High temperature indentation creep tests on anhydrite – a promising first look
Indentation creep tests are established in materials engineering, providing information on rheology, deformation mechanisms, and related microstructures of materials. Here we explore the potential of this method on natural, polycrystalline anhydrite. The tests are run at atmospheric pressure, temper...
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2014-08-01
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Online Access: | http://www.solid-earth.net/5/805/2014/se-5-805-2014.pdf |
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doaj-944330172c5f4e61bb4097d57c5ff8e12020-11-25T02:31:27ZengCopernicus PublicationsSolid Earth1869-95101869-95292014-08-015280581910.5194/se-5-805-2014High temperature indentation creep tests on anhydrite – a promising first lookD. Dorner0K. Röller1B. Stöckhert2Institute of Geology, Mineralogy and Geophysics, Ruhr University, Bochum, GermanyInstitute of Geology, Mineralogy and Geophysics, Ruhr University, Bochum, GermanyInstitute of Geology, Mineralogy and Geophysics, Ruhr University, Bochum, GermanyIndentation creep tests are established in materials engineering, providing information on rheology, deformation mechanisms, and related microstructures of materials. Here we explore the potential of this method on natural, polycrystalline anhydrite. The tests are run at atmospheric pressure, temperatures between 700 and 920 °C, and reference stresses between 7 and 30 MPa. An activation energy <i>Q</i> of 338 kJ mol<sup>−1</sup> and a stress exponent <i>n</i> of 3.9 are derived. Deformation is localized into shear zones bounding a less deformed approximately conical plug underneath the indenter. Shear zone microstructures reveal inhomogeneous crystal–plastic deformation, subgrains, and extensive strain-induced grain boundary migration, while mechanical twinning appears not to be activated. Microstructure and mechanical data are consistent with deformation by dislocation creep.http://www.solid-earth.net/5/805/2014/se-5-805-2014.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. Dorner K. Röller B. Stöckhert |
spellingShingle |
D. Dorner K. Röller B. Stöckhert High temperature indentation creep tests on anhydrite – a promising first look Solid Earth |
author_facet |
D. Dorner K. Röller B. Stöckhert |
author_sort |
D. Dorner |
title |
High temperature indentation creep tests on anhydrite – a promising first look |
title_short |
High temperature indentation creep tests on anhydrite – a promising first look |
title_full |
High temperature indentation creep tests on anhydrite – a promising first look |
title_fullStr |
High temperature indentation creep tests on anhydrite – a promising first look |
title_full_unstemmed |
High temperature indentation creep tests on anhydrite – a promising first look |
title_sort |
high temperature indentation creep tests on anhydrite – a promising first look |
publisher |
Copernicus Publications |
series |
Solid Earth |
issn |
1869-9510 1869-9529 |
publishDate |
2014-08-01 |
description |
Indentation creep tests are established in materials engineering, providing
information on rheology, deformation mechanisms, and related microstructures
of materials. Here we explore the potential of this method on natural,
polycrystalline anhydrite. The tests are run at atmospheric pressure,
temperatures between 700 and 920 °C, and reference stresses between
7 and 30 MPa. An activation energy <i>Q</i> of 338 kJ mol<sup>−1</sup> and a stress
exponent <i>n</i> of 3.9 are derived. Deformation is localized into shear zones
bounding a less deformed approximately conical plug underneath the indenter.
Shear zone microstructures reveal inhomogeneous crystal–plastic deformation,
subgrains, and extensive strain-induced grain boundary migration, while
mechanical twinning appears not to be activated. Microstructure and
mechanical data are consistent with deformation by dislocation creep. |
url |
http://www.solid-earth.net/5/805/2014/se-5-805-2014.pdf |
work_keys_str_mv |
AT ddorner hightemperatureindentationcreeptestsonanhydritendashapromisingfirstlook AT kroller hightemperatureindentationcreeptestsonanhydritendashapromisingfirstlook AT bstockhert hightemperatureindentationcreeptestsonanhydritendashapromisingfirstlook |
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1724824471447011328 |