Compression creep of PM aluminum matrix composites reinforced with SiC short fibres

Autores
Moreno Gomez, Mario Fredy; Gonzalez Oliver, Carlos Julian R.
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The compression creep behaviour of Al–SiCfiber metal matrix composites (MMC), made by hot-pressing (HP), was evaluated at various temperatures and over several orders of magnitude of strain rates. The interpretation of metal flow-patterns during the whole deformation cycle was complex owing to the fact that the short-fibre distribution in the composites was roughly planar. However, every specimen showed a well-defined flow stress or plateau (σp true) up to the end of the tests that were associated with nearly 50% linear compression strains. Such stresses clearly increased with the volume fraction (f) of fibres and strain rates, and decreased with increasing temperatures. Cross-examination of the creep curves [log strain rate (γ˙) versus log shear stress (τ)] for both the HP Al matrix and composites show an apparent stress exponent nap = [δ(lnγ˙)/δ(ln τ)] clearly increasing while decreasing τ. This anomalous behaviour can be attributed to the existence of a finite threshold stress (τ0) for every composition. This threshold stress appears to be related to the oxide contamination (judged from TEM observations) of the matrix, as a result of the use of powder metallurgy (PM) synthesis method. Following certain approximations during deformation behaviour of PM specimens reinforced with ceramic particles, the present data, for short-fibre reinforced MMC, seems to be consistent with the mechanism of dislocation climb that is characterized by an stress exponent of around five, and an activation energy close to that for self-diffusion in pure aluminum (143.2 kJ mol−1).
Fil: Moreno Gomez, Mario Fredy. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Gonzalez Oliver, Carlos Julian R.. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Materia
SiC short-fibres composites
Al matrix
Hot-pressing
Compression creep
Threshold stress
Power law creep n exponent
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/279245
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/279245
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Compression creep of PM aluminum matrix composites reinforced with SiC short fibresMoreno Gomez, Mario FredyGonzalez Oliver, Carlos Julian R.SiC short-fibres compositesAl matrixHot-pressingCompression creepThreshold stressPower law creep n exponenthttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The compression creep behaviour of Al–SiCfiber metal matrix composites (MMC), made by hot-pressing (HP), was evaluated at various temperatures and over several orders of magnitude of strain rates. The interpretation of metal flow-patterns during the whole deformation cycle was complex owing to the fact that the short-fibre distribution in the composites was roughly planar. However, every specimen showed a well-defined flow stress or plateau (σp true) up to the end of the tests that were associated with nearly 50% linear compression strains. Such stresses clearly increased with the volume fraction (f) of fibres and strain rates, and decreased with increasing temperatures. Cross-examination of the creep curves [log strain rate (γ˙) versus log shear stress (τ)] for both the HP Al matrix and composites show an apparent stress exponent nap = [δ(lnγ˙)/δ(ln τ)] clearly increasing while decreasing τ. This anomalous behaviour can be attributed to the existence of a finite threshold stress (τ0) for every composition. This threshold stress appears to be related to the oxide contamination (judged from TEM observations) of the matrix, as a result of the use of powder metallurgy (PM) synthesis method. Following certain approximations during deformation behaviour of PM specimens reinforced with ceramic particles, the present data, for short-fibre reinforced MMC, seems to be consistent with the mechanism of dislocation climb that is characterized by an stress exponent of around five, and an activation energy close to that for self-diffusion in pure aluminum (143.2 kJ mol−1).Fil: Moreno Gomez, Mario Fredy. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Gonzalez Oliver, Carlos Julian R.. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaElsevier Science SA2006-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/279245Moreno Gomez, Mario Fredy; Gonzalez Oliver, Carlos Julian R.; Compression creep of PM aluminum matrix composites reinforced with SiC short fibres; Elsevier Science SA; Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing; 418; 1-2; 12-2006; 172-1810921-5093CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0921509305014577info:eu-repo/semantics/altIdentifier/doi/10.1016/j.msea.2005.11.035info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-02-26T10:25:19Zoai:ri.conicet.gov.ar:11336/279245instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-02-26 10:25:19.418CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
title Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
spellingShingle Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
Moreno Gomez, Mario Fredy
SiC short-fibres composites
Al matrix
Hot-pressing
Compression creep
Threshold stress
Power law creep n exponent
title_short Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
title_full Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
title_fullStr Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
title_full_unstemmed Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
title_sort Compression creep of PM aluminum matrix composites reinforced with SiC short fibres
dc.creator.none.fl_str_mv Moreno Gomez, Mario Fredy
Gonzalez Oliver, Carlos Julian R.
author Moreno Gomez, Mario Fredy
author_facet Moreno Gomez, Mario Fredy
Gonzalez Oliver, Carlos Julian R.
author_role author
author2 Gonzalez Oliver, Carlos Julian R.
author2_role author
dc.subject.none.fl_str_mv SiC short-fibres composites
Al matrix
Hot-pressing
Compression creep
Threshold stress
Power law creep n exponent
topic SiC short-fibres composites
Al matrix
Hot-pressing
Compression creep
Threshold stress
Power law creep n exponent
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The compression creep behaviour of Al–SiCfiber metal matrix composites (MMC), made by hot-pressing (HP), was evaluated at various temperatures and over several orders of magnitude of strain rates. The interpretation of metal flow-patterns during the whole deformation cycle was complex owing to the fact that the short-fibre distribution in the composites was roughly planar. However, every specimen showed a well-defined flow stress or plateau (σp true) up to the end of the tests that were associated with nearly 50% linear compression strains. Such stresses clearly increased with the volume fraction (f) of fibres and strain rates, and decreased with increasing temperatures. Cross-examination of the creep curves [log strain rate (γ˙) versus log shear stress (τ)] for both the HP Al matrix and composites show an apparent stress exponent nap = [δ(lnγ˙)/δ(ln τ)] clearly increasing while decreasing τ. This anomalous behaviour can be attributed to the existence of a finite threshold stress (τ0) for every composition. This threshold stress appears to be related to the oxide contamination (judged from TEM observations) of the matrix, as a result of the use of powder metallurgy (PM) synthesis method. Following certain approximations during deformation behaviour of PM specimens reinforced with ceramic particles, the present data, for short-fibre reinforced MMC, seems to be consistent with the mechanism of dislocation climb that is characterized by an stress exponent of around five, and an activation energy close to that for self-diffusion in pure aluminum (143.2 kJ mol−1).
Fil: Moreno Gomez, Mario Fredy. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
Fil: Gonzalez Oliver, Carlos Julian R.. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina
description The compression creep behaviour of Al–SiCfiber metal matrix composites (MMC), made by hot-pressing (HP), was evaluated at various temperatures and over several orders of magnitude of strain rates. The interpretation of metal flow-patterns during the whole deformation cycle was complex owing to the fact that the short-fibre distribution in the composites was roughly planar. However, every specimen showed a well-defined flow stress or plateau (σp true) up to the end of the tests that were associated with nearly 50% linear compression strains. Such stresses clearly increased with the volume fraction (f) of fibres and strain rates, and decreased with increasing temperatures. Cross-examination of the creep curves [log strain rate (γ˙) versus log shear stress (τ)] for both the HP Al matrix and composites show an apparent stress exponent nap = [δ(lnγ˙)/δ(ln τ)] clearly increasing while decreasing τ. This anomalous behaviour can be attributed to the existence of a finite threshold stress (τ0) for every composition. This threshold stress appears to be related to the oxide contamination (judged from TEM observations) of the matrix, as a result of the use of powder metallurgy (PM) synthesis method. Following certain approximations during deformation behaviour of PM specimens reinforced with ceramic particles, the present data, for short-fibre reinforced MMC, seems to be consistent with the mechanism of dislocation climb that is characterized by an stress exponent of around five, and an activation energy close to that for self-diffusion in pure aluminum (143.2 kJ mol−1).
publishDate 2006
dc.date.none.fl_str_mv 2006-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/279245
Moreno Gomez, Mario Fredy; Gonzalez Oliver, Carlos Julian R.; Compression creep of PM aluminum matrix composites reinforced with SiC short fibres; Elsevier Science SA; Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing; 418; 1-2; 12-2006; 172-181
0921-5093
CONICET Digital
CONICET
url http://hdl.handle.net/11336/279245
identifier_str_mv Moreno Gomez, Mario Fredy; Gonzalez Oliver, Carlos Julian R.; Compression creep of PM aluminum matrix composites reinforced with SiC short fibres; Elsevier Science SA; Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing; 418; 1-2; 12-2006; 172-181
0921-5093
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0921509305014577
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.msea.2005.11.035
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science SA
publisher.none.fl_str_mv Elsevier Science SA
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.176822

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