Effects Of Magnetic Field Strength And Direction On Texture Evolution In Cold-rolled Pure Copper Sheet By Magnetic Field Annealing

In the magnetic field annealing study,the diamagnetic pure copper sheet was selected as the original materials.Magnetic field with different strength and direction was applied during the different kinds of heat treatments.And then microhardness of the magnetically treated samples was examined by the conventional methods;Texture and microtexture were investigated by XRD and EBSD analysis,respectively.Based on the experimental results effects of magnetic field strength and direction on texture evolution in cold-rolled pure copper by magnetic field annealing were illustrated.The samples were annealed at 140? temperature for 30 min with different magnetic field strength(3T,6T,9T,12T).During the magnetic field annealing,the magnetic field was applied along the samples' rolling direction and transverse direction,respectively.The results showed that magnetic field annealing with different strength effected recrystallization texture of cold-rolled pure copper at 140? temperature.The effect currents were similar when magnetic field direction parallel or perpendicular to the rolling direction,while effect degrees were slightly different.There were mainly deformed microstructure and a small amount of recrystallization grain in treated samples when magnetic field direction parallel to the samples' rolling direction at 140? temperature.Cubic crystal nucleation and ?3 CSL was restrained by high magnetic field with the stronger magnetic field strength,the greater the inhibition;The results of study when magnetic field direction perpendicular to the samples' rolling direction were similar to which when magnetic field direction parallel to the samples' rolling direction at 140?temperature.Cubic crystal nucleation was restrained by high magnetic field with the stronger magnetic field strength,the greater the inhibition;Not only magnetic field strength but also magnetic field direction can affect recrystallization in cold-rolled pure copper.The inhibition effect when magnetic field direction perpendicular to the samples'rolling direction was stronger than that when magnetic field direction parallel to the samples' rolling direction.The samples were annealed at different temperature(120?,130?,140?,150?,160?,200?,250?)for 5 min with different angle of magnetic field direction and rolling direction(0°,15°,30°,45°,60°,75°,90°).The strength of magnetic field was 12T.The results showed that the microhardness of samples with different magnetic field direction at 120?,130? temperature was lower than which with cold-rolled.The microhardness of samples with magnetic field direction and the magnetic field direction for 60° was lowest.Texture volume percentage of S and brass changed obviously with the different magnetic field direction,and texture volume percentage of S and brass were most in samples with magnetic field direction and the magnetic field direction for 60°;Texture volume percentage of S?brass and cube changed obviously with the different magnetic field direction at 140?,150? temperature.Texture volume percentage of S and brass were most but texture volume percentage of cube was least in samples with magnetic field direction and the magnetic field direction for 60°;The results of EBSD showed that the structures of recrystallization and deformation coexist in samples with different magnetic field direction at 140° temperature.Cubic texture area percentage in recrystallization structures decreased with the increase of the angle of magnetic field direction and rolling direction.S texture area percentage and ?3 CSL both were most in sample with magnetic field direction and the magnetic field direction for 60°;Texture volume percentage of cold-rolled texture tended to be stable with the different magnetic field direction at 200?,250? temperature.The results of EBSD showed that deformed structure disappeared.Cubic texture area percentage was most while S texture area percentage was least in recrystallization structures with magnetic field direction and the magnetic field direction for 60°.