Structural material piece of magnesium-containing silumin and method for preparing same

Abstract

Disclosed is a structure material part containing magnesium and high-silicon aluminum alloy, which comprises a profile, a rod, a plate and a forged part. The structure material part is characterized in that an ingot is prepared by the method of semi-continuous casting, then phase particles of eutectic silicon are discretized by preheating treatment, and then the ultimate form and the microstructure are obtained by hot-deforming processing and heating treatment; the structure material part contains 0.2 to 2.0 weight percent of magnesium, and 8 to 18 weight percent of silicon; and the structure material part has even and refined microstructure, for the structure of aluminum matrix is of equiaxed grains whose average size is less than 6 microns, and the silicon and other second phase particles are dispersively distributed, and the average size of the second phase particles is less than 5 microns. The structure material part containing magnesium and high-silicon deformed aluminum alloy, which has good plasticity and higher strength, can be manufactured with low cost on the premise that no modifier is added in the casting process.

Description

technical field [0001] The invention relates to an aluminum alloy and its preparation technology, and in particular provides a structural material piece of a magnesium-containing high-silicon aluminum alloy and a preparation method thereof. Background technique [0002] Al-Si alloys, especially Al-Si alloys with high silicon content, are widely used in the automotive industry and aerospace industry due to their low density, high wear resistance, high corrosion resistance and low thermal expansion coefficient. However, for the aluminum-silicon alloy prepared by the common solidification method, there are coarse massive Si particles and lath-like eutectic structure in the ingot, which makes the alloy extremely brittle, and it is difficult to further improve the solidification structure and manufacture through plastic processing. High-performance materials with various cross-sectional shapes, thus limiting the application range of alloys. Traditionally, aluminum-silicon alloys...

AI Technical Summary

Problems solved by technology

Aiming at the problem of poor deformation ability of ordinary solidified aluminum-silicon alloys, people are looking for a method of rapid solidification

However, only very small (<10mm) blocks can be obtained using the rapid solidification method, and further processing is required to manufacture large-sized parts

A typical example is prepared by powder metallurgy, but its production cost and process complexity are high

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