Creep behavior of Mg-9Gd-1Y-0.5Zr (wt.%) alloy piston by squeeze casting

► Creep rate and strain at 100 h are 0.4 × 10− 9 s− 1 and 0.014% at 200 °C/50 MPa. ► Creep exponent and activation energy are 1.66-4.47 and 115.9-174.2 kJ/mol. ► Thermal stable β phase appears after creep test at elevated temperature. ► Creep rate and rupture time are modeled by Monkman-Grant relationship.