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Activation parameters for deformation of ultrafine-grained aluminium as determined by indentation strain rate jumps at elevated temperature

Wheeler, J. M. and Maier, V. and Durst, K. and Göken, M. and Michler, J. (2013):
Activation parameters for deformation of ultrafine-grained aluminium as determined by indentation strain rate jumps at elevated temperature.
In: Materials Science and Engineering: A, Elsevier Science Publishing, pp. 108-113, 585, ISSN 09215093,
[Online-Edition: http://dx.doi.org/10.1016/j.msea.2013.07.033],
[Article]

Abstract

The hardness and strain rate sensitivity of ultrafine-grained (UFG) aluminium was examined as a function of temperature using in situ strain rate jump indentation in a SEM at temperatures up to 250 °C. Measured strain rate sensitivities were in good agreement with earlier bulk compression measurements. Activation energies and volumes for deformation were extracted and discussed. Transitions in the deformation mechanism are observed at lower temperatures for smaller grain sizes.

Item Type: Article
Erschienen: 2013
Creators: Wheeler, J. M. and Maier, V. and Durst, K. and Göken, M. and Michler, J.
Title: Activation parameters for deformation of ultrafine-grained aluminium as determined by indentation strain rate jumps at elevated temperature
Language: English
Abstract:

The hardness and strain rate sensitivity of ultrafine-grained (UFG) aluminium was examined as a function of temperature using in situ strain rate jump indentation in a SEM at temperatures up to 250 °C. Measured strain rate sensitivities were in good agreement with earlier bulk compression measurements. Activation energies and volumes for deformation were extracted and discussed. Transitions in the deformation mechanism are observed at lower temperatures for smaller grain sizes.

Journal or Publication Title: Materials Science and Engineering: A
Volume: 585
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Indentation, Scanning electron microscopy (SEM), Ultrafine-grained metals, High temperature deformation
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Dec 2014 13:40
Official URL: http://dx.doi.org/10.1016/j.msea.2013.07.033
Identification Number: doi:10.1016/j.msea.2013.07.033
Funders: Financial support was provided by the German Research Council (DFG), which, within the framework of its ‘Excellence Initiative' supports the Cluster of Excellence “Engineering of Advanced Materials”.
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