Damping in AZ31 ECAP-Processed Alloy

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

doi:10.4028/www.scientific.net/ssp.137.181

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…And the increase of both grain boundary area and the total dislocation density introduced by severe deformation have significant effects on damping of Mg alloys [7][8][9]. Moreover, it is recognized that ECAP offers the potential to induce an unique deformation texture [10,11] which may also influence the damping of Mg alloys.…”

Section: Introductionmentioning

confidence: 98%

Improved mechanical property and internal friction of pure Mg processed by ECAP

Fan

Zheng

et al. 2012

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 98%

Improved mechanical property and internal friction of pure Mg processed by ECAP

Fan

Zheng

et al. 2012

Materials Science and Engineering: A

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“…However, the application of magnesium alloys is restricted to a limited range because of their poor workability at room temperature (RT) which is attributed to their hcp crystal structure. Grain refinement by thermomechanical processing is considered to give magnesium alloys better strength and ductility [3] . Hydrostatic extrusion is a well suited technique for producing fine-grained microstructures.…”

Section: Introductionmentioning

confidence: 99%

Acoustic measurements for determination of the materials damping using a sound source localisation system

Göken

Swiostek²,

Hurdelbrink

et al. 2013

ACTA METALL SIN

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Noise measurements are especially a problem when the object under investigation is largely dimensioned and can only be measured from the distance. To obtain information about the location of noise generation, a measurement technique which makes sound visible in order to introduce further specific technical measures is advantageous. The question is if the time dependence of the signal got from such a non touching and non destructive acoustic method has the potential to calculate the materials damping from. Using a small sound source localization system (Microflown TM probe), specimens of magnesium alloys with different grain sizes obtained by hydrostatic extrusion were investigated. It has been demonstrated that the fine grained microstructure led to a lower damping and its dependence on the strain was reduced. In this context, acoustic measurements by a sound source localisation system which makes materials characterization possible could be used as a quality tool to detect changes in highly stressed components. This approach allows to promote a selective substitution of conventional materials by more innovative ones. The offshore sector is considered to be a field of application: Wind turbines produce noise emission which stems mainly from turbulences at the tips of the rotor blades and vibrations of components inside the nacelle (e.g. gearbox, generator, • • •). If the vibration amplitudes are too high, microcracks of components can lead to failure over the long term. The monitoring of microstructural changes using a larger type of a sound source localisation system is considered as an innovative technical approach with respect to maintenance activities.

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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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Damping in AZ31 ECAP-Processed Alloy

Cited by 6 publications

References 15 publications

Improved mechanical property and internal friction of pure Mg processed by ECAP

Improved mechanical property and internal friction of pure Mg processed by ECAP

Acoustic measurements for determination of the materials damping using a sound source localisation system

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

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