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Today, we will learn some knowledge about effect of cold deformation on properties of aluminum materials.
1) Density. After cold deformation, the density of aluminum material decreases due to defects such as microcracks or macrocracks and cracks in the grains.
2) Resistance. The destruction of the intergranular material causes direct contact of the crystal grains, ordering of crystal grains, intergranular and intragranular cracking, and so on, all having a significant influence on the resistance change. The first two reduce the resistance as the degree of deformation increases, and the latter reverses.
3) Chemical stability. After cold deformation, the internal energy of the material is increased, making the chemical properties more unstable and easily corroded, and in particular, stress corrosion is easily generated.
After cold deformation of aluminum, due to intragranular and intercrystalline damage, the crystal lattice is distorted and the second type of residual stress occurs, which causes the plasticity index to drastically decline and may be close to a completely brittle state in the limit state. On the other hand, due to lattice distortions, increased dislocations, elongated grains, and substructures, their strength indexes are greatly improved, ie, work hardening occurs.
After the aluminum material undergoes large cold deformation, the material exhibits anisotropy due to the texture. For example, aluminum alloy thin plates tend to show noticeable ears during deep drawing. The processing conditions should be properly controlled to take full advantage of the favorable aspects of texture and anisotropy while avoiding or eliminating its disadvantageous aspects.
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