High-strength high-toughness corrosion-resistant Al-Cu-Mg aluminum alloy

Abstract

The invention relates to a high-strength high-toughness corrosion-resistant Al-Cu-Mg serial aluminum alloy. The key point is to regulate the mass ratio of the elements in the Al-Cu-Mg alloy. The high-strength high-toughness corrosion-resistant Al-Cu-Mg aluminum alloy comprises the following components in percentage by weight: 3.0-4.0% of copper, 0.5-1.5% of magnesium, less than 0.2% of zinc, less than 0.06% of titanium, less than 0.2% of silicon, less than 0.25% of iron, less than 1.2% of manganese and the balance of aluminum. The novel aluminum alloy provided by the invention has the advantages of higher strength, better plasticity, favorable exfoliation corrosion resistance and favorable fracture toughness. The strength of the material (component) prepared from the alloy after peak aging is greater than 480Mpa, the elongation percentage of the material at room temperature is not lower than 10%, the Vickers hardness number is not lower than 140HV, the exfoliation corrosion resistance is within the EB range, and the comprehensive properties are apparently higher than those of the reported Al-Cu-Mg serial aluminum alloy.

Description

technical field [0001] The invention relates to a novel high-strength and high-toughness Al-Cu-Mg aluminum alloy, the alloy can meet the peak aging strength of 480MPa, and the crack nucleation work per unit area (UIE) value is greater than 150N·M -1 . Non-ferrous metal materials and their processing fields. Background technique [0002] In order to achieve the purpose of saving energy, reducing weight and increasing efficiency, the demand for new high-performance lightweight materials in the manufacturing industry is growing rapidly. As a structural material for large aerospace parts, aluminum alloys play a vital role in reducing the quality of aviation components. Therefore It has received more and more attention, especially the heat treatable strengthening of Al-Cu-Mg series aluminum alloys. Al-Cu-Mg series aluminum alloys are used as large aircraft structural materials. The adjustment of the chemical composition of the main alloy elements is closely related to the micro...

AI Technical Summary

Problems solved by technology

At present, most of the Al-Cu-Mg series aluminum alloys have high Cu content (>4.0%) as the main element (such as 2x24 aluminum alloy) or low Mg content (<1.0%) (such as 2022 aluminum alloy). Poor, low strength or poor toughness

For example, the T6 tensile strength of 2022 aluminum alloy is only 435MPa, and the tearing UIE (unit crack nucleation work) is only 100N·M -1 , poor fracture toughness

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