Preparation Method for Heterogeneous Mg Alloys Bar with High Elastic Modulus

A preparation method for heterogeneous Mg alloys bar with high elastic modulus, which is involved in the following steps:

• Step 1 is pretreatment. Selecting two or more metals with much higher elastic modulus than Mg alloys. The metal with higher elastic modulus should be solid state. The surfaces of the solid metal are chemically cleaned to remove the oil stain and oxide. the surfaces are then galvanized to obtain a zinc layer with a proper thickness. The pre-treated solid metal is preset in the cavity of the mold. Then, a heating sleeve is wrapped around the mold to preheat the metals and mold.
• Step 2 is the solid-liquid composite casting. The heating sleeve removed. Casting is then Performed under the antioxygen and inert gas shielding atmosphere.
• Step 3 is deformation. The bar is deformed by extrusion, drawing or rotary forging to eliminated the casting defects and improve the interfacial bonding quality.
• Step 4 is heat treatment. The deformed heterogeneous metal bar is treated by vacuum solution to eliminate the influence of deformation and tailor the microstructure of heterogeneous metal.