(a) {b) . 
FIGS.8 - a) Al-26,6 wt%Th Hypereutectic alloy. Etch:HF. 100 X. 
b) ThAl, proeutectic in the same alloy. SEM. 700 X. 
md 
A } UAT, ’ UAT, 
That ThA13 
FIG.9 - Coupled Zone in the Systems Al-ThAl; and Al1-UAl.. a)Eutectic a 
composition. b) Hypereutectic alloy and formation of 
proeutectic UAl, or ThAl,. 
© Bl : 
FIG.10 - Al-11 wt%U Hypoeutectic alloy. Transverse section. R=40mm/h 
Etch:HF. 125 X. 
Prakt. Met. Sonderbd. 21 (1990) 
a’ o 
2914