High-strength corrosion-resistant Al-Zn-Mg-Cu alloy added with Er and Pr and preparation method of high-strength corrosion-resistant Al-Zn-Mg-Cu alloy

A corrosion-resistant, high-strength technology, applied in the field of aluminum alloys, can solve problems such as insufficient process technology, and achieve the effect of reducing the number of grain boundaries, changing the shape and distribution, and refining grains

Active Publication Date: 2022-05-24
JIANGXI UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, at present, on high-strength and corrosion-resistant Al-Zn-Mg-Cu alloys in China, whether it is basic theory (such as new alloy design, alloy strengthening and toughening mechanism research, etc.), or process technology (such as ingot preparation technology, deformation technology, heat treatment, etc.) technology, etc.) research is not perfect

Method used

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  • High-strength corrosion-resistant Al-Zn-Mg-Cu alloy added with Er and Pr and preparation method of high-strength corrosion-resistant Al-Zn-Mg-Cu alloy
  • High-strength corrosion-resistant Al-Zn-Mg-Cu alloy added with Er and Pr and preparation method of high-strength corrosion-resistant Al-Zn-Mg-Cu alloy
  • High-strength corrosion-resistant Al-Zn-Mg-Cu alloy added with Er and Pr and preparation method of high-strength corrosion-resistant Al-Zn-Mg-Cu alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material preparation: the alloy composition includes: Zn7.49wt%, Mg2.18wt%, Cu2.45wt%, Zr0.18wt%, Er0.13wt%, Pr0.19wt%, Si≤0.1wt%, Fe≤0.1 wt%, other single impurity ≤ 0.05wt%, total impurity ≤ 0.15wt%, the rest is Al. Zn / Mg was 3.43, and the total amount of Zr+Er+Pr was 0.50. High-purity aluminum, high-purity zinc, high-purity magnesium, Al-5Zr, Al-50Cu, Al-10Er, Al-9.4Pr master alloys are used as raw materials for ingredients, and the purity of high-purity aluminum, high-purity zinc, and high-purity magnesium are all 99.9wt %.

[0028] Alloy smelting and casting: smelting in a well-type furnace, adding high-purity aluminum, Al-Zr, Al-Cu, Al-Er, Al-Pr master alloys into the furnace and raising the temperature to 740°C for melting, then adding the high-purity For zinc and high-purity magnesium, heat up to 750°C after the metal is melted, and then pass in argon for refining treatment; after refining, stir the alloy melt and let it stand at 730°C for 20 minutes, and ...

Embodiment 2

[0034] Raw material preparation: the alloy composition includes: Zn7.80wt%, Mg2.28wt%, Cu2.15wt%, Zr0.16wt%, Er0.11wt%, Pr0.16wt%, Si≤0.1wt%, Fe≤0.1 wt%, other single impurity ≤ 0.05wt%, total impurity ≤ 0.15wt%, the rest is Al. Zn / Mg was 3.42, and the total amount of Zr+Er+Pr was 0.43. High-purity aluminum, high-purity zinc, high-purity magnesium, Al-5Zr, Al-50Cu, Al-10Er, Al-9.4Pr master alloys are used as raw materials for ingredients, and the purity of high-purity aluminum, high-purity zinc, and high-purity magnesium are all 99.9wt %.

[0035] Alloy smelting and casting: smelting in a pit furnace, adding high-purity aluminum, Al-Zr, Al-Cu, Al-Er, Al-Pr master alloys into the furnace and raising the temperature to 730°C for melting, then adding the high-purity For zinc and high-purity magnesium, heat up to 745°C after the metal is melted, and then pass in argon for refining treatment; after refining, stir the alloy melt and let it stand at 730°C for 10 minutes, and remove...

Embodiment 3

[0041] Raw material preparation: the alloy composition includes: Zn7.50wt%, Mg2.30wt%, Cu2.30wt%, Zr0.22wt%, Er0.12wt%, Pr0.20wt%, Si≤0.1wt%, Fe≤0.1 wt%, other single impurity ≤ 0.05wt%, total impurity ≤ 0.15wt%, the rest is Al. Zn / Mg was 3.26, and the total amount of Zr+Er+Pr was 0.54. High-purity aluminum, high-purity zinc, high-purity magnesium, Al-5Zr, Al-50Cu, Al-10Er, Al-9.4Pr master alloys are used as raw materials for ingredients, and the purity of high-purity aluminum, high-purity zinc, and high-purity magnesium are all 99.9wt %.

[0042] Alloy smelting and casting: smelting in a well-type furnace, adding high-purity aluminum, Al-Zr, Al-Cu, Al-Er, Al-Pr master alloys into the furnace and raising the temperature to 740°C for melting, then adding the high-purity For zinc and high-purity magnesium, heat up to 750°C after the metal is melted, and then pass in argon for refining treatment; after refining, stir the alloy melt and let it stand at 730°C for 20 minutes, and ...

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Abstract

The invention provides a high-strength corrosion-resistant Al-Zn-Mg-Cu alloy added with Er and Pr and a preparation method of the high-strength corrosion-resistant Al-Zn-Mg-Cu alloy, and belongs to the technical field of metal alloys. The aluminum alloy comprises the following components in percentage by weight: 7.20 to 8.00 percent of Zn, 2.00 to 2.32 percent of Mg, 2.00 to 2.46 percent of Cu, 0.15 to 0.22 percent of Zr, 0.10 to 0.13 percent of Er, 0.15 to 0.20 percent of Pr, less than or equal to 0.1 percent of Si, less than or equal to 0.1 percent of Fe, less than or equal to 0.05 percent of other single impurities, less than or equal to 0.15 percent of total impurities and the balance of Al. Wherein 3.1 < = Zn / Mg < = 4.0, and 0.40% < = Zr + Er + Pr < = 0.55%. The invention further provides a preparation method of the high-strength corrosion-resistant Al-Zn-Mg-Cu alloy, the tensile strength of the produced high-strength corrosion-resistant Al-Zn-Mg-Cu alloy is 620-635 MPa, the yield strength is 395-415 MPa, the ductility is 9.5-11.5%, the conductivity is 34.0-35.0% IACS, and the high-strength corrosion-resistant Al-Zn-Mg-Cu alloy has excellent comprehensive performance and is suitable for being used as a high-strength corrosion-resistant structural part.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a high-strength corrosion-resistant Al-Zn-Mg-Cu alloy added with Er and Pr and a preparation method thereof. Background technique [0002] Al-Zn-Mg-Cu series aluminum alloys are a new generation of high-strength and high-hardness aluminum alloys. They are widely used in aerospace, transportation, and weapons due to their low density, high specific strength, and good ductility, toughness, and fatigue resistance. Equipment and other fields [0003] With the continuous development of my country's industry, various industries have higher standards for the comprehensive performance of aluminum alloys. Especially in the fields of aviation and navigation, Al-Zn-Mg-Cu aluminum alloys are required not only to have high strength, good fracture toughness and fatigue resistance, but also to have excellent corrosion resistance, because they are often subject to various T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053C21D8/02
CPCC22C21/10C22C1/026C22C1/03C22F1/053C22F1/002C21D8/0226C21D8/0247
Inventor 李声慈钟辉隆张志骞李德华邓红玲张思雨
Owner JIANGXI UNIV OF SCI & TECH
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