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摘要
This paper reviewed the research progress of magnesium-rare earth alloys in extrusion, rolling and severe plastic deformation (SPD) technologies. The effects of deformation temperature, deformation speed and extrusion ratio on microstructure and mechanical properties of the extruded samples were introduced. It is indicated that grain refinement or formation of bimodal-grained structure through deformation process control can improve the mechanical properties of the alloy. The research progress on rolling deformation of magnesium-rare earth alloy was summarized, it is found that the ultra-high strength magnesium alloy can be fabricated by forming bimodal-grained structure or introducing stacking faults through process control. The effects of equal channel angular pressing (ECAP), high-pressure torsion (HPT) and multi-directional forging (MDF) on the microstructure and mechanical properties of alloys were summarized. It is exhibited that SPD technology, especially HPT, is an effective method for preparing nanometer-scale ultrafine grains. Compared with extrusion and rolling, the process is more complicated and expensive, and the size of the prepared samples is often smaller. Finally, the suggestions were provided for the development direction of magnesium-rare earth alloy plastic deformation technology. ? 2022, China Science Publishing & Media Ltd. All right reserved.
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