Mg-wrought alloys recently became an engineer material of constantly increasing interest. The mechanical properties of extruded Mg-feedstock of the alloys AZ80 and AZ31 indicate their suitability for automotive applications in form of high-quality forgings. Therefore a detailed knowledge about the forming behaviour is of particular importance. In order to compare mechanical properties of available Mg-feedstock qualities compression tests at room temperature have been carried out by applying batches of AZ31-and AZ80-feedstock. Cylindrical specimens were made out of received continuously casted as well as extruded AZ31-and AZ80 -rods. A quantitative analysis of Mg-feedstock's microstructure has been carried out. The characterization of the deformability of applied Mg-feedstock under hot working conditions could be performed by means of uniaxial plain strain upsetting tests at temperatures between 300 and 450 C as well as logarithmic strain rates of 10 -1, 1 and 10s. It is shown that the chosen parameter range ensures an enhanced deformability of continuously as well as extruded Mgfeedstock. The subsequently carried out determination of microstructural evolution could be related to obtained flow stress curves of applied batches of Mg-feedstock. Furthermore, FVM/FEM-systems have been employed in order to design a simplified geometry of heated forging dies suitable for forging tests. The tests have been carried out by means of a hydraulic press. During the tests their punch velocity has been varied between 1 and 40 mm/s. Hence numerically simulated results could be confirmed by practical tests. Exemplary forgings of a simplified shape were made out of all applied batches of Mg-feedstock. No remarkable failures have been detected.
Eine gute Umformbarkeit von Blechhalbzeugen aus Magnesiumknetlegierungen stellt sich bekanntlich bei Anwendung von Umformtemperaturen im Bereich von 175 °C – 240 °C ein. Anhand der wirkmedienbasierten Umformverfahren hydromechanisches Tiefziehen und Hochdruckblechumformung ist an handelsüblichen AZ31B‐0 Feinblechen die Einstellung unterschiedlicher Umformparameter erprobt worden. Unter Verwendung von Umformtemperaturen von 175 °C, 200 °C, 225 °C und 240 °C und entsprechend angepassten Niederhalterdrücken ist eine praxisnahe Versuchsgeometrie „Minihood”︁ ausgeformt worden. Im Hinblick auf angewendete Umformverfahren und Versuchsparameter wurde an den Versuchsbauteilen die Blechdickenabnahme und die Radienausprägung bewertet und verglichen. Für ausgewählte Versuchsbauteile, umgeformt mittels der Hochdruckblechumformung bei Temperaturen von 175 °C und 225 °C, ist eine ergänzende Untersuchung hinsichtlich der durch den Umformvorgang verursachten Veränderungen von Oberflächenkennwerten durchgeführt worden. Anhand dieser Ergebnisse werden Hinweise auf die Grenzen des Einsatzes der o.g. Umformverfahren für Magnesiumblech des Legierungstyps AZ31B‐0 gegeben.
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