High-iron hypereutectic aluminum-silicon alloy and preparation method thereof

Abstract

The invention discloses a high-iron hypereutectic aluminum-silicon alloy and a preparation method thereof and relates to the field of aluminum-silicon alloy materials. The high-iron hypereutectic aluminum-silicon alloy comprises the following components, by weight, of 15% of silicon, 3% of iron, 1.8% of manganese, 0-3% of copper, 0-0.5% of magnesium, 0-0.045% of phosphorus and the balance aluminum. According to the preparation method of the high-iron hypereutectic aluminum-silicon alloy, intermediate alloys are melted firstly, then the intermediate alloys are melted together in proportion, and finally through the heat treatment process, the alloy with the tensile strength being much higher than the strength of an Al-15wt.% Si comparison specimen is obtained. The hardness is greatly improved compared with the hardness before strengthening deterioration, the average hardness of 87.2 HB can be obtained, and the uniformity of alloy materials is also good, so that the high-iron aluminum-silicon alloy with the mechanical property being close to or even better than that of an aluminum-silicon alloy without iron or with low-content iron is obtained, and important effects and significance are achieved for changing the current situation that an aluminum alloy with the iron content exceeding the standard is difficult to recycle.

Description

technical field [0001] The invention relates to the field of aluminum-silicon alloy materials, in particular to a high-iron hypereutectic aluminum-silicon alloy and a preparation method thereof. Background technique [0002] Aluminum-silicon alloy is a forging and casting alloy with aluminum and silicon as the main components. In the existing aluminum-silicon alloy, the iron-rich phase is often regarded as a harmful impurity. In order to improve the performance of the alloy, the existing technology usually The method used is to change or remove the iron-rich phase by changing the cooling rate, adding a neutralizing agent, overheating the melt, adding a modifier, diluting, precipitating, filtering, centrifuging, electromagnetically removing, etc., but this method is easy to cause iron content Aluminum alloys that exceed the standard are expensive to recycle and difficult to recycle. Contents of the invention [0003] The purpose of the present invention is: aim at the defi...

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Problems solved by technology

[0002] Al-Si alloy is a forging and casting alloy mainly composed of aluminum and silicon. In existing Al-Si alloys, the iron-rich phase is often regarded as a harmful impurity. In order to improve the performance of the alloy, the existing technology usually The method used is to change or remove the iron-rich phase by changing the cooling rate, adding a neutralizing agent, overheating the melt, adding a modifier, diluting, precipitating, filtering, centrifuging, electromagnetically removing, etc., but this method is easy to cause iron content Exceeding the standard aluminum alloy recycling cost is high and difficult to recycle

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