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Titolo:
Superplastic deformation of continuous fiber reinforced titanium matrix composites
Autore:
Yamada, T; Tsuzuku, T; Sato, H;
Indirizzi:
Mitsubishi Heavy Ind Ltd, Nagoya Aerosp Syst, Engn Res Dept, Mat Res Sect,Nagoya, Aichi 4558515, Japan Mitsubishi Heavy Ind Ltd Nagoya Aichi Japan 4558515 Aichi 4558515, Japan
Titolo Testata:
MATERIALS TRANSACTIONS
fascicolo: 5, volume: 42, anno: 2001,
pagine: 842 - 849
SICI:
1345-9678(200105)42:5<842:SDOCFR>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRAIN RATE SUPERPLASTICITY; TRANSVERSE CREEP; MECHANISM; FAILURE; MICROSTRUCTURE; STRENGTH; STRESS; ALLOY; FLOW;
Keywords:
titanium matrix composite; SP-700; SCS-6; silicon carbide; superplastic forming; superplasticity; sprayed preform; plasma;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Yamada, T Mitsubishi Heavy Ind Ltd, Nagoya Aerosp Syst, Engn Res Dept, MatRes Sect,Nagoya, Aichi 4558515, Japan Mitsubishi Heavy Ind Ltd Nagoya Aichi Japan 4558515 8515, Japan
Citazione:
T. Yamada et al., "Superplastic deformation of continuous fiber reinforced titanium matrix composites", MATER TRANS, 42(5), 2001, pp. 842-849

Abstract

Continuous fiber reinforced titanium matrix composites (TMCs) are attractive as potential structural materials for aerospace applications. because oftheir high specific strength and stiffness. However, TMC parts have not yet been pur into practical use due to their limited damage tolerance and theenormous production cost resulting from preliminary forming and elaborate tooling for consolidation. In order to reduce tile production cost, superplastic TMC sheets (SiC/Ti-4.5Al-3V-2Mo-2Fe) were developed, and the deformation characteristics. and cavitation behavior were investigated. In this: study, plasma-sprayed preforms. which replace conventional woven preforms were newly developed tc, improve the cavitation resistance. The superplastic deformation characteristics. and the cavitation behavior of. SiC/Ti-4.5Al-3V-2Mo-2Fe composites made of sprayed preforms (spray composites) were investigated. The fiber spacing in the spray composites was controlled more uniformly than that in composites fabricated from woven preforms (woven composites). and two closely spaced libels were rarely found in the spray composites. The spray composites showed cavitation-induced superplasticity M with the strain rate sensitivity exponent (m) being 0.58 at 1048 K, over the strain rate range of 5 x 10(-5) s(-1) to 1 x 10(-3) s(-1). This indicated greater elongation than that in the case of. tile woven composites, which may be due to the improved uniformity of fiber distribution. Most of the defects observed in the deformed pray composites were defects due to fiber/matrix interface separation (type-l). On the other hand, those observed in the deformed woven composites were defects caused by weaving ribbons (type-2) or narrow fiber spacing (type-3). They were less related to the deformation conditions. This suggested that the sprayed preforms were effective in preventing the occurrence of type-2 and type-3 defects. The occurrence of type-1 defects was strongly related to the maximum flow stress during deformation, and the occurrence of such defects rapidly increased with the maximum Bow stress exceeding the threshold stress of 18 MPa.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 09:43:49