Abstract: Various types (particle, whisker and fiber) reinforced magnesium matrix composites have been extensively studied since the early 1980s due to their excellent designability as well as outstanding mechanical and physical properties, including low density, high specific stiffness, low thermal expansion coefficient, favorable damping capability, significant shock resistance and excellent electromagnetic shielding performance. As a light metal matrix composite, magnesium matrix composites are highly competitive in advanced technology field, which possess extensive prospect in aerospace, military, automotive, electronics and other applications. Nevertheless, the plastic deformation capability of magnesium alloy is quite poor, due to close-packed hexagonal structure and limited slip system at ambient temperature. Moreover, incompatibility caused by the difference of physical and chemical properties in hard phase reinforcements and the magnesium matrix alloy would further deteriorate the plastic deformation capability of magnesium composites, which may limit the application of magnesium composites to large extent. Therefore, it is of great importance to carry out the studies on hot deformation of magnesium composites. Previous studies about hot deformation of magnesium composites at home and abroad are mainly focused on the effects of deformation parameters on the deformation behaviors, the phenomena of work hardening and dynamic recrystallization during the hot deformation process, as well as establishment of constitutive equation. Generally, there are five common hot deformation modes of magnesium composites, including superplastic deformation, hot compression, thermal cycling deformation, high temperature creep and secondary hot deformation. Plenty of studies on various hot deformation have been conducted and remarkable progress has been achieved over the years. Furthermore, thanks to its relatively simple deformation process, the hot compression of magnesium composites has attracted more attentions from researchers. In recent years, researchers have studied the influence of different hot deformation methods on microstructure and properties of magnesium composites, as well as the effect of deformation parameters including deformation strain, temperature and strain rate on hot deformation behavior of magnesium composites. In addition, the microstructure evolution and relevant deformation mechanisms of magne-sium composites during the hot deformation process have been investigated, and the corresponding constitutive equations have been established combined with numerical analysis. These research results would provide great supports for the determination and optimization of hot deformation processing of magnesium composites, and contribute to controlling the microstructure and properties of magnesium composites effectively. Different kinds of hot deformation of magnesium matrix composites are introduced. The constitutive equation as well as softening mechanism of hot deformation of magnesium matrix composites are explained in detail. Finally, the critical research directions and the remaining challenges to be addressed are summarized.
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2018, Vol. 32 
