nb obtained from data in literature.
Document ID
19730060672
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Doner, M.
(Kentucky, University Lexington, Ky., United States)
Diprimio, J. C.
(Pittsburgh, University Pittsburgh, Pa.; Comision Nacional de Energia Atomica, Buenos Aires, Argentina)
Salkovitz, E. I.
(Pittsburgh, University Pittsburgh, Pa., United States)
Date Acquired
August 7, 2013
Publication Date
November 1, 1973
Publication Information
Publication: Acta Metallurgica
Volume: 21
Subject Category
Materials, Metallic
Accession Number
73A45474
Funding Number(s)
CONTRACT_GRANT: NGL-39-001-002
Distribution Limits
Public
Copyright
Other

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