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800MPa-level aluminum alloy extruded section and preparation method thereof

An extruded profile, 800mpa technology, applied in the field of metal materials, can solve the problems of difficult industrial application, cost constraints, inability to meet the application of weapons and equipment, etc., and achieve the effect of broad application prospects.

Active Publication Date: 2019-11-01
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The small-sized 800MPa aluminum alloy cannot meet the application of weapons and equipment due to the size limitation; the ultra-high-strength aluminum alloy prepared by powder metallurgy is difficult to be applied industrially due to the cost limitation

Method used

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  • 800MPa-level aluminum alloy extruded section and preparation method thereof
  • 800MPa-level aluminum alloy extruded section and preparation method thereof
  • 800MPa-level aluminum alloy extruded section and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation process steps of the alloy are as follows:

[0031] (1) The alloy ratio is Zn: 9.0%, Mg: 2.5%, Cu: 0.8%; according to the above weight percentage ingredients, 99.99% refined Al ingots, pure Zn ingots, pure Mg ingots, and Al-Cu master alloys are used;

[0032] (2) Melting in a smelting furnace, the melting temperature is 700-780°C;

[0033] (3) Adding refining agent to the completely melted metal for continuous stirring and refining, the refining is carried out in batches, and the temperature of the metal during refining is maintained within the range of 690-750°C;

[0034] (4) Vacuum standing after refining, vacuuming to 1000-1200Pa, standing time 30-35min;

[0035] (5) Start casting after fully standing, the thickness of the pure aluminum base is not less than 100mm, the casting temperature is 690-700°C, the casting speed is 15-22mm / min, and the casting pressure is controlled at 0.03-0.08MPa;

[0036] (6) casting to obtain semi-continuous ingot, ingot...

Embodiment 2

[0050] (1) The alloy ratio is Zn: 10.5%, Mg: 3.0%, Cu: 1.1%, Zr: 0.11%; according to the above weight percentage ingredients, use 99.99% refined Al ingot, pure Zn ingot, pure Mg ingot, Al -Cu master alloy, Al-Zr master alloy;

[0051] (2) Melting in a smelting furnace, the melting temperature is 700-780°C;

[0052] (3) Adding refining agent to the completely melted metal for continuous stirring and refining, the refining is carried out in batches, and the temperature of the metal during refining is maintained within the range of 690-750°C;

[0053] (4) Vacuum standing after refining, vacuuming to 1000-1200Pa, standing time 30-35min;

[0054] (5) Start casting after fully standing, the thickness of the pure aluminum base is not less than 100mm, the casting temperature is 690-700°C, the casting speed is 15-22mm / min, and the casting pressure is controlled at 0.03-0.08MPa;

[0055](6) casting to obtain semi-continuous ingot, ingot size

[0056] (7) Homogenize the ingot within...

Embodiment 3

[0068] (1) The alloy ratio is Zn: 11.0%, Mg: 3.0%, Cu: 1.1%, Sc: 0.15%; according to the above weight percentage, use 99.99% refined Al ingot, pure Zn ingot, pure Mg ingot, Al -Cu master alloy, Al-Zr master alloy;

[0069] (2) Melting in a smelting furnace, the melting temperature is 700-780°C;

[0070] (3) Adding refining agent to the completely melted metal for continuous stirring and refining, the refining is carried out in batches, and the temperature of the metal during refining is maintained within the range of 690-750°C;

[0071] (4) Vacuum standing after refining, vacuuming to 1000-1200Pa, standing time 30-35min;

[0072] (5) Start casting after fully standing, the thickness of the pure aluminum base is not less than 100mm, the casting temperature is 690-700°C, the casting speed is 15-22mm / min, and the casting pressure is controlled at 0.03-0.08MPa;

[0073] (6) casting to obtain semi-continuous ingot, ingot size

[0074] (7) Homogenize the ingot within 3 hours af...

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Abstract

The invention discloses a 800MPa-level aluminum alloy extruded section and a preparation method thereof, belongs to the technical field of metal materials, and provides a large-size 800MPa-level aluminum alloy extruded section which can be used for semicontinuous casting method preparation. The 800MPa-level aluminum alloy extruded section comprises the following components in percentage by weight:9.0-12.5% of Zn, 2.5-3.5% of Mg, 0.8-1.5% of Cu, 0.08-0.15% of Zr, 0.05-0.25% of Sc, less than or equal to 0.10% of Fe, less than or equal to 0.10% of Si, less than or equal to 0.15% of other impurities and the balance of Al, wherein the percentage of each impurity is less than or equal to 0.05%. The 800MPa-level aluminum alloy extruded section is prepared through the steps of batching the raw materials according to the alloy components, melting the raw materials, carrying out furnace refining and standing, and casting an alloy ingot with a required specification by adoption of a semicontinuous casting method; and carrying out tertiary homogenization processing and extrusion process forming in the conditions that the thickness of the extruded section is not smaller than 40mm and the widthis not smaller than 150mm, and carrying out thermal treatment for using. The novel aluminum alloy extruded section is uniform in microscopic structure and stable in performance; in the L direction, the tensile strength can be above 800MPa, the yield strength can be up to 750MPa and the ductility is higher 8%; in the the LT direction, the tensile strength can be up to 750MPa, the yield strength can be up to 700MPa and the ductility is higher than 6%; and the prepared section can be widely applied in the fields of aviation, spaceflight, nuclear industry, transportation, weapons and the like.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to an aluminum alloy extruded profile, in particular to a large-size 800MPa grade aluminum alloy extruded profile prepared by a semi-continuous casting method. Background technique [0002] With the increasingly urgent demand for ultra-light structure and low cost of future weapons and equipment, the demand for high-strength aluminum alloy materials is becoming stronger and stronger. At present, there have been small-sized 800MPa-grade aluminum alloys manufactured by semi-continuous casting technology and 800MPa-grade aluminum alloys manufactured by powder metallurgy technology in China. The small-sized 800MPa aluminum alloy cannot meet the application of weapon equipment due to the size limitation; the ultra-high-strength aluminum alloy prepared by powder metallurgy is difficult to be applied industrially due to the cost limitation. The large-size 800MPa low-cost aluminum al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 臧金鑫郝敏邢清源陈高红陈军洲何维维
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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