Prakt. Met. Sonderband 30 (1999) 333 
“ (b) 
Fig. 2: LM picture of macrostructure of the Zn-25wt%Al alloy: 
(a) without Ti addition, (b) with 0.05wt% Ti addition. Magnification 2x. Samples not etched 
550 540 
540 \ ‘ 530 t (b) 
fe s 0 Ct C0 
530 | 
520 1\ 
520 2 
© Too 510 1 | ve 
FE 3 = | 5 
510 © 
500 
500 + 
7 
490 { 490 
| 
4804+— — m um 8 480 | os 
20 40 60 E0 100 20 40 60 80 100 
addon. Time, s Time, Ss 
fagnifce 
Fig. 3: Cooling curves and their first derivatives for initial stage of solidification of the Zn- 
25wt%Al alloy (a) - without Ti addition, (b) - with 0.05wt%Ti addition. Arrows point the tempera- 
ture of nucleation beginning 
a reds 
‚a) 
dT/c 
dT/e