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Spray-formed 7xxx series aluminum alloy containing rare earth element Er and preparation method thereof

A spray forming, rare earth element technology, applied in the field of high-performance aluminum alloy material manufacturing, can solve problems such as the inability to meet the needs of high-performance aluminum alloys, and achieve the advantages of improving strength and thermal stability, optimizing microstructure, and reducing pinhole rate. Effect

Inactive Publication Date: 2015-04-29
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, a variety of spray-formed 7xxx series aluminum alloys have been developed, but they still cannot meet the needs of high-performance aluminum alloys under complex conditions, and their performance still needs to be further improved. The development of higher-performance 7xxx series spray-formed aluminum alloys is of great practical significance

Method used

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  • Spray-formed 7xxx series aluminum alloy containing rare earth element Er and preparation method thereof
  • Spray-formed 7xxx series aluminum alloy containing rare earth element Er and preparation method thereof
  • Spray-formed 7xxx series aluminum alloy containing rare earth element Er and preparation method thereof

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Effect test

Embodiment 1

[0022] Take 100 kg of industrial pure aluminum, which contains 99.7% aluminum, 0.08% iron, and 0.04% silicon; 3.8 kg industrial pure magnesium; 11.6 kg industrial pure zinc; 5.8 kg aluminum-copper intermediate alloy (50% Cu); Alloy (10% Er) 5.2 kilograms; The above-mentioned raw materials are put into the box-type resistance furnace in batches for smelting. First put the prepared aluminum material into the crucible, heat and melt it with a resistance furnace, and then add the dried Kcl+Nacl (1:1) solvent to cover it after the pure aluminum is completely melted (both preventing oxidation and adsorption slagging refining effect). When the temperature of the molten aluminum reaches 700°C, the aluminum-copper master alloy is added, and after the aluminum-copper master alloy is melted, pure zinc and pure magnesium are pressed into the bottom of the molten pool. Then add the Al-Er master alloy at 700 ° C, and use hexachloroethane (C 2 Cl 6 ) degassing agent, and cast into prefabr...

Embodiment 2

[0024] 100 kg of industrial pure aluminum, 4.0 kg of industrial pure magnesium, 12.4 kg of industrial pure zinc; 6.2 kg of aluminum-copper master alloy (50% Cu); 4.6 kg of aluminum-erbium master alloy (12% Er); put the raw materials into the box in batches It is melted in a type resistance furnace and cast into prefabricated ingots at 700-710°C. The prefabricated ingot is remelted and refined at a temperature of 800 °C, and then poured into the tundish and the guide tube, and the nitrogen gas (pressure 0.8 MPa) injected from the gas atomization nozzle is used to spray the molten aluminum flowing out of the guide tube to obtain the diameter It is a 400mm cylindrical deposition blank. The deposited billet was extruded into a 100mm extruded rod, and then solid solution treatment was carried out at 470°C / 0.5 hours in a resistance furnace, aging treatment was carried out at 125°C / 16 hours in an aging furnace, and it was air-cooled after being released from the furnace.

Embodiment 3

[0026] 100 kg of industrial pure aluminum, 3.5 kg of industrial pure magnesium, 10.6 kg of industrial pure zinc; 5.4 kg of aluminum-copper master alloy (50% Cu); 4.8 kg of aluminum-erbium master alloy (10% Er); put the above raw materials in batches It is melted in a box-type resistance furnace and cast into prefabricated ingots at 700-710°C. The prefabricated ingot is remelted and refined at a temperature of 850 °C, and then poured into the tundish and the guide tube, and the nitrogen (pressure 0.6 MPa) injected from the gas atomizing nozzle is used to spray the molten aluminum flowing out of the guide tube. A cylindrical deposition body with a diameter of 400 mm was obtained. The deposited billet was extruded into an extruded rod of 80mm, and then solid solution treatment was carried out at 465°C / 0.5 hours in a resistance furnace, aging treatment was carried out at 120°C / 20 hours in an aging furnace, and the furnace was air-cooled.

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Abstract

The invention discloses a spray-formed 7xxx series aluminum alloy containing a rare earth element Er and a preparation method thereof. The spray-formed 7xxx series aluminum alloy containing the rare earth element Er comprises the following specific components in percent by weight: 0.3-0.8% of Er, 3.0-12.0% of Zn, 1.0-4.0% of Mg, 1.5-3.5% of Cu and the balanced of Al. The preparation method comprises the following steps: preparing all elements according to the proportion of the design components of the alloy, melting, casting to prefabricate ingots, re-melting, refining, spraying forming, performing hot extrusion to prepare aluminum alloy tube materials or bar materials, and performing solid solution and aging treatment to obtain aluminum alloy products with excellent strength and elongation. According to the prepared high-strength spray-formed 7xxx series aluminum alloy, due to the added rare earth element Er, on one hand, a melt body is purified, and impurities of solid solution of the alloy are reduced, so that the structure is optimized; on the other hand, grains can be refined, strengthening phases are separated out, the strength of the alloy is improved, the tensile strength of the alloy is 680MPa, and the elongation can be up to 15%.

Description

technical field [0001] The invention relates to the technical field of manufacturing high-performance aluminum alloy materials, in particular to a spray-formed 7xxx series aluminum alloy containing rare earth element erbium and a preparation method thereof. Background technique [0002] The 7xxx series aluminum alloy is a kind of high-strength and high-toughness aluminum alloy material developed and developed on the background of aerospace materials. It has high tensile strength and can maintain high toughness and corrosion resistance. Transport and other industrial sectors have always played an important role. Increasing the content of zinc in 7xxx series aluminum alloys can effectively improve the overall performance of the material, but if the large-size 7xxx series aluminum alloy ingots are produced by casting, serious composition segregation and thermal cracking are prone to occur, so advanced spraying can be used forming technology. [0003] Spray forming technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02B22F3/115C22F1/053
Inventor 孙顺平李小平王洪金于赟仓宁宁
Owner JIANGSU UNIV OF TECH
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