%0 Journal Article
%T Evolution of eutectic spacing during unidirectional solidification of Al-Ni alloys
%A Araujo
%A Igor Jefferson Cabral
%A Silva
%A Bismarck Luiz da
%A Spinelli
%A Jos¨¦ Eduardo
%A Garcia
%A Amauri
%J Materials Research
%D 2011
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%R 10.1590/S1516-14392011005000034
%X hypoeutectic al-ni alloys show a ductile phase ¦Á distributed with a ¦Â phase al3ni fragile where ¦Â serves as reinforcement of the structure of the material. the eutectic composition alloys obey the relationship: ¦Ë2.v = c, where ¦Ë is the eutectic spacing, v is a tip growth rate and c is a constant. the aim of this study is to establish correlations between ¦Ë and v for hypoeutectic al-1%, 3% and 5% ni alloys. unsteady-state upward directional solidification experiments were performed, as well as metallography, dissolution of the aluminum matrix and scanning electron microscopy (sem). the interphase spacing of the three al-ni alloys decreased with increasing tip growth rate, with a predominance of a rod-like morphology on intermetallic. it was observed that parameters such as tip growth rate, cooling rate and temperature gradient decreases as the solidification front advances. it was further observed that a single experimental law ¦Ë = 1.2 v-0, 5 illustrates the evolution of the interphase spacing for any examined alloy.
%K al-ni alloys
%K eutectics
%K unidirectional solidification
%K interphase spacing.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-14392011000200021&lng=en&nrm=iso&tlng=en