Amplitude Dependent Internal Friction of Magnesium Alloy AZ31 at Room Temperature

Abstract:

The aim of this work is to study the Amplitude Dependent Internal Friction (ADIF) of magnesium alloy AZ31 at room temperature at the frequency 20kHz. The internal friction of AZ31 at room temperature is mostly influenced by mechanical cycling at strain amplitudes in the microplastic deformation region. An excited state of the AZ31 alloy, which can be associated with a higher internal friction and lower dynamic modulus than usual state, was found immediately after mechanical cycling. When the strain amplitude drops, the diffusion of solute atoms restores the Zener atmosphere and the internal friction relaxes exponentially with the second root of time. The measurement methodology and obtained results are presented.

• Periodical: Solid State Phenomena (Volume 184)
• Pages: 179-184
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.184.179
• Online since: January 2012
• Authors: D. Blažek, Peter Palček, Zuzanka Trojanová, Jakub Porubčan
• Keywords: Amplitude Dependent Damping, Dislocation Depinning, Magnesium Alloy AZ31, Microplastic Deformation

References

[1] Z. Trojanová, Z. Száraz, P. Palček, M. Chalupová, Magnesium alloys based composites, in: Magnesium Alloys – Design, Processing and Properties, Ed.: F. Czerwinski, InTech Rijeka (2011), 501-526.

DOI: 10.5772/67028

[2] D. Blažek, P. Palček, M. Kasenčák, J. Porubčan, The internal damping of depinned dislocations in Mg AZ31 alloy, in: 27th Danubia-Adria symposium on advances in experimental mechanics, Wrocław University of Technology, (2010), pp.9-10.

[3] M. Kasenčák, P. Palček, D. Blažek, The temperature dependence of internal damping and elastic modulus of Mg alloy, in: International journal of applied mechanics and engineering. Vol. 15, no. 2, (2010) 329-333.

[4] A. Mielczarek, H. Fischer, W. Riehemann, Amplitude dependent damping of PSZ with sinter defects, Mat. Sci. Eng. A442 (2006) 488-491.

DOI: 10.1016/j.msea.2005.12.091

[5] M. S. Blantner, I.S. Golovin, H. Neuhäuser, H.R. Sinning, Internal Friction in Metallic Materials, Springer (2007).