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