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Fast production of subsphaeroidal crystal tissue semi-solid aluminium alloy

A semi-solid, aluminum alloy technology, which is applied in the field of rapid preparation of spherulite semi-solid alloy slurry, can solve the problems such as the limitation of the forming efficiency by the pulping efficiency, and achieve the effects of shortening the preparation time, improving the stirring efficiency and suppressing the dendrite.

Inactive Publication Date: 2007-07-18
TSINGHUA UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to directly start from the thermodynamic and dynamic conditions of promoting grain nucleation and controlling grain growth, and adopt the composite new technology of "melt treatment + two-way electromagnetic stirring" to solve the problem of rheological deformation in the past. The problem that the pulping efficiency limits the forming efficiency in the technology realizes the on-line preparation of the semi-solid slurry, thus providing the possibility of a new rheological forming technology that realizes the separation of pulping and forming

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  • Fast production of subsphaeroidal crystal tissue semi-solid aluminium alloy

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Embodiment

[0042] Embodiment The preparation of semi-solid A356 aluminum alloy with spherulite structure

[0043] First, the A356 alloy ingot is melted in a resistance furnace, and the temperature of the A356 alloy melt is 700-720°C. Then, carry out melt treatment to alloy liquid, and melt treatment process is as follows (take the Al-5Ti-B that average particle size is less than 100 μm as example): the alloy melt in the melting furnace is transferred to resistance holding furnace 1 (high temperature with ladle) Furnace), 700 ~ 720 ℃ heat preservation, add 0.04wt% Sr Al-10Sr extruded rod and stir, then heat preservation and stand for 10min; then transfer the crucible containing the alloy melt to resistance heat preservation furnace 2 (low temperature furnace), The temperature is kept at 640°C±5°C, and 0.03wt% Ti (Al-5Ti-B powder) is added using a special rotary blowing device. It depends on the amount and refinement dose (5kg charge needs 3 minutes); finally keep it in a low-temperature ...

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Abstract

A prepared method of semi-solid spherocrystal A-alloy is to treating the alloy fusant by the process of 'refining after metamorphism' or 'metamorphism after refining'; preparing the semi-solid by the reversible electromagnetic stirring; monitoring the temperature while stirring until the temperature is under the liquid phase 3-5 Deg C., then cooling and geting the product. The efficient of the process has been improved more greatly than the traditional one, and the alloy has been more available crystal nucleus.

Description

technical field [0001] The invention relates to a rapid preparation method of a semi-solid alloy slurry with a spherulite structure, which is one of the key technologies for new semi-solid rheological forming, and ensures that the preparation efficiency is consistent with the follow-up forming process (pressure casting or die forging). Suitable for low melting point alloys such as aluminum alloys. Background technique [0002] Semi-solid alloy forming technology is usually divided into rheological forming and thixoforming two categories. Due to the application of thixoforming technology, it is exposed that the process flow is long, the billet cost is high (the billet cost accounts for about 40% of the part cost), the remelting energy consumption is high, the billet surface is oxidized seriously, and the billet loss is serious during the heating process (loss Up to 10%), production waste cannot be recycled at the production site and many other problems. Since the 1990s, rheo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/00B22D21/04C22C45/08
Inventor 唐靖林冯鹏发曾大本
Owner TSINGHUA UNIV
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