Method for improving structure properties of high-silicon aluminum alloy

Abstract

The invention discloses a method for improving structure properties of a high-silicon aluminum alloy. The method includes the following steps that the high-silicon aluminum alloy is obtained and put in a graphite crucible and put in a pit furnace; the temperature increasing rate and the set temperature are set, then temperature is increased, and heat preservation is performed after the temperature reaches the set temperature; then the graphite crucible is taken out and put in a low-frequency magnetic field coil, and electromagnetic and mechanical coupling stirring is performed under the condition of heat preservation; and casting is performed after stirring is finished, and the temperature is decreased to the room temperature through cooling. By means of the method for improving the structure properties of the high-silicon aluminum alloy, the size and morphology of primary silicon can be effectively improved, and the structure properties of the high-silicon aluminum alloy are improved. By means of the method, the size of primary crystal silicon of the obtained alloy is reduced, the shape is round smoothly, and meanwhile, no aggregation occurs; and the shape of the structure of eutectic silicon is changed from needle shape to worm shape or dot shape. Accordingly, the problems that separating of the alloy structure occurs due to big and thick primary crystal silicon and shape-angle primary crystal silicon, the mechanical properties of alloys are severely affected, and continuity of the substrate structure properties is affected by aggregation of primary crystal silicon are solved.

Description

technical field [0001] The invention relates to a method for improving the microstructure and properties of high-silicon aluminum alloys, and specifically belongs to the technical field of alloy manufacturing. Background technique [0002] For high-silicon aluminum alloys, as the silicon content increases, the structure of eutectic silicon and primary silicon becomes coarser, and the plasticity and toughness of the material decrease, and the brittleness increases, which causes greater difficulty in processing and forming. Therefore, adopt suitable casting methods, reduce the size and reasonable distribution of primary silicon, so as to finally produce high-silicon aluminum alloys that can meet industrial needs. The preparation process of high-silicon aluminum alloy mainly includes melting casting method, traditional powder metallurgy, spray deposition method and so on. The typical microstructure of high-silicon aluminum alloys prepared by traditional casting methods is mass...

AI Technical Summary

Problems solved by technology

With the increase of silicon content, the content of primary silicon is also higher, and it becomes coarser, and the ability to split the matrix is ​​also increasing. Stress concentration occurs at the corners and sharp parts of the silicon phase, which makes the mechanical properties of the alloy especially The elongation rate is significantly reduced, the machinability is deteriorated, and the brittleness is increased, which cannot meet the performance requirements of electronic packaging materials for aluminum-silicon alloys.

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