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
CN103484736AActive Publication Date: 2014-01-01NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2014-01-01

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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.
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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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