The solidification behaviors of highly undercooled Ni-21.4%Si eutectic alloy molten under a slag composed of B2O3 and soda lime glass were investigated and the undercooling for the alloy to nucleate homogenously was predicted theoretically. It is found that a undercooling of 318 K can be achieved in Ni-21.4%Si eutectic alloy by using slag technique. Theoretical calculation shows that the maximum undercooling obtained in Ni-21.4%Si eutectic alloy has reached the homogeneous nucleation undercooling for the alloy. The solidification behavior and structure of undercooled Ni-21.4%Si eutectic alloy depend on the undercooling. When the undercooling is lower than 250 K, there are two recalescence peaks on the cooling curve. The solidified microstructure is composed of primary Ni3Si phase and regular eutectic as the undercooling is lower than 206 K, while primary α-Ni phase and regular eutectic structure are obtained when the undercooling is in the region from 206 K to 250 K. When the undercooling is greater than 250 K, only one recalescence peak is observed in the cooling curve and anomalous eutectic structure is obtained. Undercooling can influence the growth mode of primary Ni3Si. The primary Ni$_{3}$Si transforms from lateral growth to non-lateral growth with increasing the undercooling.
CHANG Fang-E
,
DIAO Zhi-Wei
,
ZHU Man
,
LI Na
,
FANG Wen
,
DONG An-Zhi
,
JIAN Ceng-Yun
. SOLIDIFICATION BEHAVIORS OF HIGHLY UNDERCOOLED Ni-21.4%Si EUTECTIC ALLOY[J]. Acta Metall Sin, 2012
, 48(7)
: 875
-881
.
DOI: 10.3724/SP.J.1037.2012.00006
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