Annealing process for Al-Mg-Er alloy with medium and high Mg content

An annealing process and alloy technology, applied in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems affecting the internal dislocation density and recrystallization degree of the alloy, poor corrosion resistance, etc., so as to improve the recrystallization temperature and improve the corrosion resistance. properties and toughness, improved mechanical properties and thermal stability

Inactive Publication Date: 2021-07-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional hot-rolled sheet has high strength, its long-term corrosion resistance is poor. The annealing process affects the internal dislocation density and recrystallization degree of the alloy, thereby improving the performance of the alloy.

Method used

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  • Annealing process for Al-Mg-Er alloy with medium and high Mg content
  • Annealing process for Al-Mg-Er alloy with medium and high Mg content
  • Annealing process for Al-Mg-Er alloy with medium and high Mg content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 (i.e. comparative example):

[0012] The erbium-containing aluminum alloy (alloy composition mass percentage: Mg, 4.66%, Mn, 0.82%, Er 0.21%, Zr0.13%, the balance is Al) ingot was kept at 280 ° C for 15 h, and then heated to 470 ° C for 30 h Double-stage homogenization heat treatment was performed, and the ingot was hot-rolled to obtain an 8mm hot-rolled sheet with a total deformation of 97%. The obtained hot-rolled sheet was tested for mechanical properties at room temperature and low temperature. The test results are shown in Table 1.

[0013] Table 1 Tensile properties of hot-rolled alloys at different temperatures

[0014]

Embodiment 2

[0016] The hot-rolled sheet obtained in Example 1 was subjected to an annealing process at 350° C. for different times, and its mechanical properties were tested at room temperature and low temperature, respectively. The test results are shown in Table 2.

[0017] Table 2 Tensile properties of hot-rolled alloys at different temperatures after annealing

[0018]

[0019] It can be seen from Table 2 that no matter in the room temperature or low temperature test environment, after the annealing process at 350 °C, with the prolongation of the annealing time, the tensile strength and yield strength of the alloy show a downward trend, and the elongation increases significantly. And the change trend at room temperature and low temperature is the same, the annealed alloy with higher strength at room temperature is still higher than other states at low temperature. The low temperature elongation of the hot rolled sheet after annealing at 350℃ for 8h is the highest, reaching 35%.

...

Embodiment 3

[0024] The two state alloys in Example 1 and Example 2 were selected in the same area to observe the EBSD structure, and the grains were measured along the thickness of the plate. The average grain widths of the alloys in the two states were 2.56um and 2.55um, respectively. After annealing, the grains did not Significant growth occurred. The difference in orientation and the degree of recrystallization of the alloys in the two states were counted, and the results are shown in Tables 4 and 5.

[0025] Table 4 The ratio of grain boundary orientation difference between hot-rolled state and annealed state

[0026]

[0027] Table 5 Recrystallization degree of hot rolled and annealed state

[0028]

[0029] It can be seen from Table 4 and Table 5 that after annealing, the proportion of high-angle grain boundaries increases, the deformed structure decreases, and the proportion of subgrain and recrystallization increases. That is, subgrain, which corresponds to the decrease in...

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Abstract

The invention discloses an annealing process for an Al-Mg-Er alloy with medium and high Mg content, and belongs to the technical field of non-ferrous metals. The overall machining process of a tested alloy comprises the steps that a 5E83 alloy ingot is subjected to a 280 DEG C/15h + 470 DEG C/30h two-stage homogenization process, an aluminum alloy is subjected to head cutting and surface milling, surface impurities are removed, the aluminum alloy is subjected to temperature-controlled hot rolling, a 8-mm hot-rolled plate is obtained, the total deformation is 97 percent, and the obtained hot-rolled plate is annealed for different hours at the temperature of 350 DEG C. The alloy obtained by the process provided by the invention has better long-term corrosion resistance and higher elongation, and has more stable mechanical properties in room-temperature and low-temperature environments.

Description

technical field [0001] The invention relates to an annealing process for an Al-Mg-Er alloy hot-rolled sheet with a medium and high Mg content, and belongs to the technical field of non-ferrous metal alloys. Background technique [0002] Aluminum alloys are divided into deformed aluminum alloys and cast aluminum alloys according to processing methods, and aluminum-magnesium alloys belong to deformed aluminum alloys. Aluminum-magnesium alloys (5xxx series) have the advantages of excellent workability, low density, high specific strength, corrosion resistance and thermal conductivity, which make them widely used in machinery, construction and other fields, especially in marine engineering and transportation industries. status. The aluminum-magnesium alloy itself is a medium-strength alloy. Since the main alloying element (Mg element) cannot be dispersed and strengthened, the aluminum-magnesium alloy cannot be strengthened by heat treatment. The strength is mainly improved by s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/047C21D1/26C21D9/00C22C21/06
CPCC22F1/047C22C21/06C21D1/26C21D9/0081
Inventor 黄晖刘淑欣魏午荣莉高坤元文胜平吴晓蓝聂祚仁
Owner BEIJING UNIV OF TECH
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