Method for preparing magnesium alloy

A magnesium alloy and hot extrusion technology, which is applied in the field of metal materials, can solve the problems of low increase range, low increase range of alloy yield strength, and reduced number of metastable phases, so as to achieve the effect of increasing the number, increasing the strength, and improving the strengthening effect

Inactive Publication Date: 2010-10-13
CHONGQING UNIV
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Problems solved by technology

[0004] Rare earth magnesium alloys with high strength, heat resistance and corrosion resistance can be obtained after smelting, solid solution and aging of rare earth, magnesium and other metals, but their yield strength is still low, which cannot meet the actual needs of engineering
The present inventors have found through research that the rare earth-containing magnesium alloy is subjected to solution treatment including three processes of heating, heat preservation and quenching or solution treatment including two processes of heating and heat preservation, and then subjected to hot extrusion and aging treatment to obtain The yield strength of the magnesium alloy has been improved, but the increase rate is relatively low. The reason is as follows: After the al

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  • Method for preparing magnesium alloy

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preparation example Construction

[0025] The invention provides a method for preparing a magnesium alloy, comprising:

[0026] Solid solution process: heating the as-cast magnesium alloy to 350°C-550°C and performing heat preservation treatment, the as-cast magnesium alloy has the following atomic ratio composition: Mg 1-a-b RE a Zr b , wherein, RE is one or more of Y, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, 1%≤a ≤6%, 0.05%≤b≤0.5%;

[0027] Hot extrusion process: hot-extruding the magnesium alloy after heat preservation treatment at 350°C-550°C, and then rapidly cooling to room temperature;

[0028] Cold rolling process: cold rolling the hot-extruded magnesium alloy at a reduction of 5% to 50%;

[0029] Aging process: performing aging treatment on the cold-rolled magnesium alloy.

[0030] The present invention uses cast magnesium alloys containing rare earth and zirconium as raw materials to obtain magnesium alloys with high yield strength through solid solution, hot extrusion, ...

Embodiment 1

[0048] Put 85.5g magnesium ingot in SF 6 and CO 2 Melt under the protection of the formed mixed gas, add 14g gadolinium ingot and 0.5g zirconium ingot to the molten magnesium at 700°C, remove the surface residue after melting, and cast after obtaining the melt to obtain cast magnesium alloy, atomic ratio composition As follows: Mg 97.39 Gd 2.46 Zr 0.15 .

Embodiment 2

[0050] The as-cast magnesium alloy prepared in Example 1 was directly extruded with a plate at 505° C. after solid solution for 24 hours at 505° C., the extrusion rate was 0.6 mm / min, and the extrusion ratio was 28: 1; the extruded The alloy is water-quenched immediately; the water-quenched alloy is rolled in one pass at room temperature, and the reduction is 10%; the cold-rolled alloy is aged at 200°C to obtain the peak hardness of aging. magnesium alloy.

[0051] A tensile test was performed on the magnesium alloy, and the results are shown in Table 1. Table 1 shows the mechanical property test results of the magnesium alloys provided in the examples and comparative examples of the present invention.

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Abstract

The invention provides a method for preparing a magnesium alloy. The method comprises the following: solution treatment process: heating a cast magnesium alloy to 350 to 550 DEG C and performing heat preservation treatment, wherein the cast magnesium alloy has the following atomic ratio composition: Mg1-a-bREaZrb, wherein RE is one or more of Y, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; a is equal to or more than 1 percent and equal to or less than 6 percent; b is equal to or more than 0.05 percent and equal to or less than 0.5 percent; hot extrusion process, performing heat extrusion on the magnesium alloy subjected to the heat preservation treatment at the temperature of between 350 and 550 DEG C and then fast cooling the obtained product to the room temperature; cold rolling process, performing cold rolling on the magnesium alloy subjected to the heat extrusion at the rolling reduction of 5 to 50 percent; and ageing process, performing ageing treatment on the magnesium alloy subjected to the cold rolling. The yield strength of the prepared Mg-Gd-Zr alloy reaches 447MPa.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a preparation method of a magnesium alloy. Background technique [0002] Magnesium alloy is currently a relatively light metal material, with high specific strength and specific stiffness, good antimagnetic, electronegativity, thermal conductivity, shock absorption and cutting performance, etc., but the strength of magnesium alloy is low , poor heat resistance, which limits its application. [0003] The difference between the atomic size radius of most rare earth elements and magnesium is within ±15%. They have a large solid solubility in magnesium and have good solid solution strengthening and precipitation strengthening effects. Therefore, adding rare earth elements to magnesium alloys to form Rare earth magnesium alloys can effectively improve the microstructure and microstructure of magnesium alloys, improve the strength, heat resistance, and corrosion resistance of ...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 刘庆李荣广聂建峰黄光杰
Owner CHONGQING UNIV
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