Magnesium alloy with high yield strength and corrosion resistance and preparation method thereof

Abstract

The invention relates to a magnesium alloy with high yield strength and corrosion resistance. The magnesium alloy is characterized by comprising the following components in percentage by weight: 5-6.5% of Zn, 1.0-1.5% of Al, 0.2-0.4% of Mn, 0.3-0.6% of Ca, 0.01-0.2% of Y, 0.01-0.2% of Gd and the balance Mg and inevitable impurities, wherein the sum of the weight percentages of Y and Gd in the magnesium alloy is that Y plus Gd is greater than or equal to 0.2% and less than or equal to 0.4%. The invention also relates to a preparation method. Zinc, aluminum, calcium and trace rare earth elements namely yttrium and gadolinium are added to the magnesium alloy, and the addition of calcium can refine magnesium alloy crystal grains and precipitated tissues, and the improvement of subsequent yield strength and tensile strength is facilitated; the trace rare earth elements namely yttrium and gadolinium form a intermetallic compound with aluminum to provide a dispersion nucleation condition for the crystal grains, so that the refinement of a crystal grain structure and improvement of toughness and yield strength of the magnesium alloy are facilitated; and by controlling the percentage content of trace rare earth elements namely yttrium and gadolinium, the corrosion resistance is good while the cost is reduced and higher tensile strength and yield strength are obtained.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy materials, in particular to a high-yield strength and corrosion-resistant magnesium alloy, and also relates to a preparation method of the high-yield strength and corrosion-resistant magnesium alloy. Background technique [0002] Magnesium was discovered for the first time in 1774. It has high specific strength, specific stiffness, excellent damping performance, and many advantages such as antimagnetic, shielding, heat dissipation, easy cutting, easy recycling, etc. It is currently widely used in automobiles and motorcycles Such as transportation, computer, communication, instrumentation, home appliances, metallurgy, aerospace, national defense and military industry and other departments. However, the low absolute strength of magnesium alloys limits its further application in the field of structural materials. [0003] Yield strength is an important parameter to measure the performance of...

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Problems solved by technology

[0005] For example, the Chinese invention patent "A High Yield Ratio Deformed Magnesium Alloy Containing Rare Earth Cerium and Yttrium" with the patent No. CN201410210886.2 (authorized announcement No. CN103952613A), in which rare earth elements are added, the addition of rare earth elements can effectively The yield strength of the magnesium alloy is greatly improved, and the purity of the alloy itself will also be significantly improved, but the price of the rare earth is relatively high, and a large amount of addition will greatly increase the production cost of the magnesium alloy

In addition, it is difficult for the existing magnesium alloys to ensure that the magnesium alloys have high yield strength and good corrosion resistance while ensuring low production costs.

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