Metallic materials for rheocasting or thixoforming and method for manufacturing the same

A metal raw material, thixoforming technology, applied in rheological casting or thixoforming metal raw material and its manufacturing field, can solve the problems of reducing cooling rate, increasing process time, etc.
CN1485452AInactive Publication Date: 2004-03-31洪 俊杓
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
洪 俊杓
Publication Date
2004-03-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for manufacturing a metallic material for rheocasting or thixoforming and a metallic material formed using the method are provided. The method includes: applying an electromagnetic field to a vessel and loading a molten metal into the vessel; and cooling the molten metal to form a metallic material for rheocasting or thixoforming. The entire volume of molten metal is rapidly and uniformly cooled throughout, from the wall toward the center of the vessel, without generating latent heat caused by the formation of solidification layers at the early stage of cooling. The molten metal in the vessel is cooled rapidly below its liquidus temperature within 1-10 seconds after the loading of the molten metal into the vessel, so that numerous uniform crystal nuclei are created throughout the entire volume of molten metal to form a metallic material having uniform, micro, spherical particles.
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Description

technical field

[0001] The present invention relates to, and in particular to, a metallic material for rheocasting or thixoforming and a method for its manufacture. Background technique

[0002] Semi-solid or semi-melton metalworking combines casting and forging processes, and can be further divided into two types - rheocasting and thixoforming. In the rheocasting process, the finished product is directly cast from a slurry prepared from a semi-solid state. In the thixotropic forming process, a billet that has been formed from its semi-solid state is reheated to a half-molten state and then forged or die-cast into a finished product.

[0003] Metal slurries for rheocasting or thixoforming are derived from a metal feedstock containing appropriate proportions of solid particles suspended in a liquid phase in the semi-solid temperature range, and are then transformed by their thixotropic properties into a It can easily change its shape with a small force, and then cast it wit...

Claims

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