After the aluminum alloy circle disc is rolled and annealed, the crystallographic orientation of the particles will change to a certain extent, and the mandrel coordinates will deviate. This deviation will stabilize with the amount of deformation or the degree of recrystallization during the rolling process. At this time, the part of the aluminum sheet that forms a different angle with the rolling direction will have different properties. This is called anisotropy. If the anisotropy is very strong, it is not conducive to the deep drawing of the aluminum wafer, so it is necessary to take measures to reduce the anisotropy of aluminum wafers.
Understanding the factors that affect the structure of the aluminum wafer, and then making adjustments to these influencing factors, is the fastest and most effective way to implement.
1, alloying elements
De um modo geral, the higher the purity of the alloy, the fewer impurity components it contains, and the resulting texture is pure metallic, which will have a stronger cubic texture after annealing. If the content of iron in aluminum flakes increases, the deformation texture will be enhanced and recrystallization will be restricted. If the recrystallization process is inhibited, the cubic structure of the aluminum sheet will be weakened during annealing, and the annealing texture will be strengthened at this time. De um modo geral, the combination of high-silicon and low-iron alloys will have a smaller ear-making rate. If the content of iron increases while the content of silicon decreases, significant deformation texture will occur at this time.
2, Rolling deformation
The texture of the aluminum alloy sheet depends on the value of the amount of cold deformation, which has a direct impact on the texture, anisotropy, and ear-making behavior of the aluminum sheet. If the reduction rate of the sheet is greater than 50%, the deformation texture of the sheet will develop significantly. If the reduction rate continues to increase, the strength of the deformation texture will increase. If the reduction of the hot rolling pass is increased during hot rolling, It will increase the rolling temperature, and the dynamic recrystallization will happen quickly. Ao mesmo tempo, the cubic orientation during annealing will also increase. At this time, the cubic texture will increase, which can effectively reduce the anisotropy of the aluminum plate.
3, Influence of heat treatment system
Adding metal will change the original properties. If the manganese-containing aluminum alloy is homogenized, the distribution of the second phase can be improved, and the cubic texture during hot rolling and annealing can be formed. The size of the recrystallized grains depends on the distribution and shape of the particles, the forming of the sheet, the metal flow during deep drawing, the rolling and annealing structure, etc.. will also be affected.
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