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Titolo:
Residual stress and subsurface damage in machined alumina and alumina/silicon carbide nanocomposite ceramics
Autore:
Wu, H; Roberts, SG; Derby, B;
Indirizzi:
Univ Manchester, Inst Sci & Technol, Manchester Mat Sci Ctr, Manchester M17HS, Lancs, England Univ Manchester Manchester Lancs England M1 7HS ter M17HS, Lancs, England Univ Oxford, Dept Mat, Oxford OX1 3PH, England Univ Oxford Oxford England OX1 3PH rd, Dept Mat, Oxford OX1 3PH, England
Titolo Testata:
ACTA MATERIALIA
fascicolo: 3, volume: 49, anno: 2001,
pagine: 507 - 517
SICI:
1359-6454(20010208)49:3<507:RSASDI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SILICON-CARBIDE; AL2O3/SIC NANOCOMPOSITES; AL2O3-SIC NANOCOMPOSITES; PLASTIC-DEFORMATION; BRITTLE MATERIALS; MECHANICAL-PROPERTIES; HERTZIAN INDENTATION; FRACTURE; BEHAVIOR; WEAR;
Keywords:
residual stress; transmission electron microscopy (TEM); dislocations; ceramics; microstructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Derby, B Univ Manchester, Inst Sci & Technol, Manchester Mat Sci Ctr, Manchester M17HS, Lancs, England Univ Manchester Manchester Lancs England M1 7HS , Lancs, England
Citazione:
H. Wu et al., "Residual stress and subsurface damage in machined alumina and alumina/silicon carbide nanocomposite ceramics", ACT MATER, 49(3), 2001, pp. 507-517

Abstract

We have used TEM and Hertzian indentation to study the interrelation between subsurface damage and residual stress introduced by grinding and diamondpolishing surfaces of polycrystalline alumina and 5%SiC/alumina nanocomposites. In all cases a layer of high dislocation density was found near the surface. This varied in thickness from about 300 nm for alumina polished with 1 mum diamond grit to greater than 6 mum for a nanocomposite surface wheel-ground with 150 mum diamond grit. For a given finishing process the nanocomposites showed a greater depth of dislocation activity than alumina. In alumina, extensive basal twinning was found beneath the ground surfaces. Hertzian indentation data indicates a residual compressive stress of about 1500 MPa confined to the dislocation-containing region. Mechanisms for the enhanced dislocation activity in the nanocomposites are discussed. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:45:45