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Titolo:
Microstructure and room temperature deformation of Nb-ss/Nb5Si3 in situ composites alloyed with Mo
Autore:
Kim, WY; Tanaka, H; Kasama, A; Tanaka, R; Hanada, S;
Indirizzi:
Japan Ultrahigh Temp Mat Res Inst, JUTEMI, Ube, Yamaguchi 7550001, Japan Japan Ultrahigh Temp Mat Res Inst Ube Yamaguchi Japan 7550001 0001, Japan Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan Tohoku Univ Sendai Miyagi Japan 9808577 es, Sendai, Miyagi 9808577, Japan
Titolo Testata:
INTERMETALLICS
fascicolo: 6, volume: 9, anno: 2001,
pagine: 521 - 527
SICI:
0966-9795(200106)9:6<521:MARTDO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Keywords:
silicides, various; phase transformations; phase diagram; twinning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, WY Japan Ultrahigh Temp Mat Res Inst, JUTEMI, 573-3 Okiube, Ube, Yamaguchi 7550001, Japan Japan Ultrahigh Temp Mat Res Inst 573-3 Okiube Ube Yamaguchi Japan 7550001
Citazione:
W.Y. Kim et al., "Microstructure and room temperature deformation of Nb-ss/Nb5Si3 in situ composites alloyed with Mo", INTERMETALL, 9(6), 2001, pp. 521-527

Abstract

Room temperature deformation behavior of Nb5Si3 based intermetallics in the ternary Nb-Si-Mo alloy system is investigated by compression testing in relation to microstructure and compositional effect. The partial ternary phase diagram of the Nb-Si-Mo alloy system containing phase equilibrium information at 1973 K is determined by metallography, X-ray diffraction and scanning electron microscopy (SEM) equipped with wavelength-dispersive X-ray fluorescence spectroscopy (WDS). A pseudo-binary compound of Nb5Si3-Mo5Si3 is confirmed to form at Nb5Si3-rich compositions by Mo addition, without having a solubility range of Si. The phase transformation from alpha -Nb5Si3 to beta -Nb5Si3 is found to occur at about 5 at.% of Mo content on the Nb5Si3-Mo5Si3 pseudo-binary line. The observed yield stresses are largely dependent on not only the volume fraction and morphology of constituent phases but also the strength of Nb5Si3 phase equilibrating with Nb solid solution. Thein situ composites consisting of alpha -Nb5Si3 phase and bcc solid solution exhibit higher yield stress than those consisting of beta -Nb5Si3 phase and bcc solid solution when yield stress is compared at the same volume fraction of bcc phase. It is suggested that room temperature deformability of beta -Nb5Si3 is superior to that of alpha -Nb5Si3 phase. Room temperature deformation behavior of the present composites will be discussed in relation to microstructural evolution. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 15:06:18