Crack Paths 2012

during the deformation. It is well known that grain boundary segregation develops

cavities.

250

300

350

400

1,00

V10-3s-1 V10-4s -1

Hf10-3s-1

-1

f 10 -4 s

-1

V 1 0 -5 s

-5

-1

10

s

H

f

0,75

1246800

0,50

0,25

250

300

350

400

12460

Temperature(°C)

Figure 2. tensile stress and failure elongation Vs T at different strain rate

a

b

c

d

e

Figure 3. optical micrographs of polished longitudinal surface of deformed samples at

250°C 10-3s-1 e 10-4s-1(a), 300°C e 10-4s-1(b) 400°C e 10-4s-1(c) showing cavitation

and distribution of crack along grain boundary on 400°C 10-3s-1 (d). S E Mmicrographs

showing cavities close to particles (e)

1124