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Titolo:
MECHANICAL-PROPERTIES AND MICROSTRUCTURE OF SPUTTER-DEPOSITED NB5SI3 NB MICROLAMINATES/
Autore:
RAWAL SP; SWANSON GM; MOSHIER WC;
Indirizzi:
MARTIN MARIETTA ASTRONAUT,POB 179 DENVER CO 80201
Titolo Testata:
Journal of materials research
fascicolo: 7, volume: 10, anno: 1995,
pagine: 1721 - 1729
SICI:
0884-2914(1995)10:7<1721:MAMOSN>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOSI2-BASE COMPOSITES; ELASTIC-MODULUS; SUPERLATTICES; HARDNESS; NICKEL; NANOINDENTATION; ALLOYS; FOILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Rawal et al., "MECHANICAL-PROPERTIES AND MICROSTRUCTURE OF SPUTTER-DEPOSITED NB5SI3 NB MICROLAMINATES/", Journal of materials research, 10(7), 1995, pp. 1721-1729

Abstract

Crystalline Nb5Si3/Nb microlaminates were fabricated to a thickness of 20 mu m by depositing the materials onto elevated temperature (750 degrees C) substrates. Modulation wavelengths of the microlaminates were varied (lambda = 40 and 200 nm) while holding their silicide volume fraction constant to assess the effect of layer thickness on the composite properties. X-ray and selected area diffraction confirmed that both the metal and silicide layers exhibited a polycrystalline structurein the as-deposited microlaminates. Nanoindentation measurements of both microlaminates indicated that calculated elastic modulus values were similar to the values obtained by the rule-of-mixtures (ROM). Nanohardness values of the microlaminates increased with decreasing wavelength in a manner described by the Hall-Fetch relationship. Vickers hardness (Hv) measurements were also found to be a function of the modulation wavelength, decreasing from 7.32 GPa at lambda = 40 nm to 3.04 GPaat lambda = 200 nm. Even with a Nb volume fraction of 50%, the lambda= 40 nm microlaminate and the monolithic Nb5Si3 film exhibited similar Vickers hardness values of 7.5 GPa. These results show the significant role of modulation wavelength on the hardness, compressive strength, and toughness characteristics of a microlaminate composite.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 10:30:20