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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Mater. | doi: 10.3389/fmats.2019.00262

Compressive creep behaviour of high-pressure die-cast aluminium-containing magnesium alloys developed for elevated temperature applications

 Sarkis Gavras1, Suming Zhu2,  Mark A. Easton2, Mark A. Gibson3 and  Hajo Dieringa1*
  • 1Helmholtz Centre for Materials and Coastal Research (HZG), Germany
  • 2School of Engineering, College of Science, Engineering and Health, RMIT University, Australia
  • 3CSIRO Manufacturing, Australia

In addition to AZ- and AM-series magnesium alloys, which are mainly used at ambient temperature, there are also die-cast magnesium alloys developed for use at elevated temperatures. This paper examines the compressive creep resistance of several aluminium-containing magnesium high-pressure die-cast alloys, including the commercially available AE42, AE44-2, AE44-4, MRI230D alloys and newly developed DieMag series, i.e. DieMag211, DieMag422 and DieMag633. Compressive creep is the common load case for automotive powertrain components such as transmission housings, engine blocks or oil pans, which are typically mounted with steel or aluminium bolts that have lower thermal expansion than magnesium alloys. When the components heat up, there is a compressive load in the area around the bolt. The compressive creep experiments are accompanied by microstructure investigations. It is shown that MRI230D and the two high-concentrated DieMag alloys have the best creep resistance at 200°C. Similar results are also observed in the tensile tests at room temperature and 150°C, with DieMag633 showing outstanding strength.

Keywords: Magnesium alloys, High-pressure die casting (HPDC), Creep (B), microstructure, Stress exponent of minimum creep rate

Received: 24 Apr 2019; Accepted: 07 Oct 2019.

Copyright: © 2019 Gavras, Zhu, Easton, Gibson and Dieringa. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Hajo Dieringa, Helmholtz Centre for Materials and Coastal Research (HZG), Geesthacht, 21502, Schleswig-Holstein, Germany,