Aluminum alloy and casting process

Abstract

The invention relates to the technical field of aluminum alloy casting, and particularly discloses an aluminum alloy and a casting process. The aluminum alloy comprises the following components in percentage by mass: 11.2 to 12.0 mass percent of Si, 3.3 to 4.0 mass percent of Cu, less than or equal to 0.25 mass percent of Fe, 0.3 to 0.4 mass percent of Mn, 0.6 to 1.2 mass percent of Mg, 0.02 to 0.15 mass percent of Ti, 1.5 to 2.5 mass percent of Ni, 0.02 to 0.03 mass percent of Sr, less than or equal to 0.01 mass percent of Ca, less than or equal to 0.002 mass percent of P and the balance of Al. Other elements are less than or equal to 0.05 mass percent, and the balance is Al. Through the composition of the aluminum alloy and the casting process, primary silicon (the size is not more than 20 microns) is not found in any spot check, and the mechanical property, the wear resistance and the cutting machining property of the aluminum alloy are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy melting and casting, in particular to an aluminum alloy and its melting and casting process. Background technique [0002] The density of aluminum is about 1 / 3 of that of steel. It has the advantages of strong corrosion resistance, good thermal stability, good plasticity, etc., coupled with mature application technology, it is an ideal metal material for the automotive industry, and it is also the most widely used lightweight material. . [0003] Among them, the aluminum alloy with silicon as the main alloying element is mainly used in the manufacture of aluminum alloy forgings due to its high silicon content, low melting point, good melt fluidity, easy feeding, and will not make the final product brittle. . [0004] However, there are many coarse primary silicon and eutectic silicon particles in the alloy structure. These primary silicon are in the shape of thick plates or laths, general...

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Problems solved by technology

[0004] However, there are many coarse primary silicon and eutectic silicon particles in the alloy structure. These primary silicon are in the shape of thick plates or laths, generally with sharp edges and corners, and eutectic silicon also appears in the form of coarse plates or laths. Lath-shaped and unevenly distributed, which seriously reduces the mechanical properties, wear resistance and cutting performance of the alloy, and seriously affects the safety and reliability of forged pistons

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