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|Type:||Artigo de periódico|
|Title:||Evolution of Eutectic Spacing During Unidirectional Solidification of Al-Ni Alloys|
da Silva, BL
|Abstract:||Hypoeutectic Al-Ni alloys show a ductile phase alpha distributed with a beta phase Al3Ni fragile where beta serves as reinforcement of the structure of the material. The eutectic composition alloys obey the relationship: lambda(2).v = C, where lambda 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 lambda 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 lambda = 1.2 v(-0.5) illustrates the evolution of the interphase spacing for any examined alloy.|
|Editor:||Univ Fed Sao Carlos, Dept Engenharia Materials|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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