FIG.4 - Al-UAl, eutectic. FIG.5 - Al-17 wt%Th Hypoeutectic 
Al1-19 wt23U.Etch:HF.1250X.. alloy.Etch:HF. 1750X. 
FIG.6 - Al1-28,9 wt3Th. Etch:HF. 100% 
hina.800X, 
g = 
> LE 
Cr N “ 
REE. IE TAG „m 
(a) (b) 
FIGS.7 - a) The complex regular morphology of Fig.6. 750X 
b) ThAl,; in the complex regular spiral morphology.SEM.5000X. 
Prakt. Met. Sonderbd. 21 (1990) 
2173