Hot deformation of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] and composite YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]]/Ag

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb05327.x· OSTI ID:5993161

Hendrix, B C; Borofka, J C; Wang, Pin Chin; Tien, J K ^[1]; Abe, Teruyoshi ^[2]

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1. Univ. of Texas, Austin, TX (United States). Strategic Materials Research and Development Lab.
2. Kawasaki Steel, Chiba (Japan)

The response of ceramic superconductors and ceramic composites to compressive stresses at high temperatures has been examined. Monolithic YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] and composite YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]]/Ag were tested at constant true strain rates from 10[sup [minus]6] to 10[sup [minus]3] s[sup [minus]1] at temperatures from 800 to 950 C. Fine-grained monolithic YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] appears to have a regime of superplastic deformation between temperatures of 850 and 950 C at strain rates from 10[sup [minus]6] to 10[sup [minus]4] s[sup [minus]1]. The addition of 20 vol% Ag to a coarser-grained material enhances the ductility of the ceramic and lowers the flow stress by a factor of 3 to 10. However, there is no evidence of superplasticity in the composite material in the range of temperature and strain rate where it was tested.

• OSTI ID: 5993161
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:4; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
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BARIUM OXIDES
CALCINATION
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
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METALS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
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PLASTICITY
PRESSING
PYROLYSIS
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SIZE
SPRAY DRYING
STOICHIOMETRY
SUPERCONDUCTORS
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TRANSITION ELEMENTS
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