Issue 14

M. Me

rlin, Frattura ed

Integrità Struttu

rale, 14 (2010)

64-74; DOI: 10

.3221/IGF-ESIS.

14.07

Figure 4 : Opti

cal micrograph

s showing the

microstructur

e of the eutec

tic mixture an

d the presence

of secondary

phase particles .

(a) : Hot tears in ture is small ce by bridgin solidificatio e identified. on the hot te the hot tear

(b) d and b) total oundaries an ndicates the 6 a) and b) opper conce ructural analy ition of silico

n in C.2.1.3: a) ough to cov ce of fractu ical microgra wn that the 7]. Moreover r with the m

partially heale er the grain b red bridges i phs of Fig. decrease of c , the microst oderate add

ly healed. d to form a c propagation several solid ntration caus sis showed t n in Alloy C

Figure 5 f eutectic mix try to coales last stage of e arms can b olid bridges rovement in

a sample draw and is not en g; the presen n. In the opt It is well-kno ar surfaces [ ing behaviou

If t film hot adj the sign All

he amount o , the grains tears at the acent dendrit fraction of s ificative imp oy B.

ontinuous liq of interdend bridges betw es an increas hat there was with respec

uid ritic een e in no t to

(a) ure 6 : Solid b actured and no

(b) d b) A.3.2.1 b blue, respectiv

ridges in samp -fractured bri

les drawn from dges are depic

a) A.3.1.1 an ted in red and

ars. ely.

Fig Fr

69