Paper Titles
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Developing a Model for Grain Refinement in Equal-Channel Angular Pressing
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The Positive Role of Back-Pressure in Equal Channel Angular Extrusion
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On the Grain Refinement Mechanisms in SPD – Applying High Resolution Electron Microscopy and the LEDS Approach
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Deformation Induced Vacancies with Severe Plastic Deformation: Measurements and Modelling
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Local Investigations of the Mechanical Properties of Ultrafine Grained Metals by Nanoindentations

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Abstract:

The mechanical properties of ultrafine-grained metals processed by equal channel angular pressing is investigated by nanoindentations in comparison with measurements on nanocrystalline nickel with a grain size between 20 and 400 nm produced by pulsed electrodeposition. Besides hardness and Young’s modulus measurements, the nanoindentation method allows also controlled experiments on the strain rate sensitivity, which are discussed in detail in this paper. Nanoindentation measurements can be performed at indentation strain rates between 10-3 s-1 and 0.1 s-1. Nanocrystalline and ultrafine-grained fcc metals as Al and Ni show a significant strain rate sensitivity at room temperature in comparison with conventional grain sized materials. In ultrafine-grained bcc Fe the strain rate sensitivity does not change significantly after severe plastic deformation. Inelastic effects are found during repeated unloading-loading experiments in nanoindentations.

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Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

31-36

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.31

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Online since:

January 2006

Authors:

Johannes Mueller, Karsten Durst, Dorothea Amberger, Matthias Göken

Keywords:

Nanocrystalline Metals, Nanoindentation, Pulsed Electrodeposition, Strain Rate Sensitivity (SRS), Ultra Fine Grained Metal

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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