Ram "ing . 
4 A 
EEE Jo m bana pana 
sald | 
ioe BE s >a = 
j A fs a. 
Fig.7: X-ray diffraction patterns recorded with Cu radiation for the Al-4wt% Ni. 
a. as cast, b. as melt-spun fibers. (A Al3Ni; m Al 
The high Ni alloys have been rapidly solidified by the melt extraction method. When 
normally cast in conditions of slow cooling the Al-Ni alloys having a Ni content of 10.3 up to 
28.2wt % Ni consist of primary dendrites of AlNi compound and of the (Al + Al3Ni) eutectic 
mixture — fig.8 and fig.10 -. The alloy richer in Ni, namely Al — 31.4wt % Ni has a different 
microstructure ~ fig 12 -. Actually its solidification started by separating the Al;Niz primary 
RS crystals, that later were involved in a peritectic reaction giving rise to the compound Al3Ni 
(composition 
"8 Core 
uted by apphing ; 
2 “rm wide, 0.02- 
asing the cooling 
tie changes in the 
the obtention Of 2 
15 also ascertained 
Ni richest alloy 18 
an intensity ps 
IN ¢ oe 
uo eed) Fig.8: Slowly solidified Al-24.2 Fig.9: Rapidly solidified Al-24.2 
wt% Ni. SEM electron micrograph wt% Ni. SEM electron micrograph 
(composition image x150). (composition image x600). 
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