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The microstructure evolution of Mg-Gd-Y-Nd-Zr heat-resistant magnesium alloy   after deformation and T5 or T6 treatment were studied. In thermoplastic   deformation, dynamic recrystallization and dynamic precipitation has been   taken place at the same time. The dynamic precipitation reduces the   recrystallization nucleation driving force in the grain; it will prevent to   occur dynamic recrystallization partially. Solid solution temperature was   530oC and hold 4h. Age hardening treatments were performed at 225oC and hold   16h. The alloy showed the comprehensive properties are obviously improved   from T6 to T5 heat treatment. After T5 heat treatment the tensile strength of   alloy increased to 359.3 MPa, increased by around 48.5%; Elongation is   increasing from 5.17% to 6.5%. After peak ageing treatment, the main   precipitation is β' phase, the precipitation phase have obvious pinning   effect to grain boundary of the alloy, it will prevent the grain growth   ageing for a long-time. At the same time, strengthening role of precipitate   phase make its strength increased significantly

Study on microstructure evolution of deformed Mg-Gd-Y-Nd-Zr heat-resistant magnesium alloys after solid solution and ageing