Physical-method modification process for high-silicon aluminum alloy or other alloy containing second hard brittle phase

Abstract

The invention provides a physical-method modification process for high-silicon aluminum alloy or other alloy containing second hard brittle phase, which belongs to the field of metal materials, and solves the disadvantage that modification processes in the prior art are complex, difficult to control, pollution-causing, high in cost, unsuitable for large-scale industrial production and the like. The process comprises the steps of mixing two alloy melts different in components and temperature pro rata, forming another type of melt with required components and performing overheating treatment on the mixed melt to refine or modify a second coarse hard brittle phase contained by the melt. After the component-complementation melt temperature treatment process, the size of primary Si-phase grains in aluminum-silicon alloy containing Si of 20 percent can be stabilized at about 40 mu m while heat is preserved within 100 minutes. The process has the advantages of obviously improving the form, size and distribution of silicon particles and improving mechanical properties thereof, along with simple procedure, strong flexibility, environmental protection and no pollution, and can finally manufacture high-silicon aluminum alloy materials which can satisfy various uses and are excellent in comprehensive performance.

Description

technical field

[0001] The invention belongs to the field of metal materials, and more specifically relates to a physical modification process of high-silicon aluminum alloys or other alloys containing a second hard and brittle phase. Background technique

[0002] High-silicon aluminum alloy has many advantages such as small specific gravity, good wear resistance, heat resistance, low thermal expansion coefficient, and easy casting. Ideal material for components. Widely used in aviation, aerospace, automobile, shipbuilding, machinery and other industrial production departments. However, because the primary Si phase in the solidification structure of high-silicon aluminum alloys mostly grows in a coarse polygonal shape, it severely splits the matrix, deteriorates the performance of the material, and limits its wide application in industry. Therefore, it is necessary to change the morphology of the silicon phase in the alloy to reduce its weakening effect on the properties o...

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