Micro-mechanical response of ultrafine grain and nanocrystalline tantalum

Autores
Yang, Wen; Ruestes, Carlos Javier; Li, Zezhou; Abad, Oscar Torrents; Langdon, Terence G.; Heiland, Birgit; Koch, Marcus; Arzt, Eduard; Meyers, Marc A.
Año de publicación
2021
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In order to investigate the effect of grain boundaries on the mechanical response in the micrometer and submicrometer levels, complementary experiments and molecular dynamics simulations were conducted on a model bcc metal, tantalum. Microscale pillar experiments (diameters of 1 and 2 μm) with a grain size of ~100-200 nm revealed a mechanical response characterized by a yield stress of ~1500 MPa. The hardening of the structure is reflected in the increase in the flow stress to 1700 MPa at a strain of ~0.35. Molecular dynamics simulations were conducted for nanocrystalline tantalum with grain sizes in the range of 20-50 nm and pillar diameters in the same range. The yield stress was approximately 6000 MPa for all specimens and the maximum of the stress-strain curves occurred at a strain of 0.07. Beyond that strain, the material softened because of its inability to store dislocations. The experimental results did not show a significant size dependence of yield stress on pillar diameter (equal to 1 and 2 um), which is attributed to the high ratio between pillar diameter and grain size (~10-20). This behavior is quite different from that in monocrystalline specimens where dislocation 'starvation' leads to a significant size dependence of strength. The ultrafine grains exhibit clear 'pancaking' upon being plastically deformed, with an increase in dislocation density. The plastic deformation is much more localized for the single crystals than for the nanocrystalline specimens, an observation made in both modeling and experiments. In the molecular dynamics simulations, the ratio of pillar diameter (20-50 nm) to grain size was in the range 0.2-2, and a much greater dependence of yield stress to pillar diameter was observed. A critical result from this work is the demonstration that the important parameter in establishing the overall deformation is the ratio between the grain size and pillar diameter; it governs the deformation mode, as well as surface sources and sinks, which are only important when the grain size is of the same order as the pillar diameter.
Fil: Yang, Wen. University of California at San Diego; Estados Unidos
Fil: Ruestes, Carlos Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; Argentina
Fil: Li, Zezhou. University of California at San Diego; Estados Unidos
Fil: Abad, Oscar Torrents. Leibniz Institute for New Materials; Alemania
Fil: Langdon, Terence G.. University of Southern California; Estados Unidos
Fil: Heiland, Birgit. Leibniz Institute for New Materials; Alemania
Fil: Koch, Marcus. Leibniz Institute for New Materials; Alemania
Fil: Arzt, Eduard. Leibniz Institute for New Materials; Alemania. Universitat Saarland; Alemania
Fil: Meyers, Marc A.. University of California at San Diego; Estados Unidos
Materia
MICROPILLAR
NANOCRYSTALLINE
TANTALUM
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/173744

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network_name_str CONICET Digital (CONICET)
spelling Micro-mechanical response of ultrafine grain and nanocrystalline tantalumYang, WenRuestes, Carlos JavierLi, ZezhouAbad, Oscar TorrentsLangdon, Terence G.Heiland, BirgitKoch, MarcusArzt, EduardMeyers, Marc A.MICROPILLARNANOCRYSTALLINETANTALUMhttps://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2In order to investigate the effect of grain boundaries on the mechanical response in the micrometer and submicrometer levels, complementary experiments and molecular dynamics simulations were conducted on a model bcc metal, tantalum. Microscale pillar experiments (diameters of 1 and 2 μm) with a grain size of ~100-200 nm revealed a mechanical response characterized by a yield stress of ~1500 MPa. The hardening of the structure is reflected in the increase in the flow stress to 1700 MPa at a strain of ~0.35. Molecular dynamics simulations were conducted for nanocrystalline tantalum with grain sizes in the range of 20-50 nm and pillar diameters in the same range. The yield stress was approximately 6000 MPa for all specimens and the maximum of the stress-strain curves occurred at a strain of 0.07. Beyond that strain, the material softened because of its inability to store dislocations. The experimental results did not show a significant size dependence of yield stress on pillar diameter (equal to 1 and 2 um), which is attributed to the high ratio between pillar diameter and grain size (~10-20). This behavior is quite different from that in monocrystalline specimens where dislocation 'starvation' leads to a significant size dependence of strength. The ultrafine grains exhibit clear 'pancaking' upon being plastically deformed, with an increase in dislocation density. The plastic deformation is much more localized for the single crystals than for the nanocrystalline specimens, an observation made in both modeling and experiments. In the molecular dynamics simulations, the ratio of pillar diameter (20-50 nm) to grain size was in the range 0.2-2, and a much greater dependence of yield stress to pillar diameter was observed. A critical result from this work is the demonstration that the important parameter in establishing the overall deformation is the ratio between the grain size and pillar diameter; it governs the deformation mode, as well as surface sources and sinks, which are only important when the grain size is of the same order as the pillar diameter.Fil: Yang, Wen. University of California at San Diego; Estados UnidosFil: Ruestes, Carlos Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; ArgentinaFil: Li, Zezhou. University of California at San Diego; Estados UnidosFil: Abad, Oscar Torrents. Leibniz Institute for New Materials; AlemaniaFil: Langdon, Terence G.. University of Southern California; Estados UnidosFil: Heiland, Birgit. Leibniz Institute for New Materials; AlemaniaFil: Koch, Marcus. Leibniz Institute for New Materials; AlemaniaFil: Arzt, Eduard. Leibniz Institute for New Materials; Alemania. Universitat Saarland; AlemaniaFil: Meyers, Marc A.. University of California at San Diego; Estados UnidosElsevier2021-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/173744Yang, Wen; Ruestes, Carlos Javier; Li, Zezhou; Abad, Oscar Torrents; Langdon, Terence G.; et al.; Micro-mechanical response of ultrafine grain and nanocrystalline tantalum; Elsevier; Journal of Materials Research and Technology; 12; 5-2021; 1804-18152238-7854CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S2238785421003070info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmrt.2021.03.080info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:47Zoai:ri.conicet.gov.ar:11336/173744instacron: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:34982025-09-29 10:11:47.732CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
title Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
spellingShingle Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
Yang, Wen
MICROPILLAR
NANOCRYSTALLINE
TANTALUM
title_short Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
title_full Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
title_fullStr Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
title_full_unstemmed Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
title_sort Micro-mechanical response of ultrafine grain and nanocrystalline tantalum
dc.creator.none.fl_str_mv Yang, Wen
Ruestes, Carlos Javier
Li, Zezhou
Abad, Oscar Torrents
Langdon, Terence G.
Heiland, Birgit
Koch, Marcus
Arzt, Eduard
Meyers, Marc A.
author Yang, Wen
author_facet Yang, Wen
Ruestes, Carlos Javier
Li, Zezhou
Abad, Oscar Torrents
Langdon, Terence G.
Heiland, Birgit
Koch, Marcus
Arzt, Eduard
Meyers, Marc A.
author_role author
author2 Ruestes, Carlos Javier
Li, Zezhou
Abad, Oscar Torrents
Langdon, Terence G.
Heiland, Birgit
Koch, Marcus
Arzt, Eduard
Meyers, Marc A.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv MICROPILLAR
NANOCRYSTALLINE
TANTALUM
topic MICROPILLAR
NANOCRYSTALLINE
TANTALUM
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv In order to investigate the effect of grain boundaries on the mechanical response in the micrometer and submicrometer levels, complementary experiments and molecular dynamics simulations were conducted on a model bcc metal, tantalum. Microscale pillar experiments (diameters of 1 and 2 μm) with a grain size of ~100-200 nm revealed a mechanical response characterized by a yield stress of ~1500 MPa. The hardening of the structure is reflected in the increase in the flow stress to 1700 MPa at a strain of ~0.35. Molecular dynamics simulations were conducted for nanocrystalline tantalum with grain sizes in the range of 20-50 nm and pillar diameters in the same range. The yield stress was approximately 6000 MPa for all specimens and the maximum of the stress-strain curves occurred at a strain of 0.07. Beyond that strain, the material softened because of its inability to store dislocations. The experimental results did not show a significant size dependence of yield stress on pillar diameter (equal to 1 and 2 um), which is attributed to the high ratio between pillar diameter and grain size (~10-20). This behavior is quite different from that in monocrystalline specimens where dislocation 'starvation' leads to a significant size dependence of strength. The ultrafine grains exhibit clear 'pancaking' upon being plastically deformed, with an increase in dislocation density. The plastic deformation is much more localized for the single crystals than for the nanocrystalline specimens, an observation made in both modeling and experiments. In the molecular dynamics simulations, the ratio of pillar diameter (20-50 nm) to grain size was in the range 0.2-2, and a much greater dependence of yield stress to pillar diameter was observed. A critical result from this work is the demonstration that the important parameter in establishing the overall deformation is the ratio between the grain size and pillar diameter; it governs the deformation mode, as well as surface sources and sinks, which are only important when the grain size is of the same order as the pillar diameter.
Fil: Yang, Wen. University of California at San Diego; Estados Unidos
Fil: Ruestes, Carlos Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; Argentina
Fil: Li, Zezhou. University of California at San Diego; Estados Unidos
Fil: Abad, Oscar Torrents. Leibniz Institute for New Materials; Alemania
Fil: Langdon, Terence G.. University of Southern California; Estados Unidos
Fil: Heiland, Birgit. Leibniz Institute for New Materials; Alemania
Fil: Koch, Marcus. Leibniz Institute for New Materials; Alemania
Fil: Arzt, Eduard. Leibniz Institute for New Materials; Alemania. Universitat Saarland; Alemania
Fil: Meyers, Marc A.. University of California at San Diego; Estados Unidos
description In order to investigate the effect of grain boundaries on the mechanical response in the micrometer and submicrometer levels, complementary experiments and molecular dynamics simulations were conducted on a model bcc metal, tantalum. Microscale pillar experiments (diameters of 1 and 2 μm) with a grain size of ~100-200 nm revealed a mechanical response characterized by a yield stress of ~1500 MPa. The hardening of the structure is reflected in the increase in the flow stress to 1700 MPa at a strain of ~0.35. Molecular dynamics simulations were conducted for nanocrystalline tantalum with grain sizes in the range of 20-50 nm and pillar diameters in the same range. The yield stress was approximately 6000 MPa for all specimens and the maximum of the stress-strain curves occurred at a strain of 0.07. Beyond that strain, the material softened because of its inability to store dislocations. The experimental results did not show a significant size dependence of yield stress on pillar diameter (equal to 1 and 2 um), which is attributed to the high ratio between pillar diameter and grain size (~10-20). This behavior is quite different from that in monocrystalline specimens where dislocation 'starvation' leads to a significant size dependence of strength. The ultrafine grains exhibit clear 'pancaking' upon being plastically deformed, with an increase in dislocation density. The plastic deformation is much more localized for the single crystals than for the nanocrystalline specimens, an observation made in both modeling and experiments. In the molecular dynamics simulations, the ratio of pillar diameter (20-50 nm) to grain size was in the range 0.2-2, and a much greater dependence of yield stress to pillar diameter was observed. A critical result from this work is the demonstration that the important parameter in establishing the overall deformation is the ratio between the grain size and pillar diameter; it governs the deformation mode, as well as surface sources and sinks, which are only important when the grain size is of the same order as the pillar diameter.
publishDate 2021
dc.date.none.fl_str_mv 2021-05
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/11336/173744
Yang, Wen; Ruestes, Carlos Javier; Li, Zezhou; Abad, Oscar Torrents; Langdon, Terence G.; et al.; Micro-mechanical response of ultrafine grain and nanocrystalline tantalum; Elsevier; Journal of Materials Research and Technology; 12; 5-2021; 1804-1815
2238-7854
CONICET Digital
CONICET
url http://hdl.handle.net/11336/173744
identifier_str_mv Yang, Wen; Ruestes, Carlos Javier; Li, Zezhou; Abad, Oscar Torrents; Langdon, Terence G.; et al.; Micro-mechanical response of ultrafine grain and nanocrystalline tantalum; Elsevier; Journal of Materials Research and Technology; 12; 5-2021; 1804-1815
2238-7854
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/pii/S2238785421003070
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmrt.2021.03.080
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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