Damping in AZ31 ECAP-Processed Alloy

Ivleva, Tatiana V.; Göken, J.; Golovin, I.S.; Zúberová, Zuzana; Maikranz-Valentin, Manuel; Steinhoff, Kurt

doi:10.4028/3-908451-53-1.181

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“…However, as the relaxation strength for GBS is much higher than for the dislocation slip [20], and as the non-basal slip systems in hcp alloys are relatively rigid, it is plausible that the internal friction in finely grained AZ31 is dominantly given by GBS. Ileva et al [21] reported a rapid increase of internal friction of ECAPed AZ31 upon heating above the room temperature and have shown that this increase can be indeed attributed to GBS. Similar results were obtained by Watanabe et al [12] who, in addition, observed the dependence of this increase on the grain size by comparing internal friction results for two different rolled plates and for the as-cast material.…”

Section: Introductionmentioning

confidence: 97%

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

et al. 2014

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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 (J100°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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Section: Introductionmentioning

confidence: 97%