Aluminum alloy and alloy sheet thereof as well as preparation method of alloy sheet

A technology of aluminum alloy sheet and alloy sheet, which is applied in the field of high-strength corrosion-resistant Al-Mg alloy and sheet products to achieve the effect of excellent mechanical properties

Active Publication Date: 2014-06-18
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid solution strengthening element Mg will continue to exist in the form of Al3Mg2 at the grain boundary during the heat treatment process, which greatly reduces the corrosion resistance of the alloy and reduces the corrosion resistance of the hull material. life

Method used

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  • Aluminum alloy and alloy sheet thereof as well as preparation method of alloy sheet
  • Aluminum alloy and alloy sheet thereof as well as preparation method of alloy sheet
  • Aluminum alloy and alloy sheet thereof as well as preparation method of alloy sheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The above four alloys were heated from room temperature to 440°C at a heating rate of 30°C / hour, kept for 5 hours, continued to be heated to 510°C, kept for 10 hours, and then cooled to room temperature with the furnace. The alloy is heated to 500°C for 2 hours and then rolled. The total deformation of hot rolling is 90%. The hot-rolled alloy is held at 375°C for 75 minutes for recrystallization annealing, followed by cold deformation with a deformation of 15%, and then 2% pre-stretching to obtain the alloy in the H321 state (cold work hardening state), measured The mechanical properties of the alloy are shown in Table 2.

[0027] Table 2 Mechanical properties of the measured alloys in the rolling direction (L-direction)

[0028]

[0029] Compared with existing reference alloys, the alloy prepared according to the invention has more excellent strength in the work-hardened state.

Embodiment 2

[0031] The above four alloys were heated from room temperature to 500°C for 13 hours, and then cooled to room temperature with the furnace. The alloy is heated to 480°C for 2 hours to carry out hot rolling with a total deformation of 95%. The hot-rolled alloy was held at 350°C for 90 minutes for recrystallization annealing, and then cold-rolled with a deformation of 10%. Stabilization annealing and 2% pre-stretching were carried out at 250°C for 1 hour to obtain a H131 state alloy sheet (stabilized state). The prepared plates were kept at 100°C for 7 days for sensitization experiments. The mass loss of the alloy after stabilization and sensitization was measured according to the ASTM G67 standard, and the exfoliation corrosion resistance of the alloy was measured according to the ASTM G66 standard. The measured mechanical properties and corrosion resistance of the alloy are shown in Table 3 and Table 4.

[0032] Table 3 Mechanical properties of alloy rolling direction (L-d...

Embodiment 3

[0039] After melting and casting No. 3 alloy, the alloy was heated from room temperature to 440°C at a heating rate of 30°C / hour, kept for 6 hours, continued to be heated to 510°C, kept for 13 hours, and then cooled to room temperature with the furnace. The starting temperature of the alloy is 520°C, and the total deformation is 92%. The hot-rolled alloy was recrystallized and annealed at 400°C for 60 minutes, and cold-rolled at room temperature with a deformation of 5%. Stabilization annealing and 2% pre-stretching are carried out at 180-275°C for 1 hour. The H131 state (stabilization treatment state) alloy plate was kept at 100°C for 7 days for sensitization experiment. The intergranular corrosion performance of the alloy after stabilization and sensitization at different temperatures was determined according to the ASTM G67 standard, and the exfoliation corrosion resistance of the alloy was measured according to the ASTM G66 standard. The corrosion properties of the measu...

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Abstract

The invention relates to an aluminum alloy and an alloy sheet thereof as well as a preparation method of the alloy sheet, belonging to the field of non-ferrous metal and preparation thereof. The aluminum alloy comprises the compositions in percentage by mass: 5.5-6.0% of Mg, 0.6-1.2% of Zn, 0.1-0.2% of Cu, 0.6-1.0% of Mn, 0-0.1% of Cr, 0-0.15% of Ti, 0.05-0.25% of Zr, 0-0.25% of Fe, 0-0.2% of Si, and the balance of Al. The stable-state or work hardening-state aluminum alloy sheet can be obtained by performing preheating or homogenization treatment to an alloy ingot prepared by the compositions, then carrying out corresponding hot rolling, cold rolling, annealing, prestretching and the like. Through the sheet, the continuous precipitation capability of Al3Mg2 in crystal boundary can be greatly reduced while the solid solution strengthening action of the Mg element can be ensured, and the sheet has excellent mechanical performance and anti-corrosion property compared with the traditional AA5059-H321 and AA5059-H131.

Description

technical field [0001] The invention belongs to the field of nonferrous metals and their preparation, and in particular relates to a high-strength anti-corrosion Al-Mg type alloy and plate products made from the alloy. Background of the invention [0002] In the following, unless otherwise stated, the nomenclature of alloys uses the nomenclature of the Aluminum Association (The Aluminum Association), and the nomenclature of heat treatment specifications (temper designations) is defined in accordance with the European standard NEN-EN515. Any descriptions of alloys and preferred elements in alloys are based on mass percentages, unless otherwise specified. [0003] In order to reduce the fuel used for power and improve the efficiency of large transport ships, it is an inevitable trend to reduce the weight of large transport ships. The development of high-strength and anti-corrosion 5××× series alloys will provide the best choice for this purpose. At present, alloys such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C21/08C22F1/047
Inventor 张迪张济山孟春艳王正安庄林忠
Owner UNIV OF SCI & TECH BEIJING
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