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Titolo:
Cyclic saturation behavior of tungsten monofilament-reinforced monocrystalline copper matrix composites
Autore:
Zhang, J; Laird, C;
Indirizzi:
Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 ci & Engn, Philadelphia, PA 19104 USA
Titolo Testata:
ACTA MATERIALIA
fascicolo: 14, volume: 47, anno: 1999,
pagine: 3825 - 3839
SICI:
1359-6454(19991026)47:14<3825:CSBOTM>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONSTANT STRAIN AMPLITUDE; SINGLE-CRYSTALS; FATIGUE BEHAVIOR; GROWTH-KINETICS; LOCALIZATION; DEFORMATION; LIFE; TEMPERATURE; DEPENDENCE; POPULATION;
Keywords:
cyclic deformation; fatigue; composites; metals; dislocations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Laird, C Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USA Univ Penn 3231 Walnut St Philadelphia PA USA 19104 , PA 19104 USA
Citazione:
J. Zhang e C. Laird, "Cyclic saturation behavior of tungsten monofilament-reinforced monocrystalline copper matrix composites", ACT MATER, 47(14), 1999, pp. 3825-3839

Abstract

Studies on saturation behavior produced by cyclic deformation have been conducted on tungsten monofilament-reinforced monocrystalline copper composites. The effect of the fiber on strain localization has been investigated using interferometry. For a given applied strain amplitude, local strain and volume fraction of the persistent slip bands (PSBs) in the composite appeared no different from those observed in monolithic copper single crystals. However, the distribution of the PSBs was observed to be more uniform, and the total number of PSBs is substantially higher than that in monolithic crystals. The PSBs appeared mostly in the form of micro-PSBs or macro-PSBs with very limited width. Instead of expanding existing PSBs, new PSBs were more likely to nucleate at new locations during cyclic deformation. The volumefraction and width of the PSBs were observed to increase during saturation, which indicates that some of the PSBs become aged and new PSBs form in order to continue to carry the plastic strain. A rule of mixtures model was established to link the cyclic stress-strain response of the monocrystallinecomposites to the behavior of monolithic single crystals and fibers. The results calculated from the model show Very good agreement with the experimental data. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 16/07/20 alle ore 18:48:34