Creep characteristics of a hypoeutectic Mg–Ca binary alloy with a near-fully lamellar microstructure

The creep behavior of a hypoeutectic Mg–14.8 mass% Ca cast alloy with an α-Mg/C14–Mg2Ca near-fully lamellar microstructure was investigated at 473 K. Transmission electron microscopy shows that dislocations are introduced within the lamellar microstructure of the alloy during casting; the dislocation segments in the α-Mg plates are located on basal planes. The stress exponent of the creep rate is unity in the early stage of transient creep. Creep deformation of the alloy is ascribed to the easy glide of the introduced dislocations.

► We develop a hypoeutectic Mg–Ca cast alloy with a near-fully lamellar microstructure. ► Dislocations are introduced within the lamellar microstructure during casting. ► The dislocation segments in the α-Mg plates are located on the basal planes. ► Creep of the alloy is ascribed to the easy glide of the introduced dislocations.