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The creep resistance of five high-purity die-cast Mg-Al-alloys was investigated in uniaxial compression at temperatures from 70 to 150 o C. The evolution of deformation resistance under creep conditions is described as a function of strain . The work hardening in primary creep determines the times for creep by strains <0.01. Among the investigated alloys AZ91 has the highest creep resistance with the exception of AS41 at stresses below 130 MPa. The microstructural origin of the creep resistance of Mg-Al-alloys is discussed in terms of work hardening by dislocations and hardening by creep-induced precipitation.