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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/173744
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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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1844614019435986944 |
score |
13.070432 |