Eutectics
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Effect of Welding Parameters on Nanostructured Fe-(C, B)-(Cr, Nb) Alloys
New nanostructured Fe-(Nb,Cr)-(C,B) multicomponent alloys have been developed for hardfacing application. They have better wear resistance than traditional Fe-Cr-C alloys. The nano-alpha-Fe, eutectic and hard carboborides phases of the weld metal usually show variations with the welding procedure. 6 test samples with different heat input were welded. It was
Mat. Res.. Publicado em: 20/01/2020
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2. Effects of Macrosegregation and Microstructure on the Corrosion Resistance and Hardness of a Directionally Solidified Zn-5.0wt.%Mg Alloy
This study aims to analyze the influence of macrosegregation on microstructure evolution, and of microstructure length scale on the corrosion resistance of a Zn-5.0wt.%Mg alloy casting. The analyzed samples were taken along the length of castings unidirectionally solidified in unsteady state conditions of heat extraction. Microstructure characterization, mic
Mat. Res.. Publicado em: 05/09/2019
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3. Morphology and Phase Formation During the Solidification of Al-Cu-Si and Al-Ag-Cu Ternary Eutectic Systems
The microstructure of ternary alloys in the Al rich corner of the Al-Cu-Si and Al-Ag-Cu systems were analyzed in order to determine the solidification path in the different structural regions expected from the equilibrium phase diagram. The analysis was based on theoretical models developed in the literature for solidification of ternary eutectic system allo
Mat. Res.. Publicado em: 26/02/2018
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4. Effects of Solidification Rate in the Microstructure of Al-Si5Cu3 Aluminum Cast Alloy
Aluminium alloy Al-Si5Cu3 (319) is one of the most commonly used casting alloys for automobile components, due to its casting characteristics. Iron is the major impurity element that influences the detrimental β-phase formation in secondary aluminum alloys. In the present study, we investigated the influence of the cooling rate on the formation of iron comp
Mat. Res.. Publicado em: 20/07/2017
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5. Microstructure Observation of Naturally Aged Thixoforming ZA27 Alloy
The microstructure of the thixoformed ZA27 alloy naturally aged for 5 years has been observed and analyzed. The results indicate that most of the original β + η laminar eutectics have changed into the structures that small α particles uniformly distribute in η phase matrix. Both the β phase and α’ phase have also decomposed. It is suggested that a co
Mat. Res.. Publicado em: 24/11/2015
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6. 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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7. Nucleation and growth of austenite/VC eutectic in alloys of the Fe-V-C system. / Nucleação e crescimento do eutético austenita/VC em ligas do sistema Fe-V-C.
The three most commercially important families of alloys for the foundry industry show the formation of faceted/non-faceted eutectics type during solidification: cast irons with graphite (austenite/graphite eutectic), white cast irons (austenite/carbide eutectic) and Al-Si alloys (alfa/silicon eutectic). In the case of white cast irons, the eutectic carbide
Publicado em: 2008
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8. Caracterização de camisas de cilindro em ligas Al-Si hipereutéticas e investigação do comportamento de corrosão em meio de condensado sintético automotivo / Characterization of cylinder liners produced with hypereutectic Al-Si alloys and investigation of corrosion behaviour in synthetic automotive condensed solution
No presente trabalho quatro ligas Al-Si hipereutéticas, três das quais foram produzidas por conformação por \"spray\" e a outra por fundição, foram caracterizadas quanto a textura, dureza, microestrutura e resistência à corrosão em meio de condensado sintético automotivo (CSA). Duas das ligas conformadas por \"spray\" foram retiradas de camisas de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/03/2006
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9. Desgaste e fadiga térmica de ligas aço matriz + NbC. / Wear and thermal fatigue of matrix steel + NbCalloys.
The concept of ?matrix steel + NbC? was used to cast alloys with the M2 steel matrix (0,5%C ? 2%W ? 3%Mo ? 4,6%Cr ? 1%V) and different volume fractions of niobium carbides. Niobium (2,5 e 5%) and stoichiometric carbon were added to produce NbC carbides and titanium (0,1%) to modify de NbC carbides morphology. NbC presented three basic morphologies: Chinese s
Publicado em: 2006
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10. Obtenção e caracterização de materiais compostos In Situ no sistema Fe-Al-Nb
Eutectic alloys formed by high melting point intermetallics phases, as in the case of the system formed with Fe, Al and Nb elements are promising material to be used as structural materials. This system presents eutectic structures formed by (FeAl)2Nb phase surrounded by (FeAl) solid solution. Depending on solidification conditions the eutectic structures ca
Publicado em: 1998