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Recrystallization texture in cold rolled copper
Dissertation   Open access

Recrystallization texture in cold rolled copper

Carl Theodore Necker Jr.
Doctor of Philosophy (Ph.D.), Drexel University
1997
DOI:
https://doi.org/10.17918/00008690
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Abstract

Materials
The development of recrystallization textures in cold rolled copper has been characterized by x-ray diffraction, electron backscatter patterning (EBSP), calorimetry and microscopy. Two oxygen free electronic (OFE) copper plates, with initial grain sizes of 45 [mu]m (FG) and 105 [mu]m (CG), were unidirectionally cold rolled to six reductions yielding von Mises strains between 1.0 and 4.5. Samples were annealed to produce a range of partially recrystallized microstructures. The results of the x-ray diffraction analysis show that the recrystallization texture of the FG material ranges from random at the lower strains to a very strong cube texture, {001}<100>, better than 100X random, at high strains. The CG copper develops a similar set of recrystallization textures, only the textures are weaker than those of the equivalently strained FG copper. The EBSP results show that the average recrystallized cube grain size is always greater than the average non-cube grain size for any prior strain in both materials. This difference, at low strains, is due to the larger volume of twins affiliated with cube orientations as compared to non-cube orientations. At high strains, the difference is due to a combination of the volume of twins as well as the increase in the average size of the cube zones (grains are divided into zones defined by parent and twin orientations). The average size of cube grains increased while that of the non-cube grains decreased. The population of cube grains increased with increasing prior strain in both materials. It is suggested that the increasing population of cube zones is a result of the preferential nucleation of cube orientations that have undergone recovery, creating large stored energy differences between the cube orientations and neighboring deformation texture components. It is hypothesized that the increasing size advantage cube zones possess, especially at higher strains, is due to the ability of cube zones to grow without accumulating solute as rapidly as growing non-cube zones.

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