Um estudo comparativo entre chapas produzidas pelos processos de lingotamento contínuo e de lingotamento semicontínuo da liga AA4006: microestrutura e textura cristalográfica

Souza, Fabrício Mendes; Lima, Nelson Batista de; Plaut, Ronald Lesley; Fernandes, Ricardo do Carmo; Padilha, Angelo Fernando

doi:10.1590/s0370-44672012000200009

Cited by 5 publications

(9 citation statements)

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“…Moreover, the electrical conductivity values for the high purity aluminum AA1199 (Table 2) and the AA1050 aluminum are higher than those measured for the AA4006 alloy. Therefore, it may be observed that the electrical conductivity decreases with the increase in the total quantity of solute, following the decreasing order: AA1199 > AA1050 DC ≈ AA1050 TRC > AA4006 DC ≈ AA4006 TRC (Oliveira and Padilha, 2009;Souza et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…From 350 °C onwards the conductivity decreases, reaching the value of 49.0 %IACS at 600 °C. The conductivity increase, with reference to the initial condition, is associated with the solute exit from the solid solution through precipitation, while the conductivity decrease is associated with the increase in solute in solid solution, due to the solution of precipitates (Souza et al, 2012). Therefore, despite the maximum precipitation occurred at about the 350 °C, it was at only at 450 °C that the solution of intermetallic compounds started to predominate.…”

Section: Figurementioning

confidence: 96%

“…Due to its (Fe + Si) content being higher than that for the commercial purity aluminum (AA1050, AA1070, AA1100), the AA4006 alloy presents higher mechanical properties and lower ductility. The number of studies on the AA4006 alloy available in literature (Yeung and Lee, 1998;Souza et al, 2012) is extremely small; only about a dozen publications.…”

Section: Introductionmentioning

confidence: 99%

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Effect of casting mode and thermal treatments on the electrical conductivity of the AA4006 aluminum alloy

et al. 2017

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Initially studied was the effect of the casting mode on the electrical conductivity of AA4006 aluminum alloy sheets produced by both Twin Roll Casting (TRC) and by the semi-continuous Direct Chill (DC) industrial processes, when compared to sheets with commercial purity (AA1050) and high purity aluminum (AA1199). Then, the effects of heat treatments on the electrical conductivity of the AA4006 alloy sheets produced by TRC were also studied. Isochronous and isothermal heat treatments allowed to obtain the precipitation and solution kinetics of the intermetallic compounds. The precipitation kinetics was analyzed with the help of the Johnson-Mehl-Avrami-Kolmogorov equation.

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Section: Resultsmentioning

confidence: 99%

Section: Figurementioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Effect of casting mode and thermal treatments on the electrical conductivity of the AA4006 aluminum alloy

et al. 2017

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“…Souza et al [7] pontua que a principal vantagem do processo (TRC) é a eliminação dos processos de homogeneização e laminação a quente, ou seja, essa rota de produção possui duas etapas a menos. Porém, não possibilita a produção de todas as ligas.…”

Section: Introductionunclassified

Avaliação Da Presença De Soluto Em Folhas De Alumínio

Almeida¹,

Tressia²

2019

TMM

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Folhas de alumínio com espessura inferior a 200 µm são utilizadas em inúmeras aplicações, como na fabricação de diferentes produtos, embalagens descartáveis, aletas de radiadores e blisters que necessitam de boa resistência a corrosão aliada a resistência mecânica. O ferro presente nas ligas de alumínio da série 1xxx e 8xxx, forma nas ligas duas principais fases secundarias Al 3 Fe e α-AlFeSi (dispersóides), alterando a cinética de recristalização, obtendo-se assim excelentes limites de resistência e alongamentos pós recozimento. O silício em conjunto com o ferro forma variações de fases como Ɵ-Al 13 Fe 4 (monoclínica), Al 6 Fe (ortorrômbica), Al 12 Fe 3 Si e Al 3 Fe, sendo controladas na solidificação possibilitando obter excelentes resultados de propriedades mecânicas. O manganês presente nas ligas da série 3xxx forma duas principais fases Al 6 (Mn,Fe) e α-Al 12 (Fe,Mn) 2 Si, porém, na existência do silício se transforma parcialmente em Al 12 (Fe, Mn) 3 Si, sendo muitas propriedades fortemente dependentes do tipo e forma dessas partículas, sendo assim, a obtenção da microestrutura deve ser controlada na solidificação e processos seguintes.

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“…A chapa de alumínio, produzida pelo processo TRC, apresenta uma microestrutura (dendrítica) bastante diferenciada da microestrutura da chapa laminada a quente, no processo DC (MINATEL, 2009), pois há uma maior taxa de resfriamento envolvida durante o processamento da chapa produzida pelo processo TRC do que na chapa produzida pelo processo DC. Dessa forma, no processo TRC, precipitados mais finos podem se formar na superfície, e o posterior tratamento térmico pode causar a precipitação de elementos de liga que ficaram retidos em solução sólida supersaturada (MARTINS;CARVALHO;SOUZA et al, 2011). Por isto, o tratamento térmico de homogeneização pode ser utilizado, a fim de alterar a distribuição dos precipitados.…”

Section: Introductionunclassified

Estudo da microestrutura, da textura cristalográfica e da recristalização em chapas obtidas por lingotamento contínuo e semicontínuo da liga de alumínio AA4006.

Souza¹

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AA4006 Aluminum alloy is extensively used in industry. It belongs to the Al-Fe-Si system, with Si between 0,8 and 1,2 % mass, and Fe between 0,5 and 0,8 % mass. This alloy is less studied despite its extensive use. A comparative microstructural study has been performed in as-received AA4006 alloy strip produced by two industrial casting processes: twin roll caster (TRC) and direct chill (DC). Polarized optical microscopy, scanning electron microscopy with microanalysis, electrical conductivity measurements and Brinnel hardness tests have been used for microstructural characterization. Significant differences in the grain and intermetallic particle sizes, morphologies and distributions were detected and are discussed. Thermal treatments effects on the silicon content in solid solution were also studied. Crystallographic textures have been also determined. Textures across thickness of both sheets have been analyzed and compared. Results showed significant texture changes across thickness of the specimens. Texture analysis was carried out using X-ray diffraction technique. Twin roll caster (TRC) sheet presented the typical shear texture near the surface, while, in internal regions, the β-fibre was observed. A recrystallization study of cold rolled metallic sheets is very important to obtain softening temperature for the material during annealing. After cold rolling with 70% of reduction in thickness, followed by isochronous heat treatments, the samples of the two sheets produced by TRC and DC presented a 50% recrystallization temperature around 290 ºC and 270 ºC, respectively. Crystallographic texture can change during the metal rolling and recrystallization. These processing steps can optimize the grain orientation distribution in a metal strip to improve, for instance, the stamping process, in order to obtain an aggregated value product. Softening curves were also compared and determined for the two sheets (rolled and annealed) of the AA4006 aluminum alloy produced by twin roll caster TRC and direct chill DC processes. It was detected that the recrystallization of the strip produced by TRC process occurs at a higher temperature than that for the DC process, despite the little differences in their softening curves. Crystallographic texture results, for the sheet samples, were obtained by using X-ray diffraction and electron back scatter diffraction EBSD techniques. These results indicated the shear texture presence on the surface and β fiber at the center of the cold rolled (70% area reduction) sample for the sheet

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Um estudo comparativo entre chapas produzidas pelos processos de lingotamento contínuo e de lingotamento semicontínuo da liga AA4006: microestrutura e textura cristalográfica

Cited by 5 publications

References 13 publications

Effect of casting mode and thermal treatments on the electrical conductivity of the AA4006 aluminum alloy

Effect of casting mode and thermal treatments on the electrical conductivity of the AA4006 aluminum alloy

Avaliação Da Presença De Soluto Em Folhas De Alumínio

Estudo da microestrutura, da textura cristalográfica e da recristalização em chapas obtidas por lingotamento contínuo e semicontínuo da liga de alumínio AA4006.

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