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Extrusion process for preparing high-strength and high-plasticity rare earth-magnesium alloy

A technology of rare earth magnesium and high plasticity, which is applied in the field of alloy extrusion, and can solve the problems of reduced material strength and plasticity, and less precipitation of the second phase.

Active Publication Date: 2012-12-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, aiming at the problem that during the extrusion process of rare earth magnesium alloy, a large number of precipitates precipitate and grow up to form brittle phases, resulting in a decrease in material strength and plasticity, and to provide a method for preparing high-strength Extrusion method of high-plasticity rare earth magnesium alloy, the rare earth magnesium alloy prepared by the method is greatly refined, and the precipitation of the second phase is relatively small

Method used

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  • Extrusion process for preparing high-strength and high-plasticity rare earth-magnesium alloy
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  • Extrusion process for preparing high-strength and high-plasticity rare earth-magnesium alloy

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Embodiment 1

[0022] The raw material is GW103 magnesium alloy. The composition of the alloy is: Gd: 10%; Y: 3%; Zr: 0.4%, and the rest is magnesium, and the ratio is mass percentage.

[0023] The extrusion die used is an equal-channel extrusion die. For details, please refer to the patent: Patent No.: 2012100833603, a back-pressure equal-channel extrusion die. The angle between the horizontal channel and the vertical channel is 90°C. The size of the extruded sample is: 12mmx12mmx90mm. After the sample is cut, the surface is polished. The heating ring surrounding the mold is used for heating, and the temperature of the mold is controlled by a temperature controller. At the beginning, the mold heating temperature is preset at 400°C. The sample is heated in a holding furnace next to the hydraulic press, and the temperature of the holding furnace is set at 400 °C. After the temperature of the holding furnace reaches the preset temperature, the surface of the sample is coated with a layer of g...

Embodiment 2

[0026] A rare-earth magnesium alloy with the brand name GW103 is used, and the mass percentage of the alloy composition is: Gd: 10%; Y: 3%; Zr: 0.4%, and the rest is magnesium.

[0027]The extrusion die used is an equal-channel extrusion die, the angle between the horizontal channel and the vertical channel is 90°C, and the size of the extrusion sample is: 12mmx12mmx90mm. After the sample is cut, the surface is polished. The mold is heated by a heating ring surrounding the mold, and the temperature of the mold is controlled by a temperature controller. At the beginning, the mold heating temperature is preset to 400°C. The sample is heated in a holding furnace next to the hydraulic press, and the temperature of the holding furnace is set at 350°C. After the temperature of the holding furnace reaches the preset temperature, the surface of the sample is coated with a layer of graphite lubricant to reduce the friction between the sample and the mold, and the sample is put into the...

Embodiment 3

[0030] The raw material is GW103 magnesium alloy composition mass percentage: Gd: 10%; Y: 3%; Zr: 0.4%, and the rest is magnesium.

[0031] The extrusion die used is an equal-channel extrusion die, the angle between the horizontal channel and the vertical channel is 90°C, and the size of the extrusion sample is: 12mmx12mmx90mm. After the sample is cut, the surface is polished. The mold is heated by a heating ring surrounding the mold, and the temperature of the mold is controlled by a temperature controller. At the beginning, the mold heating temperature is preset to 400°C. The sample is heated in a holding furnace next to the hydraulic press, and the temperature of the holding furnace is set at 330°C. After the temperature of the holding furnace reaches the preset temperature, the surface of the sample is coated with a layer of graphite lubricant to reduce the friction between the sample and the mold, and the sample is put into the holding furnace for heating. According to m...

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Abstract

The invention discloses an extrusion method for preparing a high-strength and high-plasticity rare earth-magnesium alloy, which comprises the following steps: using an equal-channel extrusion mold as the extrusion mold, wherein the included angle between a horizontal channel and a vertical channel is 90 degrees; respectively heating the mold and a sample to be extruded, wherein the heating temperature of the sample is different from the heating temperature of the mold, and the heating temperature of the sample is lower than the heating temperature of the mold; performing fast extrusion on the heated sample in the heated mold; and shortening the extrusion process time as much as possible, and applying a back pressure to the direction in which the sample is extruded to ensure that the sample is under a three-dimensional stress. Thus, crystal grains of the rare earth-magnesium alloy prepared by the method are greatly refined, and second phases are precipitated less.

Description

technical field [0001] The invention relates to an alloy extrusion method, in particular to a rare earth magnesium alloy extrusion method. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering structural materials, and it has attracted more and more attention because of its excellent performance. Among practical materials, magnesium alloy has the lowest density (about 1.74g / cm3), high specific strength and specific stiffness, good damping performance, good machinability, good electrical and thermal conductivity, and is widely used in aviation, aerospace, automobile and communication industries. It is favored and has good industrial application prospects. However, magnesium alloy has a close-packed hexagonal structure, less slip system, poor plastic deformation ability at room temperature, and low strength, which restricts the wide application of magnesium alloy in the industrial field. In recent years, with the development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 曾小勤周银鹏李德江苏昕丁文江
Owner SHANGHAI JIAO TONG UNIV
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