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Heat treatment process of large-size high-tensile magnesium alloy extrusion

A magnesium alloy, large-scale technology, applied in the field of heat treatment process of Mg-Gd-Y-Zr rare earth magnesium alloy, can solve the problem that large-scale magnesium alloy materials have not been developed

Inactive Publication Date: 2010-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on this alloy is still mainly in the laboratory stage, and no large-scale magnesium alloy material that can be widely used in industrial practice has been developed yet.

Method used

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  • Heat treatment process of large-size high-tensile magnesium alloy extrusion
  • Heat treatment process of large-size high-tensile magnesium alloy extrusion
  • Heat treatment process of large-size high-tensile magnesium alloy extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The Φ97mm semi-continuous ingot was first kept at 445°C for 5 hours, then at 535°C for 15 hours, and air-cooled to room temperature;

[0013] Extrude the homogenized billet into a Φ22mm bar, heat the bar to 200°C after extrusion, keep it warm for 64 hours, and air cool to room temperature.

[0014] After the heat treatment process of the present invention, the strength properties of the material are shown in Table 1.

Embodiment 2

[0016] The Φ129mm semi-continuous ingot was first kept at 450°C for 5 hours, then at 540°C for 15 hours, and air-cooled to room temperature;

[0017] Extrude the homogenized Φ129mm ingot into a Φ30mm bar, heat the bar to 220°C after extrusion, keep it warm for 20 hours, and air cool to room temperature.

[0018] After the heat treatment process of the present invention, the strength properties of the material are shown in Table 1.

Embodiment 3

[0020] The Φ210mm semi-continuous ingot was first kept at 455°C for 5 hours, then at 545°C for 15 hours, and air-cooled to room temperature;

[0021] Extrude the homogenized Φ210mm ingot into a plate with a width of 150mm and a thickness of 20mm. After extrusion, the plate is heated to 220°C, kept for 20 hours, and cooled to room temperature in air.

[0022] After the heat treatment process of the present invention, the strength properties of the material are shown in Table 1.

[0023] Table 1. Alloy mechanical property table before and after the present invention handles

[0024]

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PUM

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Abstract

The invention relates to a heat treatment process of large-size high-tensile magnesium alloy extrusion. The magnesium alloy extrusion comprises the components in percent by weight of 6 to 13 percent of Gd, 2 to 6 percent of Y, 0.3 to 0.8 percent of Zr, and the balance of Mg and unremovable impurity elements. The heat treatment process comprises the steps of: homogenizing magnesium alloy ingots semicontinuously casted at a temperature of 445 to 455 DEG C for 5 h and at a temperature of / 535-545 DEG C for 15h; extruding and moulding the homogenized magnesium alloy ingots to obtain large-size extrusion boards and bars, and carrying out artificial aging treatment on the extrusion boards at a temperature of 200 to 220 DEG C for 20-64h. The strength of the magnesium alloy is greatly improved. The tensile strength of the extrusion boards subjected to artificial aging is more than 460Mpa, and the yield strength is more than 390Mpa. The tensile strength of the bars subjected to the artificial aging is more than 455Mpa, and the yield strength is more than 400Mpa.

Description

technical field [0001] The invention relates to a heat treatment process of a large-scale high-strength magnesium alloy extruded material, especially a heat treatment process of a Mg-Gd-Y-Zr rare earth magnesium alloy containing gadolinium and yttrium. The strength of the extruded magnesium alloy product can be improved through heat treatment Greater than 450MPa. Background technique [0002] Magnesium alloy has the advantages of high specific strength and rigidity, good thermal and electrical conductivity, good electromagnetic shielding, damping and vibration reduction, machinability and low processing cost, so it is widely used in aerospace, national defense and transportation fields. And the 3C field has broad application prospects. However, the tensile strength of existing magnesium alloy grades is lower than 400MPa, mostly between 250-350MPa. The low strength of magnesium alloy limits its wide application in aerospace and automotive industries. Therefore, how to improv...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 刘楚明高永浩万迎春李慧中陈志永
Owner CENT SOUTH UNIV
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