Issue 14

M.

Merlin, Frattura

ed Integrità Str

utturale, 14 (20

10) 64-74; DOI

: 10.3221/IGF-ES

IS.14.07

SE Sca SE frac film of

M analysis nning electro M analysis o ture surface in the last s Fig. 8.

n microscop f a hot tear of alloys con tages of solid

y has been u reveals its ty taining signi ification, wh

sed to invest pical intercry ficant amoun ich covers a

igate the hot stalline path ts of copper t least part of

tear surface , which is th is typically s the surface;

fractography e result of i mooth due t an example

. As can be s nterdendritic o the presen is depicted in

een in Fig. 7, separation. ce of an eute the microgr

the The ctic aph

Figure

7 : Hot tear at sample draw

low magnifica n from A.2.1.1

tion in a .

Fig

ure 8 : Fractu

re surface of a

sample drawn

from C.1.2.1 .

Pre in F Fe inte

cipitates of s ig. 9 for a s Si platelet. T rdendritic cr

econdary ph ample drawn he presence acks.

ases have bee from the ho of these seco

n found on t spot in the nd phase pl

the fracture s C.3.2.1 bar. atelets can co

urfaces of th EDS analysis ntribute to

e samples an has revealed limit the flow

alysed. An e the presenc of the eute

xample is sho e of a brittle ctic liquid in

wn Al- the

Figure 9 : SEM

micrograph

of a Al-Fe-Si p

latelet with E

DS spectrum.

Sev wit less are It i beh wo res geo

eral solid br h Alloy A. T alloyed mat reported in F s important t aviour of bi rk, no signs earch, Alloy metrical feat

idges have b he fraction o erials [26]. M ig. 10 and F o compare th llets cast fro of hot tears A that con ures of the C

een found o f bridged gra icrographs o ig. 11, respec e results her m Al-Cu allo in alloys that tains 4.8wt.% outure-Edw

n the hot tea in boundarie f fractured b tively. e obtained wi ys with diffe contained m copper is ards pattern

rs surfaces, s depends m ridges observ th those sho rent copper ore than 4w very suscept used to test

in particular ostly on the ed in sample wn by Suyitn concentratio t.% copper h ible to hot the hot teari

in samples d alloying cont s taken from o et al. in [27 ns and prod ave been fo tearing and ng behaviour

rawn from c ent and tend the A.2.2.3 ], who studie uced by DC und. On the this is prob . For higher

astings obtai s to be greate and A.3.1.1 d the hot tea casting. In t contrary, in ably due to copper cont

ned r in bars ring heir this the ents

70