Veränderungen der mechanischen Eigenschaften von Magnesium‐Druckgusslegierungen nach langzeitiger thermischer Beanspruchung

Abstract

Die thermische Belastbarkeit von Magnesium‐Druckgusslegierungen ist noch nicht ausreichend untersucht. Um die Auswirkung einer thermischen Belastung auf die Gefügestabilität und damit auf das Festigkeits‐ und Verformungsverhalten einschätzen zu können, werden die Legierungen AZ91, AM50 und AE42 bei 150 °C und 200 °C einer 1000 h‐Langzeitglühung unterworfen. Nach der Glühung werden Zugversuche, in situ‐Zugversuche und Mikrohärtemessungen bei Raumtemperatur durchgeführt und die Ergebnisse anhand der mikrostrukturellen Veränderungen diskutiert.

Effect of position on the tensile properties in high-pressure die cast Mg alloy

“…The comparison of the obtained tensile properties with the reported literature data of 10 mm thick HPDC castings is presented in Fig. 5 [19][20][21][22][23]. The overall YS and UTS values presented in the present work are in good agreement with Regener et al [21], Stich et al [22] and Schindelbacher et al [7].…”

The influence of storage and heat treatment on a magnesium-based implant material: an in vitro and in vivo study

“…Seitz [ 23 ] also observed a reduction in the maximum load until failure similar to the findings in the present study. A possible explanation might be that heat treatment promotes the precipitation of β-phases (Mg 17 Al 12 ) or other brittle phases which influences mechanical [ 23 – 25 ] as well as corrosion properties [ 12 ]. Grain size is an important structural element in aging and was therefore analyzed in the present study.…”

Evolution of microstructure and hardness of AE42 alloy after heat treatments

“…As mentioned before, Regener and co-workers have also observed the ageing strengthening in this alloy [9,10]. They have explained that this behavior was caused by the precipitation of the ␤-phase near the grain boundaries.…”

“…No apparent microstructural change occurs during heat treatment [8]. Recent work on these alloys prepared by HPDC showed that there was a minor increase in the yield strength after heat treatment at low temperatures [9], indicating that precipitation reactions may be occurring. Earlier work also reported that the hardness increased a little if these alloys were aged above 150 • C for 10 h due to the precipitation of Mg 17 Al 12 -phase [10].…”