Temperature dependence of microstructure and texture in cold drawn aluminum wire
(1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;
2. School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China)
2. School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China)
Abstract: The effect of strain and drawing temperature on the evolution of microstructure and fiber textures of aluminum wires drawn at room temperature and cryogenic temperature was investigated by TEM and EBSD observations. The results show that low angle boundaries frequency increases and high angle boundaries frequency decreases with strain increasing when the strain is low. At high strain, most of grain and dislocation boundaries are parallel to the drawn direction and low angle boundaries frequency decreases and high angle boundaries frequency increases with strain increasing. The decrease of deformation temperature leads to microstructure finer and low angle boundaries frequency increasing. Texture analysis indicates that volume fraction of complex texture component decreases with strain increasing and a mixture of á111？ and á100？ fiber texture forms at high strain. á111？ is stable at low strains but á100？ becomes stable at high strain. The decrease of temperature can enhance the stability of á111？ orientation at high strain.
Key words: aluminum wire; cryogenic drawn deformation; dislocation boundary; fiber texture; misorientation angle distribution