Method for weakening cardinal plane texture of magnesium alloy plate strip

A magnesium alloy plate and texture technology, applied in the field of magnesium alloy processing, can solve problems such as poor ductility, and achieve the effects of overcoming the difficulty of weakening texture, easy operation and reasonable process design

Inactive Publication Date: 2012-04-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of poor ductility of existing magnesium alloy strips due to strong base surface texture, and provide a kind of reasonable process design, simple operation, using corrugated rolls to repeatedly wave bend magnesium alloy strips and re- A method of weakening the base surface texture of magnesium alloy strips by crystallization annealing to achieve the purpose of improving the ductility of magnesium alloy strips

Method used

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  • Method for weakening cardinal plane texture of magnesium alloy plate strip
  • Method for weakening cardinal plane texture of magnesium alloy plate strip
  • Method for weakening cardinal plane texture of magnesium alloy plate strip

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Effect test

Embodiment 1

[0034] AZ31 magnesium alloy sheets were subjected to repeated wave bending at 370 °C using corrugated rolls. Place the plate between the corrugated rolls, the ratio of the distance H between the crest and the trough of the roll to the radius R of the crest or trough bending arc is: H:R=1.5, and the ratio to the thickness D of the plate is: H:D=2, adjacent The ratio of the distance L between the crests to the radius R of the crest or trough bending arc is: L: R = 5, the plate is rolled alternately for 4 passes, then the plate is straightened, water quenched, and the plate is heated to 370°C, keep warm for 20 minutes. attached by figure 1 and 2 It is known that after repeated wave bending of the plate, the grains are refined to less than 10 μm, the texture strength is significantly reduced, and the texture changes from strictly distributed in the normal direction of the plate to random distribution.

Embodiment 2

[0036] AZ31 magnesium alloy sheets were subjected to repeated wave bending at 420 °C using corrugated rolls. Place the sheet between the corrugated rolls, the ratio of the distance H between the crest and the trough of the roll to the radius R of the bending arc of the crest or trough is: H:R=1.5, and the ratio to the thickness D of the sheet is: H:D=1.2, adjacent The ratio of the distance L between the crests to the radius R of the crest or trough bending arc is: L: R = 3, the plate is rolled alternately for 6 passes, then the plate is straightened, water quenched, and the plate is heated to 420°C, keep warm for 20 minutes. attached by image 3 and 4 It is known that after repeated wave bending, the grains are refined to less than 10 μm, the grain orientation distribution is randomized, and the texture strength is significantly reduced.

Embodiment 3

[0038] The pure magnesium sheet was repeatedly wave-bent using corrugated rolls at 250 °C. Place the plate between the corrugated rolls, the ratio of the distance H between the crest and the trough of the roll to the radius R of the crest or trough bending arc is: H:R=1.5, and the ratio to the thickness D of the plate is: H:D=2, adjacent The ratio of the distance L between the crests to the radius R of the crest or trough bending arc is: L: R = 5, the plate is rolled alternately for 6 passes, then the plate is straightened, water quenched, and the plate is heated to 250°C, keep warm for 15 minutes. attached by Figure 5 It is known that after repeated wave bending, the grains of the plate are refined to less than 20 μm.

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Abstract

The invention relates to a method for weakening the cardinal plane texture of a magnesium alloy plate strip, which comprises the following steps of: placing the magnesium alloy plate strip between corrugated rollers, carrying out alternative rolling for many times under the temperature of 300-550 DEG C, straightening, and water quenching, or carrying out multi-channel one-way or alternative rolling for many times under the temperature of 150-300 DEG C, straightening, carrying out static recrystallization, and annealing; carrying out corrugated rolling at the temperature of over 300 DEG C, andincreasing along with the channel, wherein each flat surface which is vertical to normal direction of the plate strip is respectively applied with shearing force in different directions; inducing dynamic recrystallization, so that the orientation distribution of grains in the plate strip is randomized, and the strength of the cardinal plane texture is reduced; and carrying out corrugated rolling under the temperature of below 300 DEG C, wherein at the position in the plate strip, especially, the position where the repeated wave bending deformation is the most serious, a large amount of twin crystals are produced to enable the grain orientation to deflect, and further, the initial texture is weakened. The invention has the advantages that the process design is reasonable, the equipment is easy to manufacture, the operation process is easy to realize, the defects of the normal plastic deformation and difficulty in weakening of the texture in annealing of the magnesium alloy are overcome, and the efficiency is high. The method is suitable for the large scale of industrial production.

Description

technical field [0001] The invention discloses a method for weakening the texture of the base surface of a magnesium alloy strip, in particular referring to using a corrugated roller to cause repeated wave bending deformation of the magnesium alloy strip, resulting in weakening of the texture of the base surface. The invention belongs to the technical field of magnesium alloy processing. Background technique [0002] As the lightest commercial metal structural material, magnesium alloy has the characteristics of high specific strength, excellent electromagnetic shielding and dimensional stability of parts, and is widely used in the fields of automobile, aerospace, electronics and civil products. However, after the magnesium alloy ingot is billeted and rolled into a plate, a strong grain basal plane parallel to the plate surface usually forms a basal texture, which is difficult to reduce or eliminate through ordinary deformation or annealing processes. Recrystallization only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 杨续跃霍庆欢马继军
Owner CENT SOUTH UNIV
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