· Aleaciones ligeras ·
W. K. Krajewski*1, A. L. Greer**, J. Zych* and J. Buraś*
* AGH University of Science and Technology, Poland, ** University of Cambride, U.K.
67th World Foundry Congress
The presented work is devoted to structural characteristics and performance
of the new family of grain-refiners, based on the Zn-Ti system. The
system studied was Zn-25wt%Al alloy (ZnAl25), Al-20wt%Zn alloy
(AlZn20), Zn-4.6wt%Ti master alloy (ZnTi4 MA), ZnAl-4 wt%Ti (ZnAl-Ti4
MA) as well as the traditional refiners Al-5wt%Ti-1wt%B (AlTi5B1 MA) and
Al-3wt%Ti-0.15wt%C (AlTi3C0.15 MA). SEM (scanning electron microscopy),
LM (light microscopy) and TA (thermal analysis) investigations
showed high effectiveness of the ZnTi-based master alloys as refiners of
the inoculated with them AlZn20 and ZnAl25 alloys. The obtained structure
refinement is comparable to those obtained after addition of the traditional
AlTi5B1 MA or AlTi3C0.15 MA. The initial examinations of the damping
properties showed, that attenuation coefficient of the refined AlZn20 alloy
decreases together with increased structural fineness of the inoculated alloy.
