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Correlation between strain-rate sensitivity and viscous properties derived from dynamic nanoindentation of ultrafine-grained Al–Zn alloys

Published online by Cambridge University Press:  18 December 2018

Nguyen Q. Chinh ,
Tamás Csanádi ,
Jenő Gubicza  and
Ruslan Z. Valiev
Nguyen Q. Chinh*
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A., Hungary
Tamás Csanádi
Affiliation:
Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353 Košice, Slovak Republic
Jenő Gubicza
Affiliation:
Department of Materials Physics, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter sétány 1/A., Hungary
Ruslan Z. Valiev
Affiliation:
Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx str., Ufa 450000, Russia Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, 28 Universitetsky pr., Peterhof, Saint Petersburg, 198504, Russia
*
Address all correspondence to Nguyen Q. Chinh at chinh@metal.elte.hu
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Abstract

The relationship between the oscillatory force and the depth-response during dynamic indentation was analyzed mathematically and investigated experimentally in ultrafine-grained Al–Zn alloys processed by high-pressure torsion. We have shown for the first time that the phase shift between the local oscillatory force and depth signal, caused by the internal friction, is correlated to the strain-rate sensitivity, which is a key parameter indicating the ductility of materials. This correlation enables a new application of dynamic nanoindentation for studying the rate-dependent deformation-mechanisms of materials from a novel aspect.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 1 , March 2019 , pp. 310 - 314
Copyright
Copyright © Materials Research Society 2018 

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