Magnesium alloys are the lightest structural engineering materials, which have many properties such as low density, high strength and stiffness. The alloys are widely used in automotive, electronics and other fields. To expand the application of magnesium alloy, improve its mechanical properties is an important factor. Studies show that the addition of 0.4% Ca, 0.3% Sr to AZ91 can effectively refine the grains and improve the mechanical properties In this paper, AZ91-0.4% Ca-0.3% Sr was chosen as the base material. The effects of separate addition of Gd, Y, and heat treatments of T4 on AZ91D-0.4% Ca-0.3% Sr alloy was investigated.
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