Microstructure and texture evolution of particle-containing AA3104 alloy cold rolled to large strains

摘要

The evolution of the microstructure in a particle-containing AA3104 aluminium alloy cold rolled tolarge strains has been investigated using the electron channelling contrast imaging and electronbackscattered diffraction techniques. It is found that the microstructure evolves from cell-blockstructure at low strains into a lamellar structure composed of lamellar boundaries (LBs) andinterconnecting cell boundaries at high strains. The orientation dependence of deformationmicrostructure is also observed in this particle-containing alloy even at high strains. Differentparticles have different effects on the microstructure evolution. It is found that there is no cleareffect of the fine dispersoids on the evolution of lamellar structure even at large strains, whilesignificant distortion of LBs structure occurs around the coarse constituent particles. For bothtypes of boundaries, the average boundary spacing decreases and the average misorientationangle increases with increasing strain. No saturation of these structure parameters is reached.The texture evolves in a typical manner with finely distributed deformation texture componentscomposed of small volume elements of the ideal texture components (brass, S and copper)separated by LBs. It is found that the particles have no strong effect on the texture evolution.