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Journal of Materials Science
Erschienen in: Journal of Materials Science 2/2015

01.01.2015 | Original Paper

An ultrasonic internal friction study of ultrafine-grained AZ31 magnesium alloy

verfasst von: Martin Koller, Petr Sedlák, Hanuš Seiner, Martin Ševčík, Michal Landa, Jitka Stráská, Miloš Janeček

Erschienen in: Journal of Materials Science | Ausgabe 2/2015

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Abstract

Internal friction in ultrafine-grained AZ31 magnesium alloy is investigated by resonant ultrasound spectroscopy. It is shown that the internal friction significantly increases at elevated temperatures (\({\gtrsim }100\) °C), and that this increase can be attributed to grain boundary sliding (GBS). The evolution of this phenomenon with grain refinement is studied by comparing the results obtained for an extruded material and for materials after additional one, two, and four passes of equal channel angular pressing. It is observed that the activation energy for diffusive GBS significantly decreases with decreasing grain size, and so does also the threshold temperature above which this internal friction mechanism is dominant. The results prove that the ultrafine-grained AZ31 alloys exhibit diffusive GBS at temperatures close to the ambient temperature, which is an interesting finding with respect to the possible applications of these alloys in superplastic forming technologies.
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Fußnoten
1
Let us point out that in the high-frequency limit the \(Q^{-1}(T)\) does not exhibit any peak behavior common for low-frequency (\({\lesssim}\) 10 Hz) measurements, cf. Fan et al.[22, 23].
 
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Metadaten
Titel
An ultrasonic internal friction study of ultrafine-grained AZ31 magnesium alloy
verfasst von
Martin Koller
Petr Sedlák
Hanuš Seiner
Martin Ševčík
Michal Landa
Jitka Stráská
Miloš Janeček
Publikationsdatum
01.01.2015
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 2/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-014-8641-1

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