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Titolo:
Deformed substructures in fine-grained tetragonal zirconia
Autore:
Morita, K; Hiraga, K;
Indirizzi:
Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan Natl Res Inst Met Tsukuba Ibaraki Japan 3050047 a, Ibaraki 3050047, Japan
Titolo Testata:
PHILOSOPHICAL MAGAZINE LETTERS
fascicolo: 5, volume: 81, anno: 2001,
pagine: 311 - 319
SICI:
0950-0839(200105)81:5<311:DSIFTZ>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
YTTRIA-STABILIZED ZIRCONIA; PLASTIC-DEFORMATION; SINGLE-CRYSTALS; SUPERPLASTICITY; POLYCRYSTALS; CERAMICS; FLOW; ZRO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Morita, K Natl Res Inst Met, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, JapanNatl Res Inst Met 1-2-1 Sengen Tsukuba Ibaraki Japan 3050047 pan
Citazione:
K. Morita e K. Hiraga, "Deformed substructures in fine-grained tetragonal zirconia", PHIL MAG L, 81(5), 2001, pp. 311-319

Abstract

Transmission electron microscopy (TEM) has been employed to examine the deformed microstructures of a high-purity tetragonal zirconia polycrystal containing 3 mol% yttria. The TEM observations reveal that piled-up and tangled dislocations are developed within grains at a high stress, but such substructures do not appear at a lower stress, except for a small number of isolated dislocations. The stress-dependent deformed microstructures suggest that the dislocation substructures observed at a high stress are not due to any experimental artefacts. Applying a model proposed by Eshelby et al. to the observed pile-up dislocations, it can be estimated that a stress concentration of the order of 14-25 is generated around multiple-grain junctions during deformation.

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Documento generato il 11/07/20 alle ore 20:51:05