7000 series aluminum alloy material and preparation method thereof

Abstract

The invention relates to a 7000 series aluminum alloy material and a preparation method thereof. The aluminum alloy material has alloy components of, by weight: 7.6-11.0% of Zn, 1.2-3.0% of Mg, 1.3-2.6% of Cu, 0.04-0.30% of Zr, 0.10-0.60% of Cr, no more than 0.08% of Si, no more than 0.10% of Fe, no more than 0.10% of Ti, no more than 0.15% of total other impurities (wherein the content of single other impurity is no more than 0.05%), and balance of Al. The alloy elements Zr and Cr can be added optionally or simultaneously. The materials are prepared according to the alloy composition; the raw materials are molten; in-furnace refining and standing are carried out; and the material is cast into alloy ingots with required specifications. The alloy ingots are subjected to a preferable graded uniformization process, and is forged or extruded, such that the alloy ingots are molded; the molded materials are subjected to graded solid solution treatment, and are quenched; and artificial forced aging is carried out, such that the material can be processed into parts. The microstructures of the material are uniform, and the property of the material is stable. The ultimate tensile strength of the material can be more than 750MPa. The extensibility of the material is higher than 10%. The T-L direction KIc of the material reaches 28MPam1 / 2.

Description

technical field [0001] The invention relates to a 7000 series aluminum alloy material and a preparation method thereof, belonging to the field of metal material engineering. Background technique [0002] In recent years, with the improvement of aluminum metallurgical equipment technology and basic metallurgical technology, the development trend of aluminum alloy is high purity, high performance and high alloying. There have been 600MPa grades manufactured by melting and casting technology and powder metallurgy technology. 800MPa grade aluminum alloy. However, the fracture toughness of these aluminum alloys is often unsatisfactory. A high-strength and high-toughness aluminum alloy with a tensile strength of more than 750MPa and a T-L direction KⅠc of more than 28MPam1 / 2 is invented. It is used in aerospace, nuclear industry, transportation, Sporting goods, weapons and other fields have broad application prospects. [0003] The 600MPa aluminum alloy has been applied industri...

AI Technical Summary

Problems solved by technology

However, the fracture toughness of these aluminum alloys is often unsatisfactory. A high-strength and high-toughness aluminum alloy with a tensile strength of more than 750MPa and a T-L direction KⅠc of more than 28MPam1 / 2 is invented. It is used in aerospace, nuclear industry, transportation, Sporting goods, weapons and other fields have broad application prospects

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