Changes in solid solution composition as a function of artificial ageing time for aluminium alloy 7075

Bartges, C.

doi:10.1007/bf00271318

Cited by 18 publications

(2 citation statements)

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“…Después de 10 minutos, los valores de OCP son de -0,773 V, -0,760 V y -0,734 V para el tratamiento T6, RRA y T73, respectivamente. El sobre-envejecimiento de la aleación de aluminio 7075 causa un desplazamiento del OCP en el sentido positivo; lo cual es debido a un progresivo agotamiento de Zn y Mg en la matriz, generado por la precipitación y engrosamiento de las partículas de endurecimiento η' y η (MgZn 2 ) [25]; resultados similares fueron reportados por ANDREATTA et al [26].…”

Section: Comportamiento Electroquímico De La Aleación De Aluminio 707unclassified

Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075

et al. 2018

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RESUMENEn este estudio, los efectos de los tratamientos térmicos en el pico de envejecimiento (T6), sobreenvejecimiento (T73) y proceso de regresión y re-envejecimiento (RRA, regresión a 200 °C durante 10 min) sobre la microestructura, resistencia mecánica, corrosión por exfoliación y corrosión intergranular de aleación de aluminio 7075 ha sido investigado mediante microscopia óptica, microscopía electrónica de barrido, ensayos de tracción, ensayos ASTM G110, ensayos ASTM G34, curva de polarización y espectroscopia de impedancia electroquímica (EIS).Los resultados de los ensayos de corrosión intergranular (ASTM G110) y los ensayos de corrosión por exfoliación (ASTM G34), aplicados a los tres tratamientos definen un orden de susceptibilidad a la corrosión dada por: T6  T73  RRA. Las tendencias de la resistencia a la corrosión son confirmadas mediante curvas de polarización y ensayos EIS. El tratamiento térmico RRA mejora la resistencia a la corrosión intergranularexfoliación de la aleación de aluminio 7075 sin sacrificar su resistencia mecánica en comparación con el tratamiento térmico T6. El efecto del tratamiento térmico sobre la resistencia mecánica y la resistencia a la corrosión se explica en función del estado de precipitación en la matriz y en los límites de grano.Palabras clave: Aleación de aluminio 7075, propiedades mecánicas, corrosión intergranular, corrosión exfoliación, espectroscopia de impedancia electroquímica. ABSTRACTIn this study, the effects of heat treatments in the peak aged (T6), overaged (T73) and retrogression and reaging (RRA, retrogression at 200 °C for 10 min) on the microstructure, mechanical strength, exfoliation corrosion and intergranular corrosion of aluminum alloy 7075, has been investigated by optical microscope, scanning electron microscopy, tensile tests, ASTM G110 tests, ASTM G34 tests, polarization curve and electrochemical impedance spectroscopy (EIS).The results of intergranular corrosion tests (ASTM G110) and exfoliation corrosion tests (ASTM G34), applied to the three treatments defines an order of susceptibility to corrosion given by: T6  T73 > RRA. The trends of the corrosion resistance were further confirmed by polarization curve and EIS test. The RRA heat treatment improved the intergranular-exfoliation corrosion resistance of aluminum alloy 7075 without sacrificing the mechanical strength compared to T6 temper. The effect of heat treatment on mechanical strength and corrosion resistance is explained based on the state of precipitation in the matrix and grain boundaries.

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Section: Comportamiento Electroquímico De La Aleación De Aluminio 707unclassified

Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075

et al. 2018

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“…The heat treatment regulation for 7000 series aluminum alloys has been achieved a mass of fruitful results in several decades [1][2]. However, the material process optimization study is basically to improve the use of single factor test and then test again to improve the way.…”

Section: Introductionmentioning

confidence: 99%

Hardness Prediction of 7003 Aluminum Alloy by Gradient Descent Algorithm in BP Artificial Neural Networks

Ren

Song

2011

AMR

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In order to shorten the fussy experimental process in heat treatment of 7003 aluminum alloy, back-propagation (BP) artificial neural network control of scheme has been proposed. The network of arithmetic has been deduced by using gradient descent algorithms. A BP neural network has been established between the heat treatment technique and the hardness. The results indicated that the predicted results are closed to the test results. The weakness that the nonlinear and time variation relationship between heat treatment and the hardness could be approached more accurately, effectively by using single-factor-experiment method has been overcome. Hence providing a effective, economical，rapid way for the heat treatment optimization of nonferrous metals and ferrous metal.

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Influence of nitrogen implantation on the localized corrosion resistance of different tempers of AA7075 aluminium alloy

Abreu

Cristóbal

Figueroa

et al. 2010

Surface & Interface Analysis

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This paper reports the study of the effect of nitrogen implantation on the localized corrosion resistance of the passive layers generated on different tempers of AA7075 aluminium alloy.Cyclic potentiodynamic polarization has been employed to analyze the resistance to localized corrosion of the alloys in a chloride medium, whereas exfoliation corrosion susceptibility test (EXCO-Test) have been performed to evaluate the influence of nitrogen implantation on exfoliation resistance.Results show that nitrogen implantation (dose of 2 × 10 17 N + ions/cm 2 and energy of 50 keV) does not have a clear positive effect on exfoliation resistance as it is evident on EXCO testing. However, electrochemical experiments performed in 1 mM NaCl solution reveal a light increase on localized corrosion resistance on implanted alloys. Moreover, the results demonstrate that the susceptibility of the 7075 aluminium alloy to different types to localized corrosion such as, pitting, intergranular and exfoliation greatly depends on the aging treatment, even under implantation conditions.

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Changes in solid solution composition as a function of artificial ageing time for aluminium alloy 7075

Cited by 18 publications

References 18 publications

Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075

Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075

Hardness Prediction of 7003 Aluminum Alloy by Gradient Descent Algorithm in BP Artificial Neural Networks

Influence of nitrogen implantation on the localized corrosion resistance of different tempers of AA7075 aluminium alloy

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