This study presents a design strategy for Al-Mg-Si alloys to control natural aging. Recently, trace addition of Sn was shown to suppress natural aging for up to two weeks, which was explained by the strong trapping of vacancies to Sn atoms. Here we explore the effect of Keywords: aluminum alloys, natural aging, phase transformation kinetics, vacancies, trace elements This is a pre-print of the following article: Werinos, M.; Antrekowitsch, H.; Ebner, T.; Prillhofer, R.; Curtin, W. A.; Uggowitzer, P. J.; Pogatscher, S. Acta Mater. 2016, 118, 296-305.. The formal publication is available at http://dx
In this study, property criteria for automotive Al-Mg-Si sheet alloys are outlined and investigated in the context of commercial alloys AA6016, AA6005A, AA6063 and AA6013. The parameters crucial to predicting forming behavior were determined by tensile tests, bending tests, cross-die tests, hole-expansion tests and forming limit curve analysis in the pre-aged temper after various storage periods following sheet production. Roping tests were performed to evaluate surface quality, for the deployment of these alloys as an outer panel material. Strength in service was also tested after a simulated paint bake cycle of 20 min at 185 °C, and the corrosion behavior was analyzed. The study showed that forming behavior is strongly dependent on the type of alloy and that it is influenced by the storage period after sheet production. Alloy AA6016 achieves the highest surface quality, and pre-ageing of alloy AA6013 facilitates superior strength in service. Corrosion behavior is good in AA6005A, AA6063 and AA6016, and only AA6013 shows a strong susceptibility to intergranular corrosion. The results are discussed below with respect to the chemical composition, microstructure and texture of the Al-Mg-Si alloys studied, and decision-making criteria for appropriate automotive sheet alloys for specific applications are presented.
Krätze und Salzschlacke sind prozessbedingte Reststoffe der Sekundäraluminiumproduktion, die nicht nur aufgrund von Umweltauflagen, sondern auch durch ihr Wertpotenzial einer entsprechenden Aufbereitung bedürfen. Daraus resultierende Rückstände, die in der vorliegenden Arbeit auf ihre Hauptbestandteile untersucht werden (z. B. der Metallgehalt über die Wasserstoffentwicklung), gewinnen durch steigende Rohstoffpreise an Bedeutung. Geeignete Weiterverwendungsmöglichkeiten für diese oxidischen Reststoffe spielen für die Recyclingbetriebe eine wesentliche Rolle, wobei hier im Besonderen auf die Wirtschaftlichkeit eingegangen wird.Treatment of Residues during Aluminium Recycling. Salt slag and dross are waste products produced by the recycling of aluminium. Recovery of useful materials from these wastes is both environmentally necessary and economically feasible. The present article involves a characterization of slag residues and an investigation to determine the metal content by a hydrogen evolution procedure. Due to the increasing price of raw materials, the treatment and utilization of aluminium dross as a commercial product were investigated.Dipl.-Ing. Bernd Prillhofer, Ramona Prillhofer, Ao.Univ.-Prof.Dipl.-Ing.Dr.mont. Helmut Antrekowitsch, alle: Montanuniversität Leoben, Christian-Doppler-Labor für Sekundärmetallurgie der Nichteisenmetalle, Franz-Josef-Straße 18, 8700 Leoben / Österreich.
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