516 Prakt. Met. Sonderband 38 (2006) 
time increase to 270 min as shown in Fig. 4(d), the size of the Y211 phase increased 
compare to the sample in (b) and (c). The size increase of the second particles with 
attrition milling time may be due to the higher stress state and high agglomeration of the 
finer powder which may result in faster melt growth during process. Thi 
red 
Wit 
effe 
phe 
the 
tim 
res 
witl 
of 
red 
Bat 
RE 
(c) (d) 
Fig. 4: Optical micrographs of the melt-textured Y123 samples from the mixed precursor [1] 
(a) as calcined, and attrition milled for (b) 30 min, (c) 150 min., and (d) 270 min. 
[2] 
[3] 
[4] 
N DS) 
(a 
(C) (d) 
Fig. 5: High magnification micrographs of the melt-textured Y123 samples shown in Fig. 4. 
a 
x 
Br