Abstract:
Influence of Zn content (0, 0.5, 1.5, 4 and 6
wt%) on the hot tearing characteristics of Mg–2 wt% Ca
alloy was investigated. The constrained rod casting (CRC)
apparatus equipped with a load cell and data acquisition
system was used. The initiation of hot tearing was monitored
during solidification. The effect of mould temperatures
(250 and 450 C) on the hot tearing was also
investigated. The formed tears were evaluated using X-ray
tomography and the tear volumes were measured. Results
show that hot tearing susceptibility (HTS) of Mg–2Ca–xZn
(x = 0, 0.5, 1.5, 4 and 6 wt%) alloys increases with
increase in Zn content up to 1.5 wt%, then decreases with
further increase in the Zn content to 6 wt%. Higher initial
