As shown in Fig. 2, the fluidity of all samples increased with
increasing temperature. The trend of increasing fluidity after addition of 0.2 wt.% Sc, 0.4 wt.% Sc, and 0.2 wt.% Sc with 0.2 wt.% Zr is especially obvious at higher temperatures, i.e., 690 and 720 ◦C. The
increase in fluidity was not as significant at the lower temperature
(660 ◦C). The A356 with no Sc and Zr addition had the lowest fluidity.
Adding 0.2 wt.% Zr with 0.2 wt.% Sc did not significantly increase
the fluidity compared to A356 + 0.2Sc and A356 + 0.4Sc samples.