Thermal deformation strengthening method of rare-earth magnesium alloy

A technology of rare earth magnesium and hot deformation, which is applied in the field of metal material forming and processing, can solve the problems of alloy room temperature deformation ability to be improved, low alloy elongation, grain refinement, etc., achieve high surface quality, simple operation, and reduce production cost effect

Inactive Publication Date: 2013-12-25
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN102828133A improves the strength and elongation of magnesium alloys by adding rare earth elements, strong thermal deformation, and rapid warm deformation, but the deformation ability of the alloy at room temperature still needs to be improved; CN102392165A improves the alloy by electromagnetic oily semi-continuous casting, combined with reverse warm extrusion The strength and yield ratio of the alloy, but the elongation of the alloy is still low
The most typical conventional thermal deformation treatment is a single isothermal hot extrusion, but it is difficult to refine the grains below 10μm
In previous studies, some theoretical methods for large plastic deformation were proposed, such as equal angular extrusion method, cumulative rolling and high-pressure torsion method, etc. to obtain microstructures with fine grains, even reaching submicron and nanometer levels; However, these methods are only suitable for the preparation of small-scale materials

Method used

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  • Thermal deformation strengthening method of rare-earth magnesium alloy
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  • Thermal deformation strengthening method of rare-earth magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment adopts the 180mm diameter round ingot that common casting obtains;

[0026] 1. Homogenize the alloy round ingot at 525°C for 10 hours, then cool it with water, and remove the skin;

[0027] 2. Before extrusion, apply molybdenum disulfide lithium-based lubricant evenly on the inner wall of the extrusion die and the inner wall of the extrusion cylinder for lubrication; heat the homogenized magnesium alloy billet to 400°C for 45 minutes and then perform an extrusion. The pressure ratio is 9:1, the extrusion speed is 1m / min, and the temperature of the extrusion die and extrusion barrel is kept at 380°C;

[0028] 3. Heat the primary extruded magnesium alloy round bar to 400°C for 45 minutes, peel off the skin and perform secondary extrusion. The extrusion ratio is 9:1, the extrusion speed is 1m / min, and the temperature of the extrusion die and extrusion cylinder is kept at 380°C;

[0029] 4. The rare earth magnesium alloy after twice extrusion is sub...

Embodiment 2

[0031] The present embodiment adopts the 180mm diameter round ingot that common casting obtains;

[0032] 1. Homogenize the alloy round ingot at 525°C for 16 hours, then cool it with water, and remove the skin;

[0033] 2. Before extrusion, apply molybdenum disulfide lithium-based lubricant evenly on the inner wall of the extrusion die and the inner wall of the extrusion cylinder for lubrication; heat the homogenized magnesium alloy billet to 430°C for 45 minutes and then perform an extrusion. The pressure ratio is 16:1, the extrusion speed is 1m / min, and the temperature of the extrusion die and extrusion barrel is kept at 400°C;

[0034] 3. Heat the primary extruded magnesium alloy round bar to 430°C for 45 minutes, peel off the skin and perform secondary extrusion. The extrusion ratio is 16:1, the extrusion speed is 1m / min, and the temperature of the extrusion die and extrusion cylinder is kept at 400°C;

[0035]4. The rare earth magnesium alloy after twice extrusion is su...

Embodiment 3

[0037] The present embodiment adopts the 180mm diameter round ingot that common casting obtains;

[0038] 1. Homogenize the alloy round ingot at 525°C for 24 hours, then cool it with water, and remove the skin;

[0039] 2. Before extrusion, apply molybdenum disulfide lithium-based lubricant evenly on the inner wall of the extrusion die and the inner wall of the extrusion cylinder for lubrication; heat the homogenized magnesium alloy billet to 450 ° C for 45 minutes and then perform an extrusion. The pressure ratio is 25:1, the extrusion speed is 1m / min, and the temperature of the extrusion die and extrusion barrel is kept at 420°C;

[0040] 3. Heat the primary extruded magnesium alloy round bar to 450°C and keep it warm for 45 minutes, peel off the skin and perform secondary extrusion. The extrusion ratio is 25:1, the extrusion speed is 1m / min, and the temperature of the extrusion die and extrusion cylinder is kept at 420°C;

[0041] 4. The rare earth magnesium alloy after t...

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Abstract

The invention provides a thermal deformation strengthening method of a rare-earth magnesium alloy, relating to the fields of metal material formation and processing. The method comprises the following steps: carrying out homogenizing treatment on an ingot blank, which is prepared by metal mold gravity casting, at 525 DEG C for 10-24 hours, cooling with water, and removing the shell; preheating the shelled ingot blank at 400-500 DEG C for 0.5-2 hours, and carrying out extrusion twice according to an extrusion ratio of (5-30):1 at the extrusion speed of 0.1-10 m/min in a forward extrusion mode, wherein the temperatures of the extrusion mold and the extrusion cylinder are kept at 380-420 DEG C in the extrusion process; and holding the extruded rare-earth magnesium alloy at 450-560 DEG C for 10-24 hours, carrying out water quenching solution treatment, and holding at 180-250 DEG C for 10-45 hours to perform aging heat treatment. The method is simple and easy to control, can produce difficult-to-form metal materials, can implement continuous large-scale production, effectively lowers the production cost, and can greatly enhance the mechanical properties of the rare-earth magnesium alloy.

Description

technical field [0001] The invention relates to the field of metal material forming and processing. It specifically relates to a rare-earth magnesium alloy that uses conventional hot extrusion equipment to control the extrusion process and parameters to improve the plasticity of the magnesium alloy while maintaining the high strength of the material. Background technique [0002] Due to its low density, high specific strength, and good creep resistance and shock resistance and energy absorption, magnesium alloys have broad application prospects in the fields of national defense, aerospace, and automobile manufacturing. It is well known that traditional Mg-Al-Zn and Mg-Zn-Zr alloys have low strength, although in these alloys, by adding rare earth elements (Ce, La, Nd and Y), by forming a stable second Phase, so that this type of magnesium alloy has high strength and good creep resistance at 200 °C and above. When the working temperature reaches 250 °C and above, the mechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 黎小辉郑开宏周楠徐静戚文军
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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