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Method for preparing semi-solid metal or alloy

A semi-solid metal and alloy technology, applied in the field of metal or alloy casting, can solve the problems of limited grain refiner, low efficiency, long preparation process, etc., to solve the problem of uneven crystal nucleus dispersion, short process flow and simple equipment Effect

Inactive Publication Date: 2019-12-31
BEIJING COMPO ADVANCED TECH
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  • Abstract
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Problems solved by technology

This method has great limitations. First, the suitable grain refiner is extremely limited. Second, the preparation process is long and the efficiency is low.
[0007] Low superheat casting, also known as near-liquidus casting, makes the entire alloy liquid enter a supercooled state at the same time through low superheat pouring and overall pressurization effect, so as to realize simultaneous nucleation and simultaneous growth, but it can only be used for simple The forming of structural parts, and the production efficiency is low
[0008] In addition, the preparation methods of semi-solid slurry include spray deposition method, deformation mutagenesis activation method, turbulent flow effect method and various powder metallurgy methods, etc., but they are all limited by preparation efficiency and preparation cost, and cannot be used in large-scale production.

Method used

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  • Method for preparing semi-solid metal or alloy

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preparation example Construction

[0023] Such as figure 1 Shown, the present invention provides a kind of preparation method of semi-solid metal or alloy, comprises the following steps:

[0024] A. Metal or alloy bulk smelting, heating the base metal or alloy to a temperature above the liquidus line, and ensuring sufficient superheat to completely melt the base metal or alloy to form a uniform liquid metal or alloy melt; B. .Cooling nucleation: cooling liquid phase metal or alloy melt to semi-solid temperature, and start to form crystal nuclei; C. High-speed emulsification dispersion: when the solid phase components including crystal nuclei in metal or alloy melt (comprising When the crystal nuclei and the dendrites growing on the crystal nuclei) reach a certain scale, the melt is continuously subjected to high-speed shear emulsification and dispersion for one or more times to realize the crushing and dispersion of the newly formed crystal nuclei in the melt. Form the crystallite nuclei whose initial motion a...

Embodiment 1

[0033] The preparation method of embodiment 1 semi-solid aluminum-copper alloy X1

[0034] Place the aluminum-copper alloy ingot in a graphite melting furnace and heat it to 700°C under the protection of a nitrogen atmosphere; after the alloy ingot is completely melted, cool it to 630°C; when the solid phase component in the alloy melt reaches 40%, the graphite The emulsification head of the high-speed shear emulsification disperser extends into the melt, turns on and gradually increases the speed to a line speed of 60m / s, and continuously breaks up the formed crystal nuclei into microcrystalline nuclei with a diameter of 50-70nm within 30 minutes. And the initial acceleration of the de-emulsification and dispersion equipment of the microcrystalline nuclei reaches 30G; then the aluminum-copper alloy melt suspension is poured into the extrusion casting mold for rheological molding, and a semi-solid aluminum alloy special-shaped casting is obtained after 60 minutes.

[0035] Tes...

Embodiment 2

[0036] Embodiment 2 The preparation method of semi-solid magnesium aluminum alloy X2

[0037] Place 2kg of magnesium-aluminum alloy ingot in a graphite melting furnace and heat it to 650°C under the protection of argon atmosphere; after the alloy ingot is completely melted, cool it to 480°C; when the solid phase component in the alloy melt reaches 60%, Extend the emulsification head of the graphite high-speed shear emulsification disperser into the melt, turn it on and gradually increase the speed to a line speed of 40m / s, break up the formed crystal nuclei into microcrystalline nuclei with a diameter of 80-100nm, and make The initial acceleration of the de-emulsification and dispersion equipment for microcrystalline nuclei is 100G; after 20 minutes of high-speed shear emulsification and dispersion, the magnesium-aluminum alloy melt suspension is poured into the mold, and the circulating water is used for rapid cooling; the cooled ingot is passed through cutting, cleaning and ...

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Abstract

The invention relates to a method for preparing a semi-solid metal or alloy. The method for preparing the semi-solid metal or the alloy comprises the following steps that a base metal or the alloy isheated to a temperature of a liquid phase line or above, and sufficient superheat is ensured to enable the base metal or the alloy to be completely melt to form a homogeneous liquid phase metal or alloy melt; the liquid phase metal or the alloy melt is cooled to a semi-solid temperature, so that crystal nucleus begin to form; when a solid-phase component reaches a certain scale, one or more continuous high-speed shearing emulsification dispersion is carried out on the melt, and the micro-crystal nucleus with an initial motion acceleration Gopt is formed in the melt to obtain a metal or alloy melt suspension; and before the metal or alloy melt suspension is agglomerated, the metal or the alloy melt suspension is prepared into the semi-solid metal or an alloy material. The method for preparing the semi-solid metal or the alloy successfully solves the problems of uneven crystal nucleus dispersion, crystal agglomeration nucleation and growth, low grain sphericity and the like in a traditional method, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of metal or alloy casting, in particular to a method for preparing semi-solid metal or alloy. Background technique [0002] The semi-solid rheological forming technology is formed by the metal or alloy melt being solidified to the solid-liquid range and directly forming parts through a certain forming process. Due to the shortening of some processing links in the material preparation process, it greatly saves the processing and manufacturing of product parts. The cost of the process has thus become a material processing method of great concern. The semi-solid forming method is used to prepare metal or alloy materials, which can realize short-process processing and manufacturing on the basis of retaining the high performance of the original metal or alloy. The application of semi-solid forming technology in aluminum, magnesium metal or alloys effectively reduces the processing temperature, reduces defects su...

Claims

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Application Information

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IPC IPC(8): B22D1/00
CPCB22D1/00
Inventor 贺会军林卓贤王志刚徐蕾刘希学刘建赵朝辉朱捷张焕鹍朱学新李志刚
Owner BEIJING COMPO ADVANCED TECH
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