Artículos de revistas
Evolution of Eutectic Spacing During Unidirectional Solidification of Al-Ni Alloys
Registro en:
Materials Research-ibero-american Journal Of Materials. Univ Fed Sao Carlos, Dept Engenharia Materials, v. 14, n. 2, n. 268, n. 273, 2011.
1516-1439
WOS:000292723200021
10.1590/S1516-14392011005000034
Autor
Araujo, IJC
da Silva, BL
Spinelli, JE
Garcia, A
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 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. 14 2 268 273 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) FAEPEX - UNICAMP Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)