Abstract:
Hot tearing susceptibility of Mg–Gd alloys are
investigated using instrumented constrained rod casting
(CRC) apparatus, and found that the susceptibility increases with increase in Gd content, and reaches a maximum at
2 % after which it decreases to a minimum with 10 % Gd.
The high susceptibility observed with 2 % Gd is due to its
columnar structure and low amount of eutectic liquid at the
time of cracking, whereas equiaxed grain and high liquid
content which facilitates crack healing are the reasons for
the low susceptibility of Mg–10 Gd alloy
