Ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy and method for manufacturing same

An alloy and alloy ingot casting technology, which is applied in the field of ultra-high strength and high elongation Al-Zn-Mg-Cu alloy and its preparation, can solve the problems of low elongation, achieve high elongation, low raw material cost, and industrial application prospects broad effect

Active Publication Date: 2013-07-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, among the ultra-high-strength alloys announced at home and abroad, the strength reaches more than 700MPa and the elongation is lower than 10%.
For a long time, researchers have tried to improve the compreh

Method used

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  • Ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy and method for manufacturing same
  • Ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy and method for manufacturing same
  • Ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Prepare an alloy according to the nominal composition Al-10Zn-2.0Mg-1.2Cu-0.12Zr (weight percentage, %), in which copper and zirconium elements are added in the form of aluminum-copper and aluminum-zirconium master alloys respectively.

[0026] 2) Wash the prepared raw materials with alcohol and blow dry. Put pure aluminum into a resistance furnace with a temperature of 780°C, and keep the temperature for 30 minutes after melting the aluminum; add aluminum-copper master alloy and aluminum-zirconium master alloy, keep the temperature for 10 minutes; add pure zinc, keep the temperature for 15 minutes; use CCl 6 Degassing, holding for 5min; adding pure magnesium, holding for 5min; using CCl 6 Degassing, heat preservation for 5min; power off the slag, when the melt temperature drops to 720℃, pour the melt into a cylindrical iron mold of Ф100mm at a speed of 1kg / min, thereby obtaining Al-Zn-Mg-Cu Alloy ingots.

[0027] 3) Put the ingot cooled to room temperature into th...

Embodiment 2

[0033] 1) Prepare an alloy according to the nominal composition Al-10Zn-1.9Mg-1.1Cu-0.14Zr (weight percentage, %), in which copper and zirconium elements are added in the form of aluminum-copper and aluminum-zirconium master alloys respectively.

[0034] 2) Wash the prepared raw materials with alcohol, dry them, put the high-purity aluminum into a resistance furnace with a temperature of 780°C, and keep the aluminum for 30 minutes after melting; Pure zinc, keep warm for 15min; use CCl 6 Degassing, holding for 5min; adding pure magnesium, holding for 5min; using CCl 6 Degassing, heat preservation for 5min; power off the slag, when the melt temperature drops to 720℃, pour the melt into a cylindrical iron mold of Ф100mm at a speed of 1kg / min, thereby obtaining Al-Zn-Mg-Cu Alloy ingots.

[0035] 3) Put the ingot cooled to room temperature into the resistance furnace, heat it to the primary annealing temperature of 400°C at a heating rate of 10°C / min and keep it for 4 hours, and ...

Embodiment 3

[0041] 1) Prepare an alloy according to the nominal composition Al-10Zn-2.1Mg-1.2Cu-0.12Zr (weight percentage, %), in which copper and zirconium elements are added in the form of aluminum-copper and aluminum-zirconium master alloys respectively.

[0042] 2) Wash the prepared raw materials with alcohol, dry them, put the high-purity aluminum into a resistance furnace with a temperature of 780°C, and keep the aluminum for 30 minutes after melting; Pure zinc, keep warm for 15min; use CCl 6 Degassing, holding for 5min; adding pure magnesium, holding for 5min; using CCl 6 Degassing, heat preservation for 5min; power off the slag, when the melt temperature drops to 720℃, pour the melt into a cylindrical iron mold of Ф100mm at a speed of 1kg / min, thereby obtaining Al-Zn-Mg-Cu Alloy ingots.

[0043] 3) Put the ingot cooled to room temperature into the resistance furnace, heat it to the primary annealing temperature of 400°C at a heating rate of 10°C / min and keep it for 4 hours, and ...

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Abstract

The invention discloses ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy and a method for manufacturing the same, and belongs to the technical field of metal alloy. The alloy mainly comprises, by mass, from 9.7% to 10.3% of Zn, from 1.7% to 2.3% of Mg, from 1% to 1.3% of Cu and from 0.11% to 0.14% of Zr; contents of other impurity elements in the alloy are not higher than 0.1%; and a relation of mass fraction ratios of Zn elements, Mg elements and Cu elements in the alloy meets inequalities of 4.5</=(Zn+0.8XCu)/Mg</=6.5, 0.4</=Cu/Mg</=0.6 and 8.5</=[Zn+0.8XCu)/Mg]/(Cu/Mg)</=10.5. The ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy and the method have the advantages that the tensile strength sigma b of the alloy is higher than or equal to 720Mpa, the yield strength sigma 0.2 of the alloy is higher than or equal to 670Mpa, and the elongation delta of the alloy is higher than or equal to 11%; the alloy is manufactured by means of homogenizing annealing, extrusion, solution hardening and T6 artificial ageing treatment in a traditional casting mode; a procedure is simple, the ultrahigh-strength and high-elongation Al-Zn-Mg-Cu alloy is low in cost and excellent in comprehensive performance, and service requirements of the modern aviation industry and the automobile industry on materials are met.

Description

technical field [0001] The invention belongs to the field of novel alloy materials, in particular to an ultra-high strength and high elongation Al-Zn-Mg-Cu alloy and a preparation method thereof. Background technique [0002] Aluminum alloy has the characteristics of high specific strength, good forming and processing performance, and good corrosion resistance, making it a very important aircraft structural material, which occupies a large proportion of large aircraft structures. The number of cars in the world is increasing day by day, and a series of problems such as energy shortage and environmental pollution have become increasingly prominent. High-strength aluminum alloys can reduce the weight of cars while ensuring the safety performance of cars, thereby reducing energy consumption and environmental pollution. Aluminum alloys have broad application prospects in the automotive industry and aviation industry, especially ultra-high-strength aluminum alloys, which play a p...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22F1/053
Inventor 陈子勇张孝雷徐万峰聂祚仁
Owner BEIJING UNIV OF TECH
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