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Production of semi-solid aluminium alloy size

A semi-solid, aluminum alloy technology, applied in the direction of chemical instruments and methods, mixers, dissolution, etc., can solve the problems of preparation efficiency and preparation cost limitations, inability to apply large-scale production, limited grain refiners, etc., to achieve shortening Pulping time, improvement of preparation efficiency, effect of inhibiting dendrite

Inactive Publication Date: 2007-08-22
TSINGHUA UNIV
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Problems solved by technology

This method has relatively large limitations, one is that the suitable grain refiner is extremely limited, and the other is that the preparation process is long and the efficiency is low
[0007] Low superheat casting, also known as (near) liquidus casting, is through low superheat pouring and overall pressurization effect, so that the entire alloy liquid enters a supercooled state at the same time, and realizes simultaneous nucleation and simultaneous growth, but it can only be used For the forming of simple 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 (including single and double air flow atomization, high-speed rotary cylinder atomization, electro-hydrodynamic atomization, etc.), etc., but are all limited by the preparation efficiency and preparation cost, and cannot be used in large-scale production

Method used

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  • Production of semi-solid aluminium alloy size

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Embodiment A356

[0036] The preparation of embodiment A356 alloy semi-solid slurry

[0037] First, the A356 alloy ingot is melted in a resistance furnace. The temperature of the A356 alloy melt is 640°C±5°C, and the holding time is 30 minutes to ensure that the temperature of the melt is uniform; while the melt is keeping warm, the stirring crucible is preheated to 400 ℃. Then turn on the electromagnetic stirrer, and after about 10 seconds, pour the A356 alloy melt that has been kept at low temperature into the stirring crucible, put the crucible into the inner cavity of the electromagnetic stirrer, and start electromagnetic stirring. Electromagnetic stirring process parameters are as follows: forward-reverse non-intermittent two-way stirring, pouring temperature T 0 =640°C, stirring frequency f=30Hz, output voltage U=220V, one-way stirring time Δτ=5s. The temperature of the slurry is collected in real time during the stirring process, and the stirring is stopped when the temperature drops t...

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Abstract

The invention provides to produce the semi-solid alloy slurry using the electromagnetic stirring method. First, prepare the low degree of the superheat fusant and keep the temperature of it; then, prepare the semi-solid slurry in the stirring pot; when the temperature is below the liquid line 5-10 Deg C., we can stop the stirring and get the product. The process can give us the uniform solid phase of the semi-solid alloy.

Description

technical field [0001] The invention relates to a method for preparing semi-solid alloy slurry by an electromagnetic stirring method, which is suitable for low-melting-point alloys such as aluminum alloys. Background technique [0002] Semi-solid alloy slurry is an essential raw material for semi-solid forming. The basic requirement of the semi-solid alloy slurry is that the solid phase in it is fine, round and non-dendritic, with uniform size and uniform distribution. There are many technologies and processes for preparing semi-solid aluminum alloy slurry, but there are few reports on technologies and processes that can achieve rapid online preparation. [0003] In the existing semi-solid alloy slurry preparation technology, according to the preparation principle, it is mainly divided into several methods such as using external force, adding inoculant, controlling cooling rate, heating and heat preservation, and low superheat casting. The method of using external force is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/08B01F13/08
Inventor 唐靖林冯鹏发曾大本
Owner TSINGHUA UNIV
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