Heat-resistant high-strength deformation magnesium alloy and preparation method thereof

Abstract

The invention relates to the technical field of metallurgy, in particular to a heat-resistant high-strength deformation magnesium alloy and a preparation method thereof. The magnesium alloy is prepared from the following compositional alloying elements in percentage by weight: 1 to 5 percent of tin, 0.1 to 2 percent of copper, 0.1 to 1 percent of zinc, 0.1 to 4 percent of calcium, 0.1 to 0.5 percent of manganese, and the balance of magnesium. The preparation method of the heat-resistant high-strength deformation magnesium alloy comprises the following steps: after pure magnesium is pre-heatedand molten, respectively adding intermediate alloys, such as, Mg-Sn, Mg-Cu, Mg-Mn and Mg-Ca, and Zn; refining after the added metals are molten, then, preparing a deformation blank from a refined alloy solution by adopting a continuous casting method, and finally, performing rolling, forging and pressing, extruding or composite deforming on the pretreated continuous casting blank to prepare the heat-resistant high-strength magnesium alloy. The Mg-Sn-Cu-Ca-Zn-Mn heat-resistant high-strength deformation magnesium alloy prepared by the preparation method can serve for a long time under the usingconditions of 200 to 250 DEG C, and meets the requirements of the industries, such as aeronautics and astronautics, war industry, automobiles and the like, on weight reduction; the added elements arecommon alloying elements; the manufacturing cost is low; the heat-resistant high-strength deformation magnesium alloy is applicable to industrial application.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a heat-resistant high-strength deformed magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is an alloy composed of magnesium and other elements. Its characteristics are: low density (about 1.8g / cm3), high strength, large elastic modulus, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloy, good corrosion resistance of organic matter and alkali, mainly used In aviation, spaceflight, transportation, chemical industry, rocket and other industrial sectors. Under the dual pressure of the world's petrochemical energy crisis and environmental pollution, weight reduction is one of the important means to achieve energy efficiency. Countries have put forward weight reduction requirements for industrial fields such as automobiles and aerospace. The density of magnesium alloys is only that of aluminum...

AI Technical Summary

Problems solved by technology

The above wrought magnesium alloys all have good room temperature performance, but because the Mg17Al12 reinforcement phase of the Mg-Al-Zn series wrought magnesium alloy will decompose when the service temperature exceeds 150 ° C, resulting in a sharp decrease in its performance, so the AZ series wrought magnesium alloy The alloy is only suitable for the use temperature below 150°C, and in many cases in the aerospace field, the use temperature of the material is required to be as high as 200-250°C. This performance defect greatly limits the use of AZ series magnesium alloys in aerospace and other fields. Applications

[0004] In recent years, studies have found that adding rare earth elements (such as Nd, Ce, Y, Gd, Dy, Tb, etc.) to magnesium alloys can effectively improve the strength of magnesium alloys, and at the same time greatly improve the heat resistance of magnesium alloys. The relatively mature commercial magnesium alloys include WE54 and WE43, but the price of rare earth elements is extremely high and they are rare elements. After the addition, the cost of these magnesium alloys rises sharply, which also greatly limits the commercial application of the addition of rare earth deformed magnesium alloys.

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