Abstract:The mechanism of strengthening of cube texture ({001}〈100〉) by additional-annealing of high purity aluminum foils was investigated by using orientation distribution functions (ODFs) and electron back scattered diffraction (EBSD). The results of ODFs and fiber show that the orientation densities of the S {123}〈634〉 and Cu {112}〈111〉 components increase in both the additional-annealed samples and the 0.11mm final cold-rolled foils. And the EBSD results demonstrate that cube nuclei can be identified in the deformed matrix of those additional-annealed samples. It is suggested that the strengthening of cube texture can be brought out by the increasing of components of S and Cu and the formation of cube nuclei caused by additional-annealing. Moreover, it is found that the cube texture increases first and then decreases with increasing additional-annealing temperature, and it is the strongest at 180℃.The strengthening of cube texture by additional-annealing is proposed as the result of oriented growth of cube subgrains.

Key words:  high purity aluminum foils; additional-annealing; cube texture; ODF; EBSD