Prakt. Met. Sonderband 38 (2006) 47
mal” large 4c). Eventually, a clustering of such structures occurs with increasing strain. Thus
aries. The recrystallization, if not disrupted, would have possibly progressed preferentially at these
5 resulting sites [5].
| of these
Jue to the
Fig. 4: EBSD measurements: Grain maps of the deformed fraction at a strain of 0.3, with
the bold black dots marking small angle misorientations of 2° (Figs. a and c) and 1° (Fig. b)
in the range between 1°-5°. Fig. c is a section of Fig. a, with the arrows marking regions
with small angle grain boundaries. The white areas represent the recrystallized fraction.
Image width of Figs. a and b: 809 um, of Fig. ¢: 215 um.
The analysis of the EBSD-data of the different strained specimens results in a nearly linear
increase of the recrystallized fraction dependent on the strain (Fig. 5a). The recrystallized
grains are strongly twinned, therefore there is a strong dependence of the calculated
average grain size on the comprehension of the twins (see Fig. 5b). If no twins are
removed only a slight increase of the grain size can be observed whereas a pronounced
growth of the recrystallized grains follows the removing of all twins. The removal of
coherent and all twins (coherent and incoherent) was carried out with a procedure
implemented in the OIM software 4.5 and is based on an algorithm introduced by Wright
and Larsen [14].
LO ee
0.9 Ta irae 30 ] I a
0.8 A 25 | ‘ aed
0.74 E eel
0.6 - ‚204 A
0.5 - Si X RE
499 0.4 - =
on as 034 8 10 ~—®—.notwins removed. ..... ...
x i] = op —-8— coherent twins removed
nent De p SGI tins Temoved
GY — 0+ = my —
0.1 0.3 0.5 0.7 0.9 0.1 0.3 0.5 0.7 0.9
boundaries strain strain
ny grains . . ; ; ;
rientation Fig. 5: a) Recrystallized fraction as a function of strain b) Average diameter of the
whereas recrystallized grains as a function of the strain and in dependence of twin handling
he whole
ns), their
38. 3.2 METADYNAMIC AND STATIC RECRYSTALLIZATION
aries can a lls . .
sizes of Once DRX has been initiated, it is followed by a combination of conventional metadynamic
vs in Fig. recrystallization and static recrystallization, their fractions depending on the degree of