Evolution of eutectic spacing during unidirectional solidification of Al-Ni alloys
| Autor: | Bismarck Luiz Silva, Amauri Garcia, José E. Spinelli, Igor Jefferson Cabral Araujo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
unidirectional solidification
Materials science Mechanical Engineering Alloy Metallurgy Intermetallic engineering.material Condensed Matter Physics eutectics Al-Ni alloys Mechanics of Materials Phase (matter) Metallography engineering lcsh:TA401-492 General Materials Science Interphase lcsh:Materials of engineering and construction. Mechanics of materials Tip growth Composite material interphase spacing Directional solidification Eutectic system |
| Zdroj: | Materials Research v.14 n.2 2011 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Vol 14, Iss 2, Pp 268-273 (2011) Materials Research, Volume: 14, Issue: 2, Pages: 268-273, Published: 27 MAY 2011 |
| Popis: | Hypoeutectic Al-Ni alloys show a ductile phase α distributed with a β phase Al3Ni fragile where β serves as reinforcement of the structure of the material. The eutectic composition alloys obey the relationship: λ2.v = C, where λ 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 λ 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 λ = 1.2 v-0, 5 illustrates the evolution of the interphase spacing for any examined alloy. |
| Databáze: | OpenAIRE |
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