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Stabilizing process for Er-containing Al-Mg cold rolled sheet with high Mg content

An aluminum alloy and stabilization technology, applied in the field of stabilization technology, can solve the problems of poor resistance to intergranular corrosion, achieve the effects of refining grains, maintaining stable mechanical properties, and improving intergranular corrosion resistance

Active Publication Date: 2013-07-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor resistance to intergranular corrosion of Er-containing medium-high Mg aluminum alloy cold-rolled plates, and through stabilization treatment, the alloy also has good resistance to intergranular corrosion while maintaining a high strength

Method used

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  • Stabilizing process for Er-containing Al-Mg cold rolled sheet with high Mg content
  • Stabilizing process for Er-containing Al-Mg cold rolled sheet with high Mg content
  • Stabilizing process for Er-containing Al-Mg cold rolled sheet with high Mg content

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Experimental program
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Effect test

Embodiment 1

[0043] Step 1), step 2) are the same as those in comparative example 2, step 3), the difference is that the alloy cold-rolled sheet is annealed at 220°C for different times. The change curve of weight loss per unit area with annealing time is as follows: Figure 8 shown.

Embodiment 2

[0045] Step 1), step 2) are the same as those in comparative example 2, step 3), the difference is that the alloy cold-rolled sheet is annealed at 230°C for different times. The change curve of weight loss per unit area with annealing time is as follows: Figure 9 shown.

[0046] Depend on Figure 2 to Figure 9 It can be seen that after the alloy is annealed at 100°C to 200°C, as the annealing time prolongs, the weight loss of the alloy gradually increases, and its intergranular corrosion resistance decreases. The elongation continued to increase, but it was found by metallographic observation that intergranular corrosion also occurred. Compared with other temperatures, the weight loss curve of the alloy at 220°C to 230°C presents a completely different trend, and the weight loss of the alloy does not change with the prolongation of the annealing time, and has remained at about 2mg / cm 2 , has been in the intergranular corrosion resistance zone, showing excellent intergranul...

Embodiment 3

[0049] Step 1), step 2) are the same as Comparative Example 1.

[0050] 3) Anneal the cold-rolled sheet of Er-containing medium-high Mg aluminum alloy at 220°C for different times, and measure the microhardness of the cold-rolled sheet at 220°C with the annealing time, as shown in Figure 11 shown. Depend on Figure 11 It can be seen that the hardness of the alloy decreases greatly after annealing at 220 °C for 1 hour, from 141HV to 119.8HV, and decreases slowly with the further extension of annealing time, and finally tends to be stable. In order to ensure that the mechanical properties of cold deformed alloys after stabilization annealing at 220 °C remain at a high level, the stabilization annealing time needs to be determined. It can be seen from Comparative Example 1 that the hardness value corresponding to the starting recrystallization temperature of the alloy cold-rolled sheet is 113.2HV, and the hardness value of the alloy in the 220°C / 12-hour annealed state correspo...

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Abstract

A stabilizing process for an Er-containing Al-Mg cold rolled sheet with high Mg content belongs to the technical field of nonferrous metals. The stabilizing process comprises the following steps: multi-pass cold finish rolling after the Er-containing Al-Mg cold rolled sheet with high Mg content is subjected to intermediate annealing, wherein the final cold deformation is 75-90%; stabilizing annealing the Er-containing Al-Mg cold rolled sheet with high Mg content, wherein the annealing temperature is 220-240 DEG C, the annealing time is 3 to 5 hours; and air-cooling to room temperature. The stabilizing process reduces the alloy dislocation density, keeps the alloy mechanical property stable, and avoids continuous precipitation of a beta phase in a grain boundary, thereby improving the intergranular corrosion performance of the alloy remarkably under the condition of ensuring higher strength of the alloy.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metals, and in particular relates to a stabilization process for cold-rolled plates of Er-containing medium-high Mg aluminum alloys. The process aims to significantly improve the intergranular corrosion resistance of the alloy when the alloy has relatively high strength. Background technique [0002] Al-Mg alloy is a non-heat treatment strengthened aluminum alloy with excellent corrosion resistance, good weldability and high specific strength, which is widely used in the fields of automobiles and ships. The strengthening method is mainly through solid solution strengthening and deformation strengthening of Mg. The strength of the alloy increases with the increase of Mg content, but when the mass percentage of Mg is greater than 3.5%, even if the alloy is placed at room temperature for a long time, the strength will decrease due to the reduction of supersaturated Mg in the matrix , and the sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22F1/047
Inventor 高坤元黄铖聂祚仁文胜平黄晖
Owner BEIJING UNIV OF TECH
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