To investigate the processability of Mg-1Ca-0.5Mn alloys with and without the addition of Ce, hot-compression tests were performed on a Gleeble-3800 thermo-mechanical simulator at 300–450 °C and 0.001–5 s–1. The flow stress, processing map, and microstructure characterization of the alloys were investigated. The results show that the flow stress of the Mg-1Ca-­0.5Mn-­0.5Ce alloy was significantly improved for all the thermomechanical deformation parameters, and the dynamic recrystallization phenomenon was delayed. This phenomenon was attributed to the finer grains and the dense distribution of the fine and coarse particles pinned at the grain boundaries. The processing map shows that the Mg-1Ca-0.5Mn-0.5Ce alloy has better processing performance at a low strain rate.

We elucidate here the influence of the rolling process on the microstructure and tensile properties of Mg-1Ca-0.5Mn-0.53Ce alloy. Intriguingly, the alloy subjected to 5-pass lowered-temperature rolling exhibited an excellent strength-ductility balance (ultimate tensile strength (UTS) = 261.4 MPa and elongation (EL) = 20%), which was far better than the one subjected to 4-pass low temperature rolling (UTS = 218.3 MPa and EL = 4.3%). The coarse Mg2Ca particles in the 4-pass sample led to the local stress concentration, with consequent initiation of micro-cracks at the early deformation stage. In contrast, the microstructure of the 5-pass sample characterized by homogeneous ultra-fine grain, double peak texture, and refined precipitates contributed to the superior tensile properties.

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