Unsteady State Directional Solidification
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Experimental Investigation of Ternary Al-Si-Cu Alloy Solidified with Unsteady-State Heat Flow Conditions
Ternary Al-9.0wt%Si-4.0wt%Cu alloy was solidified in a vertical directional solidification system under unsteady-state heat flow conditions. The resulting dendritic morphology and microsegregation were investigated. A more detailed analysis was dedicated to the microsegregation phenomena where a multielement interaction was observed. The solidification param
Mat. Res.. Publicado em: 12/03/2018
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2. Influence of upward and horizontal growth direction on microstructure and microhardness of an unsteady-state directionally solidified Al-Cu-Si alloy
In order to analyze the effect of the growth direction on dendrite arm spacing (λ1) and microhardness (HV) during horizontal directional solidification (HDS), experiments were carried out with the Al-3wt.%Cu-5.5wt.%Si alloy and the results compared with others from the literature elaborated for upward directional solidification (UDS). For this purpose, a wa
Matéria (Rio J.). Publicado em: 2016-03
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3. The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys
Experiments were conducted to investigate the influence of thermal parameters on the columnar to equiaxed transition during the horizontal unsteady-state directional solidification of Al-Si alloys. The parameters analyzed include the heat transfer coefficients, growth rates, cooling rates, temperature gradients and composition. A combined theoretical and exp
Mat. Res.. Publicado em: 18/02/2014
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4. Characterization of the Al-3wt.%Si alloy in unsteady-state horizontal directional solidification
The main purpose of this paper is to investigate both the columnar to equiaxed transition and primary dendritic arm spacings of Al-3wt.%Si alloy during the horizontal directional solidification. The transient heat transfer coefficient at the metal-mold interface is calculated based on comparisons between the experimental thermal profiles in castings and the
Mat. Res.. Publicado em: 14/05/2013
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5. Transient solidification of alloys of the monotectic AI-Bi, AI-Pb and AI-In systems / Solidificação transitória de ligas dos sistemas monotéticos AI-Bi, AI-Pb e AI-In
Aluminum alloys dispersed with bismuth, lead and indium show promising applications in wearresistant automotive components. Such dispersions of low melting temperature elements decrease hardness and flow easily under sliding conditions, resulting in favorable tribological behavior. Much research has been devoted in order to better comprehend the distinct m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/04/2011
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6. Evolution of eutectic spacing during unidirectional solidification of Al-Ni alloys
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 betwee
Materials Research. Publicado em: 27/05/2011
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7. Transient solidification of hypomonotectic and monotectic A1-Bi alloys / Solidificação transitoria de ligas hipomonotetica e monotetica do sistema A1-Bi
Ligas de alumínio dispersas com bismuto apresentam aplicações promissoras em componentes automotivos resistentes ao desgaste. Essas dispersões de elementos de baixa temperatura de fusão diminuem a dureza e escoam facilmente em condições de deslizamento, resultando em um comportamento tribológico favorável. Muitos estudos têm sido realizados a fim d
Publicado em: 2008
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8. The influence of melt convection on dendritic spacing of downward unsteady-state directionally solidified Sn-Pb alloys
Microstructures are the strategic link between materials processing and materials behavior. A dendritic structure is the most frequently observed pattern of solidified alloys. The microstructural scales of dendrites, such as primary and secondary arm spacings, control the segregation profiles and the formation of secondary phases within interdendritic region
Materials Research. Publicado em: 2006-03
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9. Influencia de parametros termicos de solidificação na transição colunar/equiaxial
The macroestructure of cast ingots can be characterized by either a completely columnar structure or an equiaxed structure, depending on alloy composition and solidification conditions. A more complex structure, typical of solidification in molds of high heat diffusivity, like chill and cooled molds, both structural forms. This mixed mode of solidification o
Publicado em: 2002