The optimum concentration for Sr addition to modify the Sieutectic is 0.04 wt% [15]. However, the effect of higher Sr con-tent was also evaluated. The effects of Bi additions on the coolingcurves of alloys modified with 0.06 wt% Sr is as shown in Fig. 9a.It is seen that further addition of Bi increases the eutectic reactiontemperature especially the growth temperature. TGwas measured