The subject of this study is the presentation of relation between the degree of structure fineness and ultrasonic wave damping coefficient for the high-zinc aluminium alloys represented in this study by the sand mould cast alloy Al - 20 wt% Zn (AlZn20). The studied alloy was refined with a modifying (Al,Zn)-Ti3 ternary master alloy, introducing Ti in the amount of 400 pm into metal. Based on the analysis of the initial and modified alloy macrostructure images and ultrasonic testing, it was found that the addition of (Al,Zn)-Ti3 master alloy, alongside a significant fragmentation of grains, does not reduce the coefficient of ultrasonic waves with a frequency of 1 MHz.
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 Krajewski, W.K., Buras, J., Piwowarski, G., Haberl, K. & Tsivoulas, D. (2011). DSC and TA characteristics of the inoculated Al-Zn20 alloy. Archives of Foundry Engineering, vol. 11, issue 1, pp. 65-68.
 Krajewski, W.K. & Haberl, K. (2011). The effect of Ti on High-Zinc Al cast alloys structure and properties. ActaMetallurgica Slovaca, vol. 17, issue 2, pp. 123-128.
 Buras, J. (2011). The influence of grain refinement on damping properties of selected aluminium zinc cast alloys. PhD thesis supervised by W.K. Krajewski, AGH University of Science and Technology - Faculty of Foundry Engineering, Krakow 2011 (in Polish).