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A kind of al-42si aluminum alloy containing b and its preparation process

An al-42si, aluminum alloy technology, applied in the field of B-containing Al-42Si aluminum alloy and its preparation technology, can solve the problems of application limitation, coarse primary silicon and the like

Active Publication Date: 2019-07-02
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-silicon aluminum alloys show brittleness due to coarse primary silicon, and their applications are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Weigh 10g of Al-Si-B aluminum alloy ingot with a B content of 0.1wt% with a balance, put it into the copper crucible of a non-consumable vacuum arc furnace, and then evacuate the furnace cavity to 1×10 -4 Pa, filled with high-purity argon gas to make the pressure inside the furnace chamber reach 40 Pa, then melt the Al-Si-B alloy and suck the alloy melt into a water-cooled copper mold to prepare an alloy rod with a diameter of 5 mm and a length of 70 mm. The compressive strength is 433.7MPa, the plastic strain is 36.7%, the hardness is 55HBW, and the resistivity is 0.11μΩm.

Embodiment 2

[0011] Weigh 10g of Al-Si-B aluminum alloy ingot with a B content of 0.2wt% with a balance, put it into a copper crucible of a non-consumable vacuum arc furnace, and then evacuate the furnace cavity to 1×10 -4 Pa, filled with high-purity argon gas to make the pressure inside the furnace chamber reach 40 Pa, then melt the Al-Si-B alloy and suck the alloy melt into a water-cooled copper mold to prepare an alloy rod with a diameter of 5 mm and a length of 70 mm. The compressive strength is 580.4MPa, the plastic strain is 37.2%, the hardness is 62.7HBW, and the resistivity is 0.10μΩm.

Embodiment 3

[0013] Weigh 10g of Al-Si-B aluminum alloy ingot with 0.3wt% B content with a balance, put it into the copper crucible of a non-consumable vacuum arc furnace, and then evacuate the furnace cavity to 1×10 -4 Pa, filled with high-purity argon gas to make the pressure inside the furnace chamber reach 40 Pa, then melt the Al-Si-B alloy and suck the alloy melt into a water-cooled copper mold to prepare an alloy rod with a diameter of 5 mm and a length of 70 mm. The compressive strength is 496.7MPa, the plastic strain is 40.4%, the hardness is 77.8HBW, and the resistivity is 0.09μΩm.

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Abstract

The invention discloses B-containing Al-42Si aluminum alloy and a preparation process thereof. According to the aluminum alloy, a nonconsumable vacuum arc furnace is adopted for smelting Al-Si-B aluminum alloy ingots in the vacuum environment, aluminum alloy melt is sucked into a water-cooling copper die through a vacuum suction casting method, and the aluminum alloy is obtained. According to preparation of an Al-Si-B alloy sample, a proper number of the Al-Si-B aluminum alloy ingots are placed in a copper crucible of the nonconsumable vacuum arc furnace, a furnace cavity is vacuumized to 1*10<-4> Pa, high-purity argon is introduced so that the pressure in the furnace cavity can reach 40 Pa, then Al-Si-B alloy is melted, and alloy melt is sucked into the water-cooling copper die. The aluminum-silicon alloy is composed of, by weight, 0.1-0.3% B, 42% of Si and the balance Al, the compressive strength is 433.7-580.4 MPa, the plastic strain is 36.7-40.4%, the hardness is 55.0-77.8 HBW, and the electrical resistivity is 0.09-0.11 [mu]omega*m.

Description

Technical field [0001] The invention relates to a B-containing Al-42Si aluminum alloy and a preparation process thereof. Background technique [0002] Due to its high specific strength and hardness, low density, strong corrosion resistance and wear resistance, high-silicon Al-Si alloy, good high-temperature performance, low linear expansion coefficient, strong thermal conductivity, and low cost, it is an engine piston, precision wear-resistant parts and Ideal material for electronic packaging. However, high-silicon aluminum alloys exhibit brittleness due to coarse primary silicon, and their applications are limited. On the one hand, modification treatment is an important method to improve the morphology, size and distribution of primary silicon or eutectic silicon, and to improve the properties of high-silicon aluminum alloys. On the other hand, rapid solidification can further improve the morphology and distribution of phases in high-silicon aluminum alloys, and improve variou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03
CPCC22C1/026C22C1/03C22C21/02
Inventor 蔡安辉胡优生安琪周果君罗云李小松丁超义
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY