Method for preparing amorphous magnesium alloy by using impact or explosion method

Abstract

The invention relates to alloy preparation, in particular to a method for preparing an amorphous magnesium alloy by using an impact or explosion method, which comprises the following steps: isolating the front and back surfaces of a magnesium alloy to be processed from an explosive by using an isolating plate and an isolating column, and integrally clamping and sinking the magnesium alloy and the explosive into a sinking pit by using a clamp. And the lead triggering device is connected with the explosive, and remote control is realized. According to the method, high-temperature and high-pressure conditions generated by shock waves or explosion are utilized, and a rapid cooling technology is combined, so that the magnesium alloy plate, the magnesium alloy belt and the magnesium alloy block material form an amorphous structure, and the amorphous magnesium alloy with excellent mechanical properties is obtained. The method can improve the strength and plasticity of the alloy, and is suitable for a multi-component alloy system.

Description

Technical Field

[0001] The invention relates to the preparation of alloys, and in particular to a method for preparing amorphous magnesium alloys by using impact or explosion methods. Background Art

[0002] Amorphous magnesium alloys have broad application prospects in aerospace, biomedicine, electronic devices and other fields due to their high strength, low density, excellent corrosion resistance and biocompatibility. Traditional methods for preparing amorphous magnesium alloys include rapid solidification belt spinning method, powder metallurgy method, mechanical ball milling method, surface modification method, etc. Rapid solidification belt spinning method is a common method for preparing amorphous magnesium alloys. CN 103305709 A patent adopts a method of rapidly cooling the magnesium alloy melt to achieve the formation of an amorphous structure. The typical steps include melting the alloy raw material to 700-800°C in a vacuum induction furnace, and then rapidly cooling it using a belt spinning machine to obtain an amorphous alloy thin strip with a thickness of 25-35µm. . This method has a simple process and low cost, and is suitable for the preparation of small-sized materials. The disadvantage is that it is difficult to prepare large-sized block materials and the product size is limited. The powder metallurgy method prepares amorphous magnesium alloys by mechanical grinding and compaction sintering. In the patent of CN 109439984 A, the pre-alloy is first melted and mechanically ground into powder, and then cold pressed and sintered to form a bulk amorphous material. This method can prepare bulk materials with controllable shape and size, but the process is complicated and involves multiple steps such as mechanical grinding, compaction and sintering. In the patent of CN 1506482A, amorphous magnesium-based hydrogen storage electrode materials can be prepared by mechanical ball milling, and the addition of elements such as silicon, carbon, phosphorus, and aluminum can improve the hydrogen storage performance and electrochemical cycle stability of the materials. The magnesium-based nano / amorphous composite hydrogen storage material prepared by this method has a high hydrogen storage capacity and significantly improves the kinetic performance of hydrogen absorption and desorption. By surface modification methods, amorphous alloy coatings can also be prepared on the surface of magnesium alloys to improve their corrosion resistance. For example, the patent of CN107338433 A uses a cold spraying method to spray amorphous alloy powder onto the surface of magnesium alloys to form a dense amorphous coating. The coating material maintains an amorphous structure and has high corrosion resistance and high hardness. The traditional method of preparing amorphous magnesium alloys has problems such as limited sample size, complex equipment, high cost, and difficulty in controlling material uniformity. The impact or explosion method uses the instantaneous high temperature and high pressure conditions generated by high-energy shock waves or explosions to make the alloy material amorphous in a very short time. The impact or explosion method combined with rapid cooling technology can overcome the shortcomings of the traditional method of preparing amorphous magnesium alloys and provide an effective way to quickly prepare large-sized, uniform bulk amorphous magnesium alloys. This method of preparing amorphous magnesium alloys has not been reported or published. Summary of the invention

[0003] The present invention provides a method for preparing an amorphous magnesium alloy by impact or explosion, wherein the front and back sides of the magnesium alloy to be processed are isolated from the explosive by using an isolation plate and an isolation column, and the two are clamped as a whole by using a fixture, sunk into a sinking pit, and connected to the explosive by using a lead trigger device to realize remote control. The height of the explosive is between 5-185mm, and the height of the gap between the isolation plate and the magnesium alloy is between 1-20mm.

[0004] The magnesium alloy of the present invention is one of Mg-Al, Mg-Zn-Ca, Mg-Cu, Mg-Ti or Mg-Cu-Ag-Gd-Y, and the thickness of the obtained amorphous magnesium alloy is 0.1-1000 mm.

[0005] The present invention utilizes the high temperature and high pressure conditions generated by shock waves or explosions, combined with rapid cooling technology, to form an amorphous structure in magnesium alloy plates, strips, and blocks, thereby obtaining an amorphous magnesium alloy with excellent mechanical properties. This method can improve the strength and plasticity of the alloy and is applicable to multi-element alloy systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is the SEM image of the AZ31B magnesium alloy used in Example 1 before explosion impact.

[0007] Figure 2 This is the SEM image of the AZ31B amorphous magnesium alloy obtained in Example 1.

[0008] Figure 3 This is the XRD diffraction curve of the AZ31B amorphous magnesium alloy obtained in Example 1. DETAILED DESCRIPTION

[0009] The present invention is described below in conjunction with examples, which are only used to explain the present invention and are not used to limit the scope of the present invention.

[0010] Example 1

[0011] A method for preparing an amorphous magnesium alloy by impact or explosion, comprising the following operations: (1) material preparation: for a 10 mm thick AZ31B magnesium alloy plate material, select a suitable emulsion explosive with a quartz sand content of 30% and a 15 mm thick willow isolation plate; (2) charge arrangement: evenly arrange the explosive charge on the surface of the isolation plate with an explosive height of 50 mm to complete double-sided charge arrangement; (3) detonation: detonate the charge through a fuse trigger device with an explosion speed of about 1500 m / s; (4) severe deformation of the material: during the explosion, a large amount of broken crystals and amorphous structures are formed inside the metal, resulting in severe strain; (5) cooling and subsequent treatment: after the explosion is completed, the metal plate is rapidly cooled, naturally cooled, and the surface of the magnesium alloy is polished, after the explosion impact.

[0012] Figure 1This is the SEM image of the AZ31B magnesium alloy used in Example 1 before explosion impact. Figure 2 This is the SEM image of the AZ31B amorphous magnesium alloy obtained in Example 1. It can be seen that Figure 1 The large particle structure characteristics in the surface structure of AZ31B magnesium alloy, Figure 2 The microstructure after the explosion impact shows a large area of ​​amorphous blocks, while the crystal areas are distributed at the interface of the amorphous areas. The material as a whole shows stronger corrosion resistance. Figure 3 This is the XRD diffraction curve of the AZ31B amorphous magnesium alloy obtained in Example 1. The circled portion in the figure has an obvious mantou peak, indicating that more amorphous structure is produced.

[0013] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an amorphous magnesium alloy by impact or explosion method, characterized in that: Isolation plates and isolation columns are used to isolate the front and back sides of the magnesium alloy to be processed from the explosives, and the two are clamped as a whole by a fixture and sunk into a sinking pit. A fuse trigger device is used to connect the explosives to achieve remote control.

2. The method according to claim 1, characterized in that The thickness of the amorphous magnesium alloy is 0.1-1000 mm.

3. The method according to claim 1, characterized in that The magnesium alloy is one of Mg-Al, Mg-Zn-Ca, Mg-Cu, Mg-Ti or Mg-Cu-Ag-Gd-Y.

4. The method according to claim 1, characterized in that The height of the explosive is between 5 and 185 mm, and the height of the gap between the isolation plate and the magnesium alloy is between 1 and 20 mm.

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