Copper Alloys
Mostrando 25-36 de 59 artigos, teses e dissertações.
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25. New Zr-based glass-forming alloys containing Gd and Sm
The effect of minor additions of Gd and Sm on the glass-forming ability (GFA) of Cu-Zr-Al alloys is investigated here. The rationale for these additions is the fact that the atomic size distribution can increase GFA by changing the topology of the alloy as a function of cluster stability, which is tied to the electronegativity and ionic and covalent nature o
Mat. Res.. Publicado em: 09/08/2012
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26. Microstructural characterization of as-cast hf-b alloys
An accurate knowledge of several metal-boron phase diagrams is important to evaluation of higher order systems such as metal-silicon-boron ternaries. The refinement and reassessment of phase diagram data is a continuous work, thus the reevaluation of metal-boron systems provides the possibility to confirm previous data from an investigation using higher puri
Materials Research. Publicado em: 14/02/2012
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27. Fabrication and corrosion resistance of Mg-Zn-Y-based nano-quasicrystals alloys
A wedge-shaped copper mold was used to fabricate micro quasicrystals(QCs). Stable Mg-Zn-Y-based nano-QCs were directly synthesized through this simple route instead of crystallization from metallic glasses or complicated forming processes at high temperature. The study showed that on the tips of the wedge-shaped ingots, the minimum diameter of nano-QCs appro
Materials Research. Publicado em: 31/01/2012
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28. Tendência de formação de fase amorfa em ligas a base de magnésio para biomaterial temporário / Evaluation of the glass forming ability in mg-zn-ca alloys for biomedical application
Mg alloys have attracted attention as potential implant material because of their good mechanical properties, biocompatibility and biodegradation properties. However corrosion of these alloys causes intense release of hydrogen gas which is not desirable for biomedical applications. Zberg et. al. reported a significant reduction in hydrogen evolution in Mg-Zn
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/10/2011
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29. Estudo do comportamento mecânico da liga alumínio cobre 2024 solubilizada e envelhecida para aplicações aeronáuticas
Aluminum alloys present low specific density, good strength, and high corrosion resistance under common environments. Aluminum-Copper 2024 alloy is one of the most widely used alloy in aircraft fuselage structures due to its good mechanical properties. The microstructure of the alloy was observed by optical microscopy showing elongated grains caused from the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/08/2011
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30. Obtenção de fios em ligas cobre-magnésio para utilização em linhas de transmissão de energia elétrica / Obtention of copper-magnesium alloys wires used in eletrical transmission lines
O objetivo desse trabalho foi o de obter-se fios de cobre em três composições químicas distintas da liga Cu-Mg a partir de cobre eletrolítico e de magnésio. Foram avaliadas as etapas envolvidas, começando com a fusão de botões em forno a arco na composição do eutético Cu-Mg, diluição destes botões em forno resistivo, vazamento em lingoteira de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2010
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31. Avaliação da tixoconformabilidade das ligas AA 2011 e AA 2014 / Avaliation of the thixoconformability of AA 2011 and AA 2014 alloys
A tixoconformação é uma técnica de processamento de materiais no estado semi-sólido que permite a produção de peças com geometrias near net shape com melhores propriedades mecânicas e com razoável redução no custo final de produção, se comparados aos métodos de fundição e conformação plástica tradicionais. Dentro das várias possibilidade
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/07/2010
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32. Processing and characterization of Ti-Cu-Ni-Zr and Ti-Fe-Co-Zr glass former alloys / Processamento e caracterização de ligas amorfizáveis TiCuNiZr e TiFeCoZr
Searching the development of bulk metallic glasses the research takes two directions, the development of alloys with a high glass forming ability and development of new processes or improving existing processes. In this context, the present study aimed at to evaluate the solidification processes suction and centrifugal casting, both using copper moulds. The
Publicado em: 2010
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33. Tratamento de envelhecimento artificial das ligas 356 e a 356: efeitos da composição química, do tempo e da temperatura nas propriedades mecânicas / Artificial aging heat treatment of 356 and A356 aluminum alloy: effect of chemical composition, time and temperature on the mechanical properties
This study evaluates the effect of chemical composition and heat treatment of aging on the mechanical properties of aluminum alloy 356. The variables of heat treatment were the magnesium content, time and temperature. Additionally, the effect of alloying elements present as Fe and Mn were also evaluated by comparing with the A356 which is the purest version
Publicado em: 2010
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34. Influence of cathodic current density and mechanical stirring on the electrodeposition of Cu-Co alloys in citrate bath
Cathodic polarization curves of Cu-Co alloys were galvanostatically obtained on a platinum net, using electrolytes containing copper and cobalt sulfates, sodium citrate and boric acid (pH values ranging from 4.88 to 6.00), with different mechanical stirring conditions. In order to evaluate quantitatively the influence of the applied current density and the m
Materials Research. Publicado em: 2008-03
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35. Estudo espectroeletroquímico e eletroanalítico de banhos de eletrodeposição de ligas prata-cobre e pratazinco e caracterização morfológica, química e estrutural dos filmes / Electroanalytical and spectroelectrochemical study of electrodeposition baths of silver-copper and silver-zinc alloys and morphological, chemical, and structural characterization of the films
The purpose of this thesis was to establish the conditions for silver-copper and silver-zinc electrodeposition from ammonium hydroxide and thiourea solutions, respectively, and to investigate the effect of added EDTA and HEDTA on the electrodeposition process. In this way, the influence of solution composition and electrodeposition parameter (deposition pote
Publicado em: 2008
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36. Fabricação e caracterização de termopares Cu/CuNixPy obtidos por deposição eletroquímica. / Fabrication and characterization of Cu/CuNixPy thermocouples obtained by electroless deposition.
In this work, it was studied chemical depositions of CuNixPy alloys and it was fabricated Cu/CuNixPy thermocouples onto silicon wafer surfaces. Initially, surfaces were pre-activated in a diluted hydrofluoric acid solution containing PdCl2. Following, it was used a de-ionizedwater- diluted alkaline chemical bath containing 15 g/l NiSO4.6H2O; 0,1-0,3 g/l CuSO
Publicado em: 2008