A Al-zn-mg-cu Series Aluminum Alloy with Low Quenching Sensitivity

A quenching sensitivity, aluminum alloy technology, applied in the field of low quenching sensitivity Al-Zn-Mg-Cu aluminum alloy, can solve the problems of reduced quenching sensitivity, high density value, low alloy hardenability depth, etc. Effect of Quenching Sensitivity

Active Publication Date: 2016-01-20
CENT SOUTH UNIV
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Problems solved by technology

When the content of the main alloying elements is high, especially when the content of Zn is high, the strength of the alloy is high, but the density value is relatively high, and the hardenability depth of the alloy is low
Such as 7A09 (LC9) and 7A10 (LC10) aluminum alloys developed in China, the tensile strength at room temperature can not be lower than 510MPa, and the elongation at room temperature can not be lower than 9%, but the alloy has a high quenching sensitivity, which is for thick plate materials unfavorable
The 7085 aluminum alloy developed abroad has a high strength value and a reduced quenching sensitivity, but its high density is not conducive to reducing the quality of flight components and the requirements for energy saving and emission reduction

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  • A Al-zn-mg-cu Series Aluminum Alloy with Low Quenching Sensitivity
  • A Al-zn-mg-cu Series Aluminum Alloy with Low Quenching Sensitivity
  • A Al-zn-mg-cu Series Aluminum Alloy with Low Quenching Sensitivity

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Embodiment Construction

[0024] The present invention can adopt following 2 kinds of methods to prepare:

[0025] Method A: Select the alloy composition within the scope of the present invention. Al, Mg, and Zn are added in the form of pure Al, pure Mg, and pure Zn, and other elements are added in the form of master alloys. After smelting at a suitable temperature, stir fully, add a degassing agent (hexachloroethane) to degas, and remove slag. After the temperature drops to the casting temperature of 720-730°C, pour the alloy melt into the iron mold. After the ingot is homogenized and annealed, the head and tail are cut off, and rolling is carried out after preheating. The reduction of each pass of rolling is not more than 10%, and intermediate annealing (2-3 passes) is required. The annealing time is 15min. Due to the thinner plate, the cooling is faster in hot rolling, and in order to control the rolling precision, the rolling reduction in the final stage of rolling is less than 1mm per pass. The...

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Abstract

The present invention discloses a novel low quench sensitivity Al-Zn-Mg-Cu series aluminum alloy. The key of the present invention is to adjust the mass ratio of alloy elements in Al-Zn-Mg-Cu alloy. The Al-Zn-Mg-Cu series aluminum alloy comprises the following compositions by weight: 4.5-6.5% of Zn, 3.0-4.0% of Mg, 1.0-1.5% of Cu, 0.08-0.15% of zirconium, less than 0.06% of titanium, less than 0.3% of silicon, less than 0.3% of Fe, less than 0.15% of Mn, and the balance aluminum. The novel aluminum alloy provided by the present invention has relatively high strength, relatively good plasticity, and relatively low quench sensitivity. Materials (components) produced by the alloy of the invention has a strength greater than 530Mpa at room temperature after peak aging, elongation at room temperature of the material is not lower than 10%, Vickers hardness value is not less than 180HV, quench sensitivity is low, and overall performance is significantly higher than reported Al-Zn-Mg-Cu series aluminum alloy.

Description

technical field [0001] The invention relates to the field of non-ferrous metal materials, in particular to an Al-Zn-Mg-Cu aluminum alloy with low quenching sensitivity. The alloy can meet the peak aging room temperature strength of 530MPa, room temperature elongation of 10%, and low quenching sensitivity. Background technique [0002] With the development of the aerospace industry and the trend of international energy conservation and emission reduction, the demand for new high-performance lightweight materials in the aviation industry is increasing rapidly. The quality of aviation components and the improvement of the uniformity of component performance play a role that cannot be ignored. [0003] In recent years, more and more attention has been paid to Al-Zn-Mg-Cu series aluminum alloys. As a heat treatable aluminum alloy, the adjustment of the main alloying elements of Al-Zn-Mg-Cu aluminum alloy is closely related to the properties of the alloy. When the content of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
Inventor 邓运来杨金龙李思宇万里刘胜胆陈龙房星张新明
Owner CENT SOUTH UNIV
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