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In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope

The determination of the mechanical properties of serpentinites is essential toward the understanding of the mechanics of faulting and subduction. Here we present the first in situ tensile tests on antigorite in a transmission electron microscope. A push‐to‐pull deformation device is used to perform...

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Autores principales: Idrissi, Hosni, Samaee, Vahid, Lumbeeck, Gunnar, van der Werf, Thomas, Pardoen, Thomas, Schryvers, Dominique, Cordier, Patrick
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7375155/
https://www.ncbi.nlm.nih.gov/pubmed/32714729
http://dx.doi.org/10.1029/2019JB018383
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author Idrissi, Hosni
Samaee, Vahid
Lumbeeck, Gunnar
van der Werf, Thomas
Pardoen, Thomas
Schryvers, Dominique
Cordier, Patrick
author_facet Idrissi, Hosni
Samaee, Vahid
Lumbeeck, Gunnar
van der Werf, Thomas
Pardoen, Thomas
Schryvers, Dominique
Cordier, Patrick
author_sort Idrissi, Hosni
collection PubMed
description The determination of the mechanical properties of serpentinites is essential toward the understanding of the mechanics of faulting and subduction. Here we present the first in situ tensile tests on antigorite in a transmission electron microscope. A push‐to‐pull deformation device is used to perform quantitative tensile tests, during which force and displacement are measured, while the evolving microstructure is imaged with the microscope. The experiments have been performed at room temperature on 2 × 1 × 0.2 μm(3) beams prepared by focused ion beam. The specimens are not single crystals despite their small sizes. Orientation mapping indicated that several grains were well oriented for plastic slip. However, no dislocation activity has been observed even though the engineering tensile stress went up to 700 MPa. We show also that antigorite does not exhibit a purely elastic‐brittle behavior since, despite the presence of defects, the specimens accumulate permanent deformation and did not fail within the elastic regime. Instead, we observe that strain localizes at grain boundaries. All observations concur to show that under these experimental conditions, grain boundary sliding is the dominant deformation mechanism. This study sheds a new light on the mechanical properties of antigorite and calls for further studies on the structure and properties of grain boundaries in antigorite and more generally in phyllosilicates.
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spelling pubmed-73751552020-07-23 In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope Idrissi, Hosni Samaee, Vahid Lumbeeck, Gunnar van der Werf, Thomas Pardoen, Thomas Schryvers, Dominique Cordier, Patrick J Geophys Res Solid Earth Research Articles The determination of the mechanical properties of serpentinites is essential toward the understanding of the mechanics of faulting and subduction. Here we present the first in situ tensile tests on antigorite in a transmission electron microscope. A push‐to‐pull deformation device is used to perform quantitative tensile tests, during which force and displacement are measured, while the evolving microstructure is imaged with the microscope. The experiments have been performed at room temperature on 2 × 1 × 0.2 μm(3) beams prepared by focused ion beam. The specimens are not single crystals despite their small sizes. Orientation mapping indicated that several grains were well oriented for plastic slip. However, no dislocation activity has been observed even though the engineering tensile stress went up to 700 MPa. We show also that antigorite does not exhibit a purely elastic‐brittle behavior since, despite the presence of defects, the specimens accumulate permanent deformation and did not fail within the elastic regime. Instead, we observe that strain localizes at grain boundaries. All observations concur to show that under these experimental conditions, grain boundary sliding is the dominant deformation mechanism. This study sheds a new light on the mechanical properties of antigorite and calls for further studies on the structure and properties of grain boundaries in antigorite and more generally in phyllosilicates. John Wiley and Sons Inc. 2020-03-07 2020-03 /pmc/articles/PMC7375155/ /pubmed/32714729 http://dx.doi.org/10.1029/2019JB018383 Text en ©2020. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Idrissi, Hosni
Samaee, Vahid
Lumbeeck, Gunnar
van der Werf, Thomas
Pardoen, Thomas
Schryvers, Dominique
Cordier, Patrick
In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope
title In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope
title_full In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope
title_fullStr In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope
title_full_unstemmed In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope
title_short In Situ Quantitative Tensile Testing of Antigorite in a Transmission Electron Microscope
title_sort in situ quantitative tensile testing of antigorite in a transmission electron microscope
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7375155/
https://www.ncbi.nlm.nih.gov/pubmed/32714729
http://dx.doi.org/10.1029/2019JB018383
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