Large-sized, high-strength and high-toughness 7000 series aluminum alloy round cast ingot and preparation method thereof

A high-strength, high-toughness, aluminum alloy technology, applied in the field of 7000 series aluminum alloy round ingots and their preparation, can solve problems such as poor strength and fracture toughness, and achieve the advantages of increasing strength, reducing flux usage, and improving melt purification effect. Effect

Active Publication Date: 2018-11-23
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of poor strength and fracture toughness of existing large-scale 7000-series aluminum

Method used

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  • Large-sized, high-strength and high-toughness 7000 series aluminum alloy round cast ingot and preparation method thereof
  • Large-sized, high-strength and high-toughness 7000 series aluminum alloy round cast ingot and preparation method thereof
  • Large-sized, high-strength and high-toughness 7000 series aluminum alloy round cast ingot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0069] Specific Embodiment 1: In this embodiment, the large-scale 7000 series high-strength aluminum alloy round ingot is composed of Si≤0.01%, Fe≤0.01%, Cu: 1.9%-2.5%, Mn: 0.2%-0.6%, Mg: 1.8% ~2.5%, Cr: 0.03%~0.05%, Zn: 8.4%~9.4%, Ti≤0.10%, Zr: 0.15%~0.22%, Sb: 0.03%~0.05%, Be: 0.00045%~0.0012%, Na The total amount of +Li+K≤5ppm and the balance of Al are made.

[0070] The mechanical properties of Al-Zn-Mg-Cu alloys mainly depend on the content of Zn and Mg, and MgZn with remarkable strengthening effect can be formed. 2 Phase, as the content of Zn and Mg increases, the strength of the alloy increases significantly, and the tensile strength and heat treatment effect generally increase accordingly. However, its resistance to stress corrosion and exfoliation corrosion will decrease accordingly.

[0071] The present invention can further increase the strength of the alloy and improve the castability of the alloy by appropriately adding the microalloying element Mn element, appr...

specific Embodiment approach 2

[0073] Specific implementation mode two: the preparation method of the large-scale 7000 series high-strength aluminum alloy round ingot in this implementation mode includes the following steps:

[0074] 1. By weight percentage Si≤0.01%, Fe≤0.01%, Cu: 1.9%~2.5%, Mn: 0.2%~0.6%, Mg: 1.8%~2.5%, Cr: 0.03%~0.05%, Zn: 8.4 %~9.4%, Ti≤0.10%, Zr: 0.15%~0.22%, Sb: 0.03%~0.05%, Be: 0.00045%~0.0012%, the total amount of Na+Li+K≤5ppm and the balance Al to weigh the ingredients The ingredients are aluminum ingots, copper plates, magnesium ingots, zinc ingots, electrolytic manganese metal, aluminum alloy waste, aluminum titanium boron wire, powdered aluminum zirconium master alloy, aluminum beryllium master alloy, aluminum antimony master alloy, the aluminum alloy The waste material is an aluminum alloy of the same type as the aluminum alloy to be prepared; the aluminum ingot is a refined aluminum ingot;

[0075] 2. Sprinkle a layer of flux evenly on the bottom of the smelting furnace before...

specific Embodiment approach 3

[0085] Embodiment 3: This embodiment differs from Embodiment 2 in that: the content of Fe in the refined aluminum ingot in step 1 is less than 0.005, the content of Si is less than 0.005, and the content of Na+Li+K alkali metals is less than 5 ppm. Others are the same as in the second embodiment.

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Abstract

The invention relates to a large-sized, high-strength and high-toughness 7000 series aluminum alloy round cast ingot and a preparation method thereof to solve the problems of low strength and low fracture toughness property of an existing large-sized 7000 series aluminum alloy round cast ingot. The aluminum alloy round cast ingot is manufactured by Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti, Zr, Sb, Be, Na, Li, K and the balance Al. The preparation method comprises the following steps that step 1, that raw materials are weighed; step 2, a smelt agent is laid at the bottom of a furnace before raw materialfeeding, the raw materials are added into the smelting furnace, and then the smelt agent is laid on the surface after raw material feeding; step 3, heating is conducted until the raw materials in thefurnace smelt, and then a copper plate and zinc ingot are added; step 4, smelting is carried out, and dross on the surface is removed; step 5, refining is carried out; step 6, turning down is carriedout; step 7, casting is carried out; step 8, saw cutting is carried out, and step 9, homogenizing annealing is carried out. The aluminum cast ingot manufactured section steel has high tensile strength, compression-resisting yield strength and high fracture toughness property, and is used in the field of aluminum alloy.

Description

technical field [0001] The invention relates to a 7000 series aluminum alloy round ingot and a preparation method thereof. Background technique [0002] With the rapid development of my country's aerospace industry, more stringent requirements have been put forward for basic materials. While the section size of the extruded profile is required to be increased and the length of the fixed length is lengthened, the performance of the extruded profile is required to have a higher matching of strength, toughness and corrosion resistance. Therefore, higher alloying and larger specifications of aluminum alloy round ingot blanks are required. The degree of alloying is high, the size of the ingot is large, and casting is difficult. The bottleneck problem of aluminum alloy development. [0003] At present, the Zn content of 7000 series aluminum alloys used in aerospace is between 6% and 8%, and the tensile strength of the alloy is relatively high, which can reach 600MPa. However, i...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03C22C1/06C22F1/053B22D11/18
CPCB22D11/18C22C1/026C22C1/03C22C1/06C22C21/10C22F1/053
Inventor 吕丹吕新宇王国军王金花任伟才高新宇贾宁王英君王海彬殷云霞王骁睿王殿坤袁丹丹吴晓旭韩颖雷金琴
Owner NORTHEAST LIGHT ALLOY CO LTD
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