Method for preparing semisolid alloy through centrifuging and chilling

Abstract

The invention relates to a semisolid alloy preparation method, in particular a method for preparing a spherical primary crystal semisolid alloy through centrifuging and chilling. The method comprises the following steps of: first, melting the alloy to a certain temperature; and then pouring the melt in a centrifugal barrel; throwing the melt to the inner wall of a chilling barrel after rotating the melt through centrifugal force; carrying out mixed convection on the melt in the centrifugal barrel under the double effects of centrifugal force and chilling force; and finally, obtaining a non-dendritic semisolid alloy blank or slurry with spherical or granular primary phase under the mutual effect of numerous nucleation and dendrite breaking of the outer barrel. The method for preparing the spherical primary crystal semisolid alloy through centrifuging and chilling, provided by the invention, has the characteristics of simple equipment, high production efficiency, wide application range of alloy, fine and rounded primary phase with semi-solid structure and the like, and can be used for the preparation and molding production of the metal semisolid alloy.

Description

technical field [0001] The invention belongs to the technical field of semi-solid metal processing, and in particular relates to a method for preparing a semi-solid alloy by centrifugal chilling. Background technique [0002] Since Professor Flemings created the concept, theory and technology of semi-solid metal forming in the 1970s, semi-solid metal processing technology has attracted extensive attention from the international materials community and has become one of the most active research fields today. This method can not only reduce costs, improve casting quality and yield, but also has the advantages of high efficiency, energy saving and environmental protection. At present, some developed countries have begun to apply it in the fields of automobile manufacturing, communications, electrical appliances, computers and their auxiliary equipment, aerospace and other fields, and have broad development prospects. Metal and alloy semi-solid forming technology is generally ...

AI Technical Summary

Problems solved by technology

The mechanical stirring method has the following disadvantages: 1) The life of the stirring chamber and the stirring rod is not long, the metal is more likely to be oxidized and polluted, and the internal quality of the metal is very low; 2) There is a dead angle of stirring, which affects the uniformity of the slurry; 3) The equipment is heavy and difficult to operate Difficult, low production efficiency, solid phase fraction can only be limited in the range of 30% to 60%

These methods are currently in the stage of laboratory research and have not yet been put into industrial production.

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