THE EFFECT OF Ti ON HIGH-ZINC Al CAST ALLOYS STRUCTURE AND PROPERTIES
Abstract
The paper comprises investigations of binary Al – 20 wt% Zn sand cast alloy (AlZn20) doped by 0.04 wt% Ti, introduced into melt with the AlTi5B1, AlTi3C0.15 and AlZn-Ti3 MA (master alloy). The LM (Light Microscopy) structural examinations, UTS (Ultimate Tensile Strength) and Elongation (A5) as well as DP (damping properties) tests were performed for the initial, non refined alloy, and for the grain refined ones. On the basis of these examinations it was stated that the implemented inoculation process causes significant increase of grains population. Elongation of the grain refined alloys increases from the range of 1.7 – 2.1 % (initial, non refined samples) to the range of 2.1 – 2.9 % (grain refined samples). At the same time, UTS and attenuation coefficient remain basically preserved.
Keywords: aluminium alloys|grain refining|grain size|heterogeneous nucleation of phase|mechanical properties|
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