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Preparation method of nano gradient magnesium alloy

A magnesium alloy and gradient technology, applied in the field of high-strength magnesium alloy preparation, can solve the problem that the fine-grain strengthening potential of magnesium alloy cannot be fully reflected

Inactive Publication Date: 2021-09-10
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, pure extrusion deformation can only refine the grain size to about 10 μm, and the fine-grain strengthening potential of magnesium alloys cannot be fully reflected.

Method used

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  • Preparation method of nano gradient magnesium alloy
  • Preparation method of nano gradient magnesium alloy
  • Preparation method of nano gradient magnesium alloy

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Embodiment Construction

[0027] Attached below Figure 1-3 The specific embodiment of the present invention is described in detail with embodiment, but the present invention should not be limited to embodiment.

[0028] A kind of preparation method of nano-gradient magnesium alloy of the present embodiment, preparation method comprises the following steps:

[0029] Step 1: adopt semi-continuous casting method to prepare magnesium alloy ingot, its magnesium alloy mass percentage composition is as follows:

[0030] Gd: 8.0-9.5; Y: 2.0-3.5; Zr: 0.3-0.7; the balance is Mg.

[0031] Step 2: Homogenize the magnesium alloy ingot.

[0032] Step 3: Squeeze and deform the homogenized billet, specifically: homogenize the semi-continuously cast magnesium alloy ingot and extrude it into a bar to form an extruded alloy. The extrusion temperature is 4350°C. The extrusion ratio is 15:1.

[0033] Step 4: Perform peak aging treatment on the extruded alloy, that is, keep it at 225° C. for 18 hours.

[0034] Step 5:...

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Abstract

The invention relates to a preparation method of a nano gradient magnesium alloy, and belongs to the technical field of high-strength magnesium alloy preparation. The method comprises the steps of: carrying out homogenization treatment on a semi-continuous casting blank and then extruding the semi-continuous casting blank into a bar, wherein the extrusion temperature ranges from 430 DEG C to 480 DEG C, the extrusion ratio ranges from 13:1 to 16:1; and firstly, carrying out peak aging treatment on an extruded alloy, carrying out heat preservation for 16-20 h at the temperature of 225 DEG C, and then carrying out surface mechanical grinding treatment SMAT at the room temperature to prepare a disc-shaped nano gradient magnesium alloy plate with the thickness ranging from 2.5 mm to 5 mm and the diameter of 49 mm, wherein the total grinding time ranges from 60 min to 120 min. According to the preparation method, the alloy strength is effectively improved, and good strength and plasticity combination is obtained.

Description

technical field [0001] The invention relates to a preparation method of a nano-gradient magnesium alloy, which belongs to the technical field of high-strength magnesium alloy preparation. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good electrical and thermal conductivity, etc., and has broad application prospects in aerospace, national defense, transportation and other fields. However, the low absolute strength and poor ductility and toughness of magnesium alloys limit its further development. Studies have found that magnesium alloys added with rare earth elements such as Gd and Y exhibit excellent solid solution strengthening and precipitation hardening effects, and can be processed in combination with deformation strengthening. There have been researches on rolling, hot extrusion and other deformation processes of Mg-Gd-Y alloys. Among them, the alloy usually exhibits a uniform and fine grain structure after ex...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22F1/06C22C23/06
CPCC22C1/02C22F1/06C22C23/06
Inventor 宁江利苑潇逸
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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