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Titolo:
Thermal residual stresses in NiAl-AlN-Al2O3 composites measured by neutrondiffraction
Autore:
Choo, H; Bourke, M; Nash, P; Daymond, M; Shi, N;
Indirizzi:
Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 cattering Ctr, Los IIT, Chicago, IL 60616 USA IIT Chicago IL USA 60616IIT, Chicago, IL 60616 USA
Titolo Testata:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
fascicolo: 1-2, volume: 264, anno: 1999,
pagine: 108 - 121
SICI:
0921-5093(19990531)264:1-2<108:TRSINC>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
MECHANICAL-PROPERTIES; MATRIX;
Keywords:
residual stress; neutron diffraction; NiAl; composite;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Choo, H Univ Calif Los Alamos Natl Lab, Manuel Lujan Jr Neutron ScatteringCtr, POB Univ Calif Los Alamos Natl Lab POB 1663 Los Alamos NM USA 87545 OB
Citazione:
H. Choo et al., "Thermal residual stresses in NiAl-AlN-Al2O3 composites measured by neutrondiffraction", MAT SCI E A, 264(1-2), 1999, pp. 108-121

Abstract

Thermal residual stresses in NiAl-(AlN)(Particle)-(Al2O3)(Fiber) composites were measured at room temperature for two Al2O3 fiber volume fractions (5and 30%) using neutron powder diffraction. Lattice parameters in each phase were obtained by refining diffraction patterns using Rietveld analysis and lattice strains were calculated from changes in their values. By assuminga volume averaged hydrostatic situation, in conjunction with an FE model that was used to infer the initial stresses between NiAl and AlN, the strains were converted into stresses. The tensile residual stresses in the NiAl matrix were 0.2 and 0.6 GPa for the 5 and 30% Al2O3 composites respectively. The compressive residual stress in the AlN dispersion particles decreased from -1.5 to -1.1 GPa as the fiber volume fraction increased from 5 to 30%. The compressive residual stresses in the Al2O3 fibers were -1.7 and -1.3 GPa for the 5 and 30% Al2O3 composites respectively. (C) 1999 Elsevier Science S.A. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/10/20 alle ore 01:48:48