Novel high-strength/tenacity aluminum alloy and preparation method thereof

Abstract

The invention relates to a novel high-strength / tenacity aluminum alloy and a preparation method thereof. The alloy comprises the following components in term of weight percent: 9.0-10.0% of Zn, 1.2-2.4% of Mg, 1.3-2.6% of Cu, 0.06-0.2% of Zr, 0.10-0.30% of Cr, 0.1-0.5% of V, not more than 0.08% of Si, not more than 0.10% of Fe, not more than 0.1% of Ti, not more than 0.05% of each of other impurities, not more than 0.15% of the total content and the balance Al, wherein the alloy elements Zr, Cr and V can be added selectively or simultaneously. The preparation method comprises the following steps: mixing the alloy components, smelting the raw materials, refining in a furnace and standing and then pouring to prepare an alloy ingot with the required specification, after carrying out preferential homogenization on the alloy ingot, machining and shaping the alloy ingot through forging, after preferential hot treatment, using the shaped blank for machining parts. The aluminum alloy of the invention has uniform microstructure and stable property, the ultimate tensile strength of the aluminum alloy can reach over 600MPa, simultaneously the elongation is higher than 10% and KIc in the T-L direction can reach over 28MPam1 / 2. The aluminum alloy can be applied to the structural elements in such fields as aerospace, nuclear industry, transportation, sports goods and weapons, etc.

Description

technical field

[0001] The invention is a novel high-strength and high-toughness aluminum alloy 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 600MPa and a T-L direction of 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 app...

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