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Ultrasound Wave Attenuation of Grain Refined High – Zinc Aluminium Sand-cast Alloys

Krajewski W. K., Buraś J., Krajewski P. K., Piwowarski G.

Archives of Foundry Engineering

2015

Vol. 15, iss. 2

51--54

The paper presents results of measuring attenuation coefficient of the Al-20 wt.% Zn alloy (AlZn20) inoculated with different grain refiners. During experiments the melted alloys were doped with Al-Ti3-C0.15 refining master alloy. Basing on measurements performed by Krautkramer USLT2000 device with 1MHz ultrasound wave frequency it was stated that grain refinement reduces the attenuation coefficient by about 20-25%. However, the examined alloys can be still classified as the high-damping ones of attenuation greater than 150 dB/m.

Development of environmentally friendly cast alloys and composites. High zinc Al-base cast alloys

Krajewski W. K., Buras J., Haberl H., Schumacher P.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1 spec.

431--434

This work is devoted to grain refinement of the foundry Al-20 wt% Zn (AlZn20) alloy, aiming at improving ductility of the sand-cast alloy The melted alloy was inoculated using traditional AlTi5B1 (TiBAl) and AlTi3C0.15 (TiCAl) master alloys and newly introduced (Zn,Al)-Ti3 one. The performed structural examinations showed out significant increasing of the grain population of the inoculated alloy and plasticity increase represented by elongation. The high damping properties of the initial alloy, measured using an ultrasonic Olympus Epoch XT device, are basicly preserved after inoculation. Also tensile strength preserves its good values, while elongation shows an increase-which are beneficials of the employed grain-refining process.