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(a)


(b)


(c)


(d)


Figure 4. Micrographs of with-CHG (a and c) and no-CHG (b and d) DTA samples after melting at 1200°C, holding for 1800 s and cooling at 10 K/min. Micrographs c and d were taken at the limit between the outer lamellar zone and the inner undercooled area.


Figure 5. Micrographs of (a) the with-CHG and (b) no-CHG DTA samples after cooling at 2.5 K/min. (a)


(b) 38 International Journal of Metalcasting/Winter 2012


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