Electrochemical properties of Al-6060 alloy after industrial-scale ECAP

Equal-channel angular pressing (ECAP) as the most famous method of severe plastic deformation has the potential for up-scaling from laboratory to industrial. Therefore, it is important to examine practice-relevant properties of large billets deformed by this process. Mechanical properties and corrosion resistance essentially influence the service life of construction components. Mechanical properties of an Al-6060 alloy after industrial-scale ECAP (cross-section of the billet 50×50 mm) have been analyzed by P. Frint [4, 17]. The effect of one pass of industrial-scale ECAP on the electrochemical properties of an Al-6060 alloy by means of potentiodynamic polarization tests in 0.1M NaCl solution is investigated. The corroded surfaces were analyzed by means of optical microscopy. In order to characterize the homogeneity of the corrosion behaviour of the ECAP-processed material, all analyzes were taken in different zones perpendicular to the extrusion axis. The results indicate that one ECAP pass does not deteriorate the electrochemical behaviour of the Al-6060 alloy.Вплив одноразового рівноканального кутового пресування на електрохімічні властивості сплаву Al-6060 досліджено методом потенціодинамічної поляризації в 0,1М розчині NaCl. Поверхню після корозії обстежено за допомогою оптичної мікроскопії. Для опису гомогенності характеру корозії матеріалу проаналізовано різні зони, перпендикулярні осі пресування. Виявлено, що воно не змінює електрохімічну поведінку сплаву.Влияние однократного равноканального углового прессования на электрохимические свойства сплава Al-6060 исследовано методом потенциодинамической поляризации в 0,1М растворе NaCl. Поверхность после коррозии обследовано с помощью оптической микроскопии. Для описания гомогенности характера коррозии материала проанализированы разные зоны, перпендикулярные оси прессования. Выявлено, что оно не изменяет электрохимическое поведение сплава

Вплив рівноканального кутового пресування на електрохімічні властивості сплаву Al-6060

Equal-channel angular pressing (ECAP) as the most famous method of severe plastic deformation has the potential for up-scaling from laboratory to industrial. Therefore, it is important to examine practice-relevant properties of large billets deformed by this process. Mechanical properties and corrosion resistance essentially influence the service life of construction components. Mechanical properties of an Al-6060 alloy after industrial-scale ECAP (cross-section of the billet 50×50 mm) have been analyzed by P. Frint [4, 17]. The effect of one pass of industrial-scale ECAP on the electrochemical properties of an Al-6060 alloy by means of potentiodynamic polarization tests in 0.1M NaCl solution is investigated. The corroded surfaces were analyzed by means of optical microscopy. In order to characterize the homogeneity of the corrosion behaviour of the ECAP-processed material, all analyzes were taken in different zones perpendicular to the extrusion axis. The results indicate that one ECAP pass does not deteriorate the electrochemical behaviour of the Al-6060 alloy.Вплив одноразового рівноканального кутового пресування на електрохімічні властивості сплаву Al-6060 досліджено методом потенціодинамічної поляризації в 0,1М розчині NaCl. Поверхню після корозії обстежено за допомогою оптичної мікроскопії. Для опису гомогенності характеру корозії матеріалу проаналізовано різні зони, перпендикулярні осі пресування. Виявлено, що воно не змінює електрохімічну поведінку сплаву.Влияние однократного равноканального углового прессования на электрохимические свойства сплава Al-6060 исследовано методом потенциодинамической поляризации в 0,1М растворе NaCl. Поверхность после коррозии обследовано с помощью оптической микроскопии. Для описания гомогенности характера коррозии материала проанализированы разные зоны, перпендикулярные оси прессования. Выявлено, что оно не изменяет электрохимическое поведение сплава.The results presented in this paper have been obtained in the framework of the IGF project 16831 BG. This project of the Association for the Research Institute for Precious Metals and Metals Chemistry (Verein für das Forschungsinstitut für Edelmetalle und Metallchemie) has been carried out within the AiF (Arbeitsgemeinschaft industrieller Forschungsvereinigungen „Otto von Guericke“ e.V. (AiF)) programme to promote joint industrial research and development (Industrielle Gemeinschaftsforschung – IGF) and has been funded by the German Federal Ministry of Economics and Technology (BMWi) on the basis of a decision of the German Bundestag

Microstructural Features and Mechanical Properties after Industrial Scale ECAP of an Al 6060 Alloy

Future applications of ultrafine-grained, high performance materials produced by equal-channel angular pressing (ECAP) will most likely require processing on an industrial scale. There is a need for detailed microstructural and mechanical characterisation of large-scale, ECAP-processed billets. In the present study, we examine the microstructure and mechanical properties as a function of location and orientation within large (50 x 50 x 300 mm³) billets of an Al 6060 alloy produced by ECAP (90° channel angle) with different magnitudes of backpressure. The internal deformation is analysed using a grid-line method on split billets. Hardness is recorded in longitudinal and cross-sectional planes. In order to further characterise the local, post-ECAP mechanical properties, tensile tests in different layers are performed. Moreover, low voltage scanning transmission electron microscopy observations highlight relevant microstructural features. We find that the homogeneity and anisotropy of mechanical properties within the billets depend significantly on the geometry of the shear zone. We demonstrate that deformation gradients can be reduced considerably by increasing the backpressure: The opening-angle of the fan-shaped shear zone is reduced from ψ ≈ 20 ° to ψ ≈ 7 ° when the backpressure is increased from 0 to 150 MPa. Backpressures of 150 MPa result in excellent homogeneity, with a relative variation of tensile mechanical properties of less than 7 %. Our investigation demonstrates that ECAP is suitable for processing homogenous, high performance materials on a large scale, paving the way for advanced industrial applications.</jats:p