Navegando por Assunto "Aluminum alloys"

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Acesso aberto (Open Access)
Avaliação da resistência elétrica e mecânica da liga de alumínio série 6101 modificada com 0,16%Nb
(Universidade Federal do Pará, 2021-06-28) ALMEIDA, Denyson Teixeira; QUARESMA, José Maria do Vale; http://lattes.cnpq.br/7443111804471290
The requirement for better materials for electrical cables has demanded the need of new, stronger and better conductivity aluminum metal composites. 6xxx series alloys, more specifically 6101 and 6201, have been combined with various chemical elements, heat treated and artificially aged to improve mechanical strength and conductivity. Brazil is the largest producer, exporter and holder of the worldwide niobium deposits. Thus, this metal has a high potential as a very promising alloying element for the target material of this study, when it combined with other metals, makes the material superconducting, has a medium grain refinement effect, an aggregating action to improvement of mechanical strength. In this study it will be proposed to add [0.16]%Nb to the Al-0,05%Cu-[0,24-0,28]%Fe-0,5%Si-0,6%Mg, casting in “U” metal shell evaluating the behavior of the heat resistance according to COPEL protocol (Companhia Paranaense de Energia Elétrica), mechanical, electrical resistance and microstructural characterization.
Acesso aberto (Open Access)
Caracterização da liga 6101 refinada com a adição de diferentes teores de cobre e solidificadas em molde unidirecional horizontal e em molde "U"
(Universidade Federal do Pará, 2007) FEITOSA, Johnyson Pereira; QUARESMA, José Maria do Vale; http://lattes.cnpq.br/7443111804471290
The 6101 alloy (series 6xxx) was modified with addition of 0.05% and 0.3% of copper and with additions of grain refiners as Al-Ti-B. The alloys were thermally characterized (heat transfer coefficient of metal / mold, displacement speed of liquidus isothermal and cooling rate), mechanically (tensile strength and toughness module) and electrically (electric resistivity, specific resistance and power conductivity) using two forms of pouring out: one is horizontal directional solidification and the other into the "U" mold. By horizontal directional solidification was possible characterize the macrostructure, influenced by refiners of grain and by viscosity that copper provides in the metal / mold efficiency of alloys researched, modifying the thermal, mechanical and electrical properties. The solidification in "U" mold makes possible evaluates the mechanical and electrical properties, seeing the forming process variables of alloys, as forming rate, tensile strength, toughness and electric resistivity, power conductivity and electric resistance, using the specimens obtained in several diameters. For the “U” mold were casting more two alloys to evaluation, Al-0,6Mg-0,4Si-0,1Cu and Al-0,6Mg-0,4Si-0,2Cu. The mechanical and electrical properties had been influenced by cold working, copper content and shrinkage void presents into alloys structures.
Acesso aberto (Open Access)
Correlação da coalescência de microcavidades com as propriedades mecânicas e elétricas de fios para Tx e Dx de energia elétrica da liga base Al-0,5%Cu-[0,24-0,28]%Fe modificada com teores de silício
(Universidade Federal do Pará, 2013-07) MONTEIRO, Valmor Capanema Oliveira; QUARESMA, José Maria do Vale; http://lattes.cnpq.br/7443111804471290
In this study, na attempt is made to establish the influence of the concentration [0.5, 0.7 and 0.9]% Si as modifiers of alloys Al-0,05% Cu-[0.24 to 0.28]%Fe, evaluated by aspects that took into account operational parameters such as horizontal unidirectional leaks: Speeds (Vs) and Exchange Solidification (Tx). After cutting and machining cylindrical profiles were obtained with diameters of 9.5mm and length of 120mm, from which, after the cold working operations, were obtained wires with diameters of 2.7, 3.0, 3.8 and 4.0 mm. These profiles were subjected to electrical characterization on the basis of the electrical conductivity, tomechanical characterization based on assays stress/strain, emphasizing elongation [%], and structural characterization longitudinal sections, with emphasis on distribution of second phase particles, and aspect of the fracture, with emphasis on the relationship L/W length (L) and width (W) of the dimples.