Creep behaviour of Mg-8% Sn and Mg-8% Sn-3% Al-1% Si alloys

The work highlights the trends recently observed while evaluating the conventional creep behaviour of Mg-8% Sn and Mg-8% Sn-3% Al-1% Si alloys at 150 degrees C and at four stress levels. The improvement in creep properties in Mg-Sn based alloys is attributed to the presence of thermally stable intermetallics as compared to the AZ-series Mg-alloys. Results revealed that between the two alloys, the creep resistance of Mg-8% Sn-3% Al-1% Si alloy is superior to Mg-8%Sn alloy owing to the presence of Mg2Si intermetallic which retards the grain boundary movement during creep. However, the ductility of the former alloy is lower than that of the later. It is also evident that creep life and creep resistance of all the alloys significantly reduce with increase in applied stress.