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High-intensity hypereutectic aluminum-silicon alloy

A eutectic aluminum-silicon and aluminum-silicon alloy technology, applied in the field of aluminum alloys, can solve the problems of low material strength, large gap, poor plasticity, etc.

Inactive Publication Date: 2014-07-02
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since crystalline Si is a hard and brittle phase, these existing forms of Si will cause the material to produce stress concentration at the sharp corners of needle-like eutectic Si or coarse eutectic Si under stress, resulting in low-stress brittle fracture of the material. low, poor plasticity
Adding other alloying elements, such as Cu, Mg, etc., to the hypereutectic aluminum-silicon alloy, although the strength of the alloy is improved, due to the inherent defects in the form of Si, the strength of the hypereutectic aluminum-silicon alloy is still relatively low compared with other aluminum-silicon alloys. big gap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: A high-strength hypereutectic aluminum-silicon alloy, which is melted in a crucible resistance furnace, Si in the alloy is added in the form of industrial pure silicon, Cu is added in the form of electrolytic copper, and Mg is added in the form of pure magnesium Adding, Sr is added in the form of Al-Sr master alloy, Ti and B are respectively added in the form of Al-Ti and Ti-B master alloy, and the alloy melt is poured into the metal mold at 750°C. The alloy composition is Si: 16%, Cu: 3.0%, Ti: 1.3%, B: 0.60%, Mg: 0.45%, Sr: 0.04%, the total amount of impurities is 0.34%, and the balance is Al. The as-cast alloy is made into a tensile sample according to GB / T228 "Metallic Material Tensile Test at Room Temperature", and the strength test value of the alloy is: , elongation: . After the alloy is quenched in water at 500±5°C for 3 hours and aged at 170±5°C for 6 hours, the strength test value is: , elongation: .

Embodiment 2

[0009] Example 2: A high-strength hypereutectic aluminum-silicon alloy is melted in a crucible resistance furnace. Si in the alloy is added in the form of industrial pure silicon, Cu is added in the form of electrolytic copper, and Mg is added in the form of Al- Mg is added in the form of master alloy, Sr is added in the form of Al-Sr master alloy, Ti and B are added in the form of Al-Ti-B master alloy, and the alloy melt is poured into graphite mold at 740°C. The alloy composition is Si: 17.5%, Cu: 4.2%, Ti: 1.4%, B: 0.64%, Mg: 0.65%, Sr: 0.02%, the total amount of impurities is 0.40%, and the balance is Al. The as-cast alloy is made into a tensile sample according to GB / T228 "Metallic Material Tensile Test at Room Temperature", and the strength test value of the alloy is: , elongation: . After the alloy is quenched in water at 500±5°C for 5 hours and aged at 170±5°C for 8 hours, the strength test value is: , elongation: .

Embodiment 3

[0010] Example 3: A high-strength hypereutectic aluminum-silicon alloy is melted in a crucible resistance furnace. Si in the alloy is added in the form of industrial pure silicon, Cu is added in the form of electrolytic copper, and Mg is added in the form of Al- Mg is added in the form of master alloy, Sr is added in the form of Al-Sr master alloy, Ti and B are added in the form of Al-Ti-B master alloy, and the alloy melt is poured into graphite mold at 760°C. The alloy composition is Si: 18.5%, Cu: 5.0%, Ti: 2.5%, B: 1.1%, Mg: 0.60%, Sr: 0.06%, the total amount of impurities is 0.50%, and the balance is Al. The as-cast alloy is made into a tensile sample according to GB / T228 "Metallic Material Tensile Test at Room Temperature", and the strength test value of the alloy is: , elongation: . After the alloy is quenched in water at 500±5°C for 4 hours and aged at 170±5°C for 10 hours, the strength test value is: , elongation: .

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Abstract

The invention discloses a high-intensity hypereutectic aluminum-silicon alloy, which comprises the following chemical elements by weight: 16-20% of Si, 3.0-5.0% of Cu, 1.1-2.5% of Ti, 0.5-1.1% of B, 0.45-0.65% of Mg, 0.02-0.06% of Sr, not more than 0.50% of total amount of impurities, and the balance of Al. According to the high-intensity hypereutectic aluminum-silicon alloy provided by the invention, under the conventional conditions of a production process, a cast microstructure of the alloy comprises a tiny Si phase, and the intensity and the coefficient of elongation are remarkably higher than the conventional hypereutectic aluminum-silicon alloy.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys and relates to a high-strength hypereutectic aluminum-silicon alloy. Background technique [0002] Compared with other aluminum-silicon alloys, hypereutectic aluminum-silicon alloy has good dimensional stability and wear resistance in use due to its high silicon content, low alloy density, and low thermal expansion coefficient. At present, under conventional production technology conditions, the Si element in the hypereutectic aluminum-silicon alloy exists in the form of needle-like eutectic Si or in the form of coarse eutectic Si. Since crystalline Si is a hard and brittle phase, these existing forms of Si will cause the material to produce stress concentration at the sharp corners of needle-like eutectic Si or coarse eutectic Si under stress, resulting in low-stress brittle fracture of the material. Low, poor plasticity. Adding other alloying elements, such as Cu, Mg, etc., to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02
Inventor 郭建黄小婷武晓霞
Owner ZHONGYUAN ENGINEERING COLLEGE