Prakt. Met. Sonderband 46 (2014) 251 
where the growth rate is controlled by the volume diffusion of oxygen. Simultaneously with 
the growth of 10Z the growth of grains and annihilation of defects take place before IOF 
therefore the effects of deformation after longer annealing times (60 min, 300 min) 
disappear. The growth rate of IOZ is controlled by diffusion of oxygen through the volume 
of the grains. The consequence of this is small difference in the depth of 10Z after longer 
annealing times in the samples, which were subjected to the ECAP process and the non- 
deformed samples. The results show that the prior deformation would not allow to achieve 
greater depths of I0Z after longer annealing times. 
340 
330 
320 
no 
Bio 
8 i ~~ ndeformed sampl 
g io ~~ 1 ECAP pass 
S ow 4 ECAP pass 
ned sample. A 
:M image of 9 
the degree of N 
mth increases 0 © pa die 
he ECAP-ed D 30 60 90 120 150 180 210 240 270 300 330 
ple. At longer min 
the same in 
1e IOZ at the 
total depth of Figure 3: IOZ depth as a function of annealing time and the degree of deformation at the 
temperature of the internal oxidation of 1173K. 
composed of 
ther than the a. _ _ 
‘). At higher Large grains {OF 
s (Figure 4b). CT 
tures where a ~ ~ 
/olume of the «© 4 
5, resulting in _ i" —_— 
1s with a high lo i / N 
ion of oxygen YY TF a 
5b). Because I Dissolution of [Q] 
e diffusion of 
s along grain 
oy the rate of 
ter annealing Figure 4: Kinetics of internal oxidation in the microstructure with large grains (non- 
on-deformed. deformed sample); (a) high annealing temperature (b) low annealing temperature 
(a (hb