Method for preparing heat-resisting magnesium alloy containing silicon, zirconium and beryllium

Abstract

The invention relates to a method for preparing heat-resisting magnesium alloy containing silicon, zirconium and beryllium. The method comprises the following steps of: adding magnesium-silicon intermediate alloy, magnesium-zirconium intermediate alloy and aluminum-beryllium intermediate alloy in the process of melting magnesium alloy, smelting to obtain a magnesium-alloy ingot, and carrying out vertical equal-channel pressing on the magnesium-alloy ingot for 8 times to obtain the heat-resisting magnesium alloy. The room-temperature tensile strength of the magnesium-alloy ingot subjected to casting and equal-channel pressing is 225MPa and the high-temperature creep resistance is 68h, while the room-temperature tensile strength of the as-cast magnesium-alloy ingot is 127Mpa and the creep rupture life is 0.86h. The elongation rate of the magnesium-alloy ingot is increased to 22% from 7.6%, and the metallographic structure has good compactness. The advanced process is adopted by the method, the data are full and accurate, the product has good heat resistance, and the method is a very ideal method for preparing the heat-resisting magnesium alloy.

Description

technical field [0001] The invention relates to a method for preparing a heat-resistant magnesium alloy added with silicon, zirconium and beryllium, which belongs to the technical field of nonferrous metal preparation and application. Background technique [0002] Magnesium and magnesium alloys are the lightest non-ferrous metal structural materials. They have high specific strength and specific stiffness, good electrical and thermal conductivity, magnetic shielding, damping and shock absorption, and machinability. They are used in aviation, aerospace, automobiles, and electronics. And other industrial fields have been widely used. [0003] Although magnesium and magnesium alloys have many excellent properties and wide applications, they also have many defects and performance deficiencies, such as low strength, poor heat resistance, and poor corrosion resistance, which greatly limit the scope of application of magnesium and magnesium alloys. . [0004] In view of the low m...

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Problems solved by technology

[0004] In view of the low mechanical properties of magnesium and magnesium alloys, some of them add reinforcing agents during the ingot casting process, but the structure of the ingots is poor in compactness, which still cannot meet the strengthening requirements, and some of them adopt the method of pressing magnesium and magnesium alloy plates. method to improve the compactness, but still can not change the metallographic defects of magnesium and magnesium alloys in essence, so that the application of magnesium and magnesium alloys is greatly limited, especially the heat resistance of magnesium and magnesium alloys is poor, it is difficult to Applied on high-end products

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