Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Physical and mechanical properties of single crystals of the T-2 phase in the Mo-Si-B system
Autore:
Ito, K; Ihara, K; Tanaka, K; Fujikura, M; Yamaguchi, M;
Indirizzi:
Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 Dept Mat Sci & Engn, Kyoto 6068501, Japan Japan Ultra High Temp Mat Res Ctr Ltd, Tajimi, Gifu 5070801, Japan Japan Ultra High Temp Mat Res Ctr Ltd Tajimi Gifu Japan 5070801 01, Japan
Titolo Testata:
INTERMETALLICS
fascicolo: 7, volume: 9, anno: 2001,
pagine: 591 - 602
SICI:
0966-9795(200107)9:7<591:PAMPOS>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLASTIC-DEFORMATION; OXIDATION BEHAVIOR; THERMAL-EXPANSION; ELASTIC-CONSTANTS; BORON; CREEP; SILICIDES; INTERMETALLICS; MO5SI3; MOSI2;
Keywords:
molybdenum silicides; mechanical properties at high temperatures; elastic properties; thermal properties; electrical resistance and other electrical properties;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Ito, K Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 t Sci & Engn, Kyoto 6068501, Japan
Citazione:
K. Ito et al., "Physical and mechanical properties of single crystals of the T-2 phase in the Mo-Si-B system", INTERMETALL, 9(7), 2001, pp. 591-602

Abstract

The T-2 phase in the Mo-Si-B system is a refractory molybdenum borosilicide with great potential for ultra-high temperature structural applications. We recently succeeded in growing high purity single crystals of the T-2 phase with a composition of Mo-14Si-26B (at.%) using an optical floating zone method. Electrical resistivity of the T-2 phase is isotropic with respect to the a and c axes and it monotonously increases with temperature from similar to 40 mu Omega cm at room temperature to similar to 80 mu Omega cm at 800 degreesC. The anisotropy ratio of thermal expansion coefficient (alpha (c)/alpha (a)) of the T2 phase is approximately 1.4 at 500 degreesC which issignificantly smaller than 2.2 for Mo5Si3. The bulk, shear and Young's moduli and the Debye temperature of the T-2 phase are slightly higher than those of Mo5Si3. Slip on [001]{100} was observed on [021] oriented specimens both compressed and crept at 1500 degreesC. However, slip on < 100 > (001), which has been reported to be operative, was not observed. [001] dislocations are mostly straight and long, and tend to align along their edge orientation. The preference for slip on [001]{100} is interpreted on the basis of the crystal structure. The steady-state creep rate is low under the creep conditions. It is, for example, 3.1x10(-8) s(-1) at 1500 degreesC and 432 MPa. The activation energy and stress exponent for creep was found to be similar to 740 kJ/mol and 6.8, respectively. (C) 2001 Elsevier Science Ltd. Allrights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/10/20 alle ore 01:49:46