Creep of die-cast light-weight Mg-Al-base alloy AZ91hp

Since a few years Mg alloys see a renaissance as light-weight materials for automobiles. In cars the Mg-alloys have to withstand elevated temperatures. Under these conditions the time dependence of the deformation of Mg-alloys must no longer be neglected. Therefore a basic research program was started in cooperation with AUDI AG, Ingolstadt, to understand and quantify the time dependent deformation behavior of the new high purity Mg-Al-base alloy AZ91. The results show that die-cast AZ91 has a good resistance to primary creep at temperatures up to 150 degrees C.