Effect of Cold Rolling Deformation on Microstructure and Mechanical Properties of Al-Cu-Mg Alloy

The effects of cold deformation on the microstructure and properties of hot rolled Al⁃Cu⁃Mg alloy were studied by optical microscopy, scanning electron microscopy, EBSD technology, transmission electron microscopy and a universal tensile testing machine. The microstructure observation results show that with increasing cold rolling deformation, the undissolved Al2CuMg [Fe,Mn] phase and Al2Cu [Fe, Mn] phase in the alloy are broken. There are many rod⁃like Al20 Cu2Mn3 phases in the matrix, and there are a large number of entanglement dislocations near the T phase, which have an obvious strengthening effect on the alloy. When the cold rolling deformation is 19%, the dislocation density reaches the maximum. At the same time, with the increase in cold rolling deformation, the texture content of S, R, Cube, Goss and Brass increases, and the texture content of 〈111〉〈110〉 decreases. The results of the mechanical property tests show that with increasing cold rolling deformation, the strength of the alloy increases, and the elongation remains at a high level. When the cold rolling deformation is 11%, the comprehensive mechanical properties of the alloy in the rolling direction are the best, with a tensile strength of 465.0 MPa, yield strength of 291.6 MPa and elongation of 19.0%. At this time, the transverse tensile strength of the alloy is 469.9 MPa, the yield strength is 318.0 MPa, and the elongation is 16.9%. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.