Microstructure and Texture Evolution in Cold-Rolled and Annealed Oxygen-Free Copper Sheets.

Area of Science:

• Materials Science
• Metallurgy
• Physical Metallurgy

Background:

• Understanding texture evolution in metals is crucial for predicting mechanical properties.
• Oxygen-free copper is widely used in electrical and electronic applications, requiring controlled microstructural properties.

Purpose of the Study:

• To investigate the effects of varying cold-rolling reduction and annealing temperatures on the microstructure and texture of oxygen-free copper sheets.
• To correlate deformation and recrystallization textures with processing parameters.

Main Methods:

• Commercial oxygen-free copper sheets were subjected to cold-rolling (20-87% reduction) and annealing (400-600 °C).
• Microstructure and texture evolution were analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and electron back-scattered diffraction (EBSD).

Main Results:

• Deformation textures ({123}<634> S, {112}<111> Copper, {110}<112> Brass) intensified with increasing cold-rolling reduction.
• Recrystallization texture was highly dependent on prior cold-rolling reduction; a strong Cube texture formed at 87% reduction after annealing.
• Annealing temperature influenced texture component intensity and annealing twin boundary density, which decreased with rising temperature.

Conclusions:

• Strong Brass and S deformation textures facilitate the formation of a strong Cube annealing texture in oxygen-free copper.
• Increased cold-rolling reduction leads to a higher density of annealing twin boundaries.
• Processing parameters significantly control the final microstructure and texture, impacting material properties.