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Ultrahigh strength 6000 series aluminium alloy and preparation method thereof

An ultra-high-strength, aluminum alloy technology, applied in the field of metallurgy, can solve the problems of low welding performance, plasticity and hot workability, increased production cost of alloys, difficult to dissolve, etc., to achieve inhibition of nucleation and growth, excellent strength and toughness, The effect of hindering dislocation migration

Active Publication Date: 2014-01-01
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The 6000 series aluminum alloy is an aluminum alloy with good comprehensive properties. It is widely used due to its good processing performance, corrosion resistance, weldability and decorative properties; but its strength is low, so the development of high-strength 6000 series alloys is the priority. The direction of alloy development
[0003] At present, AA6069 aluminum alloy has been developed abroad. The addition of trace V and Cr elements in the alloy can inhibit the growth of recrystallized grains and make the alloy have better strength and toughness; but because the alloy element V is difficult to dissolve in aluminum, It is difficult to control the effective addition of V element in aluminum alloy. At the same time, the addition of V increases the production cost of the alloy, which restricts the large-scale application of the alloy in industrial production.
[0004] High-strength Al-Zn-Mg-Cu alloy can be used as a structural material, but its application in the preparation of complex cross-section aluminum alloy profiles is limited due to its low weldability, plasticity and hot workability; while ordinary Al -Although the Mg-Si-Cu alloy has good plasticity and weldability, its strength is too low to meet the requirements of preparing high-strength aluminum alloy profiles with complex sections

Method used

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  • Ultrahigh strength 6000 series aluminium alloy and preparation method thereof
  • Ultrahigh strength 6000 series aluminium alloy and preparation method thereof
  • Ultrahigh strength 6000 series aluminium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Prepare pure metal aluminum, pure metal magnesium, pure metal copper, Al-Si master alloy, Al-Ti master alloy, Al-Zr master alloy, chromium additive, iron additive as raw materials according to the target composition;

[0047] Wherein the composition of Al-Si master alloy contains Si 18% by weight percentage, and the balance is Al and unavoidable impurity; The composition of Al-Ti master alloy contains Ti 30% by weight percentage, and balance is Al and unavoidable impurity; Chromium The composition of the additive contains 70% Cr by weight percentage, and the rest is salt, which does not react with Al and eventually becomes slag; the composition of the Al-Zr master alloy contains 3% Zr by weight percentage, and the balance is Al and unavoidable impurities; the iron additive The composition contains Fe 70% by weight percentage, and the rest is salt, which does not react with Al and eventually becomes slag;

[0048] Melt pure metal aluminum and Al-Si master alloy, add pure...

Embodiment 2

[0055] Method is with embodiment 1, and difference is:

[0056] The composition of the selected Al-Si master alloy contains 20% Si by weight percentage; the composition of Al-Ti master alloy contains 40% Ti by weight percentage; the composition of chromium additive contains Cr 80% by weight percentage; the composition of Al-Zr master alloy The composition contains Zr 5% by weight; the composition of the iron additive contains Fe 75% by weight;

[0057] The melt in the melting furnace is degassed with argon for 6 minutes. After the treatment, it is left to stand at 750±5°C for 12 minutes, and then the scum on the surface of the alloy melt is removed; the flow rate of argon and chlorine is 15L / min;

[0058] The composition of the obtained aluminum alloy ingot contains Si 1.21%, Mg 1.56%, Cu 1.04%, Cr 0.161%, Zr 0.148%, Fe 0.36%, Ti 0.033% by weight percentage, and the balance is Al and impurities; wherein the impurity content is according to The percentage by weight is 0.11%, a...

Embodiment 3

[0064] Method is with embodiment 1, and difference is:

[0065] The composition of the selected Al-Si master alloy contains 18% Si by weight percentage; the composition of Al-Ti master alloy contains 35% Ti by weight percentage; the composition of chromium additive contains Cr 75% by weight percentage; the composition of Al-Zr master alloy The composition contains Zr 4% by weight; the composition of the iron additive contains Fe 80% by weight;

[0066] The melt in the melting furnace is degassed with argon for 7 minutes. After the treatment, it is left to stand at 750±5°C for 14 minutes, and then the scum on the surface of the alloy melt is removed; the flow rate of argon is 10L / min;

[0067] The composition of the obtained aluminum alloy ingot contains Si 1.0%, Mg 1.54%, Cu 1.2%, Cr 0.15%, Zr 0.2%, Fe 0.4%, Ti 0.04%, and the balance is Al and impurities by weight percentage; The weight percentage is 0.11%, and the content of Zn is 0.014% by weight percentage;

[0068] Homog...

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Abstract

Ultrahigh strength 6000 series aluminium alloy and a preparation method thereof belong to the technical field of metallurgy. The ultrahigh strength 6000 series aluminium alloy comprises the following components by weight: 0.9-1.4% of Si, 1.4-1.8% of Mg, 0.9-1.3% of Cu, 0.05-0.25% of Cr, 0.05-0.25% of Zr, 0.3-0.7% of Fe, no more than 0.04% of Ti, the balance of Al and impurities, has tensile strength of 500-520 MPa, yield strength of 465-503 MPa and elongation percentage no less than 10%. The preparation method is as below: (1) preparing raw materials; (2) melting and uniformly stirring the raw materials and heating to 745-755 DEG C; (3) carrying out degassing treatment, allowing standing and removing scum; (4) carrying out semi continuous casting to obtain ingot casting; (5) carrying out homogenization treatment; (6) insulating at 400-500 DEG C for 1-2 h, and then carrying out hot extrusion deformation, mold stripping and on-line water passing to obtain a extruded bar; and (7) carrying out solid solution treatment, water quenching and artificial aging treatment in order, carrying out air cooling to room temperature to obtain an ultrahigh strength 6000 series aluminium alloy bar. According to the invention, trace elements of Zr, Cr and a proper amount of Fe are added to the aluminium alloy to gain excellent strength and toughness performance, maintain the characteristics of easy formability, good welding performance and corrosion resistance; and the ultrahigh strength 6000 series aluminium alloy is suitable for production of high-strength lightweight structural members with complex sections.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultrahigh-strength 6000 series aluminum alloy and a preparation method thereof. Background technique [0002] The 6000 series aluminum alloy is an aluminum alloy with good comprehensive properties. It is widely used due to its good processing performance, corrosion resistance, weldability and decorative properties; but its strength is low, so the development of high-strength 6000 series alloys is the priority. The direction of alloy development. [0003] At present, AA6069 aluminum alloy has been developed abroad. The addition of trace V and Cr elements in the alloy can inhibit the growth of recrystallized grains and make the alloy have better strength and toughness; but because the alloy element V is difficult to dissolve in aluminum, It is difficult to control the effective addition of V element in aluminum alloy. At the same time, the addition of V increases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C21/02C22F1/047C22F1/05
Inventor 蒙毅赵志浩崔建忠
Owner NORTHEASTERN UNIV
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