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. The special pure aluminum coating was prepared on the surface of the as-cast AZ80 magnesium alloy by using the advanced technique named cold gas dynamic spray (CGDS). The interface morphology of coatings and substrate were observed. With the changes of the heat treatment temperature and the holding time, the interface morphologies of the coatings and the magnesium substrate were compared and the diffusion phenomena of them were studied. The experimental results showed that the great changes had taken place in the interface morphology of the coatings. Meanwhile, the great changes had also taken place in the diffusion between the magnesium in the substrate and the aluminum in the coatings. Howe ver, the diffusions between them were not obvious any more when the heat treatment temperature reached a definite value. Introduction Currently, magnesium alloy whose density is 1.751.90g/cm 3 is the lightest structural metallic material in practice. Although the strength and elastic modulus of magnesium alloy are lower, its specific strength and specific stiffness are higher. The usage of magnesium alloy makes component achieve higher stiffness and better weight-loss effect than the usage of aluminum in the component with same weight. Besides, magnesium alloy has such advantages as abundant natural resources and green environmental protection. It is the key structur al material to realize the light productions of the military and civilian equipments, which has been r eceived the close attention of all over the world

Study on Effects of Heat Treatment on Morphology of Al Coating on the Surface of Mg Alloy by Cold Spray