Page 226 - Fiber Fracture

STRENGTH AND FRACTURE OF METALLIC FILAMENTS 21 1

100

-
90
;
2
-
1" 80
3
-0
0
E
0
'2 70
n
a
60
0.1 1 10 100 1000 10000
Annealing time [SI __+

Fig. 26. Evolution of the elastic modulus of an as-drawn 38 wm diameter Cu wire during annealing. The
initial decrease occurred while the wire was stored during 4 months at room temperature.

0.0 1 0.1 1 10 100 1000 10000
Annealing time [SI _I,

Fig. 27. Evolution of the elastic modulus of an as-drawn 25 wm diameter Au wire during annealing at
different temperatures.

With progressing recrystallization the microstructural rearrangements will reduce the
non-compatibility of the initial plastic deformation and therefore eliminate the source
of residual stresses. Beyond the minimum of Young's modulus, where recrystallization
really starts, the residual stresses may have disappeared and leave the field open for other