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Titolo:
MECHANICAL-PROPERTIES OF NIAL-ALN-AL2O3 COMPOSITES
Autore:
CHOO H; NASH P; DOLLAR M;
Indirizzi:
IIT,DEPT MECH MAT & AEROSP ENNG CHICAGO IL 60616
Titolo Testata:
Materials science & engineering. A, Structural materials: properties, microstructure and processing
, volume: 240, anno: 1997,
pagine: 464 - 471
SICI:
0921-5093(1997)240:<464:MONC>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICULATE; DEFORMATION; 1300-K;
Keywords:
CREEP; NIAL; COMPOSITES; MECHANICAL PROPERTIES;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
H. Choo et al., "MECHANICAL-PROPERTIES OF NIAL-ALN-AL2O3 COMPOSITES", Materials science & engineering. A, Structural materials: properties, microstructure and processing, 240, 1997, pp. 464-471

Abstract

The mechanical properties of NiAl-based composites containing a dispersion of AIN particles and Al2O3 fibers were studied. NiAl matrix powder containing a dispersion of about 5 vol.% AlN was synthesized by mechanical alloying (MA) of elemental nickel and aluminum under a nitrogen gas atmosphere. Nextel 610 short fibers were used as the second reinforcement in the composite. Composites containing 5, 15 and 30 vol.% of the Al2O3 fibers in addition to the AIN dispersion particles were fabricated by hot pressing a dry blend of the MA NiAl powder and the fibers. The as-fabricated microstructures revealed that the matrix is fully dense and bonded well with the randomly distributed Al2O3, fibers. Neither chemical reaction nor cracks were observed at the fiber/matrixinterface. Compressive behavior of the composites and a monolithic counterpart was studied at 1300 K and strain rates between 8.5 x 10(-4) and 2.8 x 10(-6) s(-1). The 0.2% yield stress of the composites increases with fiber volume fraction at all strain rates. The strain rate-flow stress behavior at 1300 K indicates that the strength of NiAl-5%AIN-30%Al2O3 approaches that of NASAIR 100, a first generation Ni-base single crystal superalloy. (C) 1997 Elsevier Science S.A.

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Documento generato il 29/09/20 alle ore 04:30:46