Method for preparing semi-solid alloy rheological slurry or billet through annular-gap type electromagnetic stirring

Abstract

A method for preparing semi-solid metal or alloy slurry or billet through annular-gap type electromagnetic stirring is hereinafter referred to as an annular-gap type electromagnetic stirring method in which the liquid metal or alloy liquid with 5-100 DEG C higher than the liquidus temperature is cast in an annular gap formed between an inner side wall of a slurrying chamber and an outer wall of an internal cooling controller. The metal or the alloy liquid is strongly stirred under the action of an electromagnetic induction rotary stirrer. Meanwhile, the cooling medium flowing in an external cooling controller and the internal cooling controller lead the temperature field of the slurry to be more uniform, thereby obtaining the fine and uniform semi-solid structure. The method is characterized in that the width of the annular gap formed between the inner side wall of the slurrying chamber and the outer wall of the internal cooling controller is 3-100mm. During preparation, the cooling medium is flowed in the external cooling controller and the internal cooling controller so as to lead the temperature field of the slurry to be uniform. The preparation method leads the stirring force field and the temperature field of the slurry to be more uniform, thereby obtaining the high-quality semi-solid slurry. The method has the advantages of simple preparation process, convenient operation, excellent shape of the semi-solid structure, uniformity and fineness and low preparation cost, and is particularly applicable to preparation of semi-solid aluminum or aluminum alloy, magnesium and magnesium alloy and other metal and alloy or composite material slurry or billet.

Description

technical field [0001] The invention belongs to the technical field of semi-solid metal processing, and relates to a method for preparing semi-solid metal or alloy slurry or blank. Suitable for preparing semi-solid metal or alloy slurries or billets. Background technique [0002] Since Professor Flemings of the Massachusetts Institute of Technology invented the semi-solid metal forming technology in the 1970s, the preparation and forming technology of semi-solid metal paste as a new technology immediately attracted widespread attention from all over the world. A lot of manpower, material and financial resources have been invested in the research and development of this technology. At present, many metal slurry preparation methods have been invented, mainly including electromagnetic stirring method; mechanical stirring method; deformation and strain activation method; ultrasonic vibration method; spraying Deposition method, single / double spiral stirring method; low superheat...

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Problems solved by technology

However, when using this method to prepare semi-solid metal slurry, although a strong composite electromagnetic stirring technology is used to help the flow of the semi-solid alloy slurry, the inhomogeneity of the temperature field of the slurry and the inhomogeneity of the slurry structure Still noticeably present, inability to produce good quality semi-solid alloy slurries or billets

[0005] In short, in the equipment and methods for preparing semi-solid metal and alloy slurry or billet by electromagnetic stirring method at home and abroad, even if various measures such as low-frequency stirring are adopted, due to the existence of the skin effect and the inherent heat dissipation characteristics of the slurry, There are still large inhomogeneities in the temperature field distribution and tissue distribution of the slurry, and it is difficult to produce high-quality semi-solid slurry or billet, which limits the further development and application of this technology

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