Method for improving strength and intercrystalline corrosion resisting performance of aluminum alloy

Abstract

The invention discloses a method for improving the strength and intercrystalline corrosion resisting performance of an aluminum alloy. The 6061 aluminum alloy serves as a raw material, 550 DEG C / 1h solution treatment and water quenching, 180 DEG C / 2h under ageing, 75% rolling reduction cold rolling and 100 DEG C / 48 h low-temperature re-ageing are conducted, and the aluminum alloy with the high strength and intercrystalline corrosion resisting performance is obtained. The tensile strength of the aluminum alloy is 560 MPa, the yield strength of the aluminum alloy is 542 MPa, the elongation at break is 8.5%, and the average ductility is 7%.

Description

technical field [0001] The application belongs to the field of aluminum alloy material manufacturing, and in particular relates to a method for improving the strength and intergranular corrosion resistance of aluminum alloy. Background technique [0002] Age-hardening aluminum alloy has low density, high specific strength, good corrosion resistance and plastic formability, and is an important lightweight structural material widely used in aircraft manufacturing, mainly including ultra-high strength 7000 series Al-Zn-Mg-Cu alloy (500-700MPa), high-strength 2000 series Al-Cu-Mg alloy (400-500MPa) and medium-strength 6000 series Al-Mg-Si-Cu alloy (300-400MPa), the representative alloy grades are 7075, 2024 and 6056. Compared with the 7000 series and 2000 series aluminum alloys, although the 6000 series aluminum alloys have the advantages of low material density and cost, ingot formability, plastic processing performance, excellent surface treatment performance and low tendency...

AI Technical Summary

Problems solved by technology

However, so far, the proportion of 6000-series aluminum alloys used in aircraft manufacturing is significantly lower than that of 7000-series and 2000-series aluminum alloys

The primary reason for this phenomenon is the relatively low strength of 6000 series aluminum alloys.

Although artificially aged to the peak state (T6), the strength of 6000-series aluminum alloys is still much lower than that of 7000-series and 2000-series aluminum alloys, which cannot reflect the advantages of weight reduction; at the same time, 6000-series aluminum alloys still have serious Inter-corrosion sensitivity, which seriously affects the life and safety of aircraft

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