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Previous issue date: 2017-08-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / As ligas de alum?nio na composi??o eut?tica apresentam como caracter?stica baixa temperatura
de fus?o e uma microestrutura complexa formada por constituintes eut?ticos. Elas podem ser
aplicadas na ind?stria de fundi??o, por apresentarem adicionalmente alta fluidez e baixa
tend?ncia ? forma??o de porosidade e de trincamento a quente. Foram produzidas por fundi??o
em areia as ligas eut?ticas do sistema Al-Cu (bin?ria), Al-Cu-Si e Al-Cu-Mg (tern?rias) e Al-
Cu-Si-Mg (quatern?ria). As ligas foram analisadas microestruturalmente no estado bruto de
fus?o e no estado ap?s tratamento t?rmico de homogeneiza??o ? 495 ?C por at? 24 horas, via
Fluoresc?ncia de Raios-X (FRX), Difra??o de Raios-X (DRX) e Microscopia Eletr?nica de
Varredura (MEV) com sistema de Energia Dispersiva de Varredura (EDS). Os resultados
mostraram a forma??o das principais fases constituintes no estado de equil?brio termodin?mico,
a forma??o significativa de constituintes eut?ticos e a forma??o em pequena quantidade de
intermet?licos Al5FeSi (plaquetas) e AlFeSiMgCu (escrita chinesa), comumente encontradas
devido ? presen?a intr?nseca do ferro como impureza em ligas de alum?nio. / The aluminum alloys in the eutectic composition have a characteristic low melting temperature
and a complex microstructure formed by eutectic constituents. They can be applied in the
foundry industry, as they additionally present high fluidity and low tendency to the formation
of porosity and hot cracking. The Al-Cu (binary), Al-Cu-Si and Al-Cu-Mg (ternary) and Al-
Cu-Si-Mg (quaternary) systems were produced by sand casting. The alloys were analyzed
microstructurally in the as-cast condition and after homogenizing heat treatment at 495 ? C for
until 24 hours, via x-rays fluorescence (FRX), x-rays diffraction (XRD) and scanning electron
microscopy (SEM) with dispersive scanning energy system (EDS). The results showed the
formation of the main constituent phases in the thermodynamic equilibrium state, the significant
formation of eutectic constituents and the formation of a small amount of intermetallic Al5FeSi
(platelets) and AlFeSiMgCu (chinese writing), commonly found due to the intrinsic presence
of iron as an impurity In aluminum alloys.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24199 |
| Date | 25 August 2017 |
| Creators | Oliveira, Juliano Augusto Medeiros de Menezes e |
| Contributors | 17536268890, Nascimento, Rubens Maribondo do, 80732810400, Silva, Wanderson Santana da, 94086591634, Peres, Maur?cio Mhirdaui |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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