Compound preparation method of high-performance rare earth magnesium alloy

Abstract

The invention discloses a compound preparation method of high-performance rare earth magnesium alloy. The compound preparation method of the high-performance rare earth magnesium alloy comprises the steps of alloy smelting, high-pressure speed-controlled condensing, insulating, isothermal extrusion, equal channel angular extrusion and artificial ageing. According to the method, magnesium alloy which contains a trace amount of rare earth element Yb is smelted according to ingredients at first, then the smelted magnesium alloy is poured into a mold cavity which is preheated in advance and then is pressurized and insulated, after pressure is stable, a mold heating system is closed, a cooling medium is fed into a mold cooling system, molten metal is controlled to be cooled down according to apreset speed, after the temperature of a blank is reduced to an extrusion temperature, cooling stops and the blank is insulated, then the blank directly isothermally deforms at large extrusion ratio at the extrusion temperature, and extruded metal is immediately fed into an equal channel angular extrusion cavity which communicates with an extrusion cavity, then is discharged from a mold and is subjected to artificial ageing. A compound processing mold which is independently researched and developed is adopted to implement alloy ingredient design and combined effects of various processing technologies, the high-performance magnesium alloy with ultra-fine grains and high robustness cooperatively is prepared, and the compound preparation method of the high-performance rare earth magnesium alloy has the advantages of short technological process, high efficiency and good quality.

Description

technical field [0001] The invention belongs to the technical field of processing magnesium alloys, and in particular relates to a processing method of a high-performance deformed magnesium alloy, in particular to a composite preparation method of a high-performance deformed magnesium alloy containing rare earth element Yb. Background technique [0002] Magnesium alloy, as the lightest metal structure material in existence, has the advantages of high specific stiffness, specific strength, good shock absorption performance, electromagnetic shielding performance and recyclability, and is an ideal lightweight material. Broad development and application prospects. [0003] However, since magnesium alloy belongs to the hexagonal close-packed structure with high axial ratio, there are few slip systems in plastic processing, poor formability and low strength at room temperature and high temperature, which greatly limit its wide application as high-performance structural materials. ...

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Problems solved by technology

[0005] 1) Although the alloying method has obtained a certain strengthening effect through the second phase strengthening effect, it is difficult to fully exert the alloying potential because no satisfactory dispersed precipitate phase has been found, and it has been reported that alloying can improve the plastic deformation ability of magnesium alloys not significant;

[0006] 2) Deformation processing technology achieves synchronous improvement of plasticity and strength by refining the structure. However, the fine recrystallized structure obtained by this technology is not suitable for further strengthening by heat treatment. The limitations of technical ideas make it difficult to obtain effective precipitation strengthening effects;

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