Annealing Characteristics of Nano-Grained Oxygen Free Copper Processed by Accumulative Roll-Bonding Process

2006 ◽  
Vol 6 (11) ◽  
pp. 3661-3664 ◽  
Author(s):  
Seong-Hee Lee ◽  
Chung Hyo Lee ◽  
Seung Zeon Han ◽  
Cha Yong Lim
Keyword(s):  
Tensile Strength ◽  
Accumulative Roll Bonding ◽  
Static Recrystallization ◽  
Pure Aluminum ◽  
Bonding Process ◽  
Accumulative Roll Bonding Process ◽  
Roll Bonding ◽  
Ultrafine Grains ◽  
Commercially Pure ◽  
Coarse Grains

Annealing characteristics of nano-grained oxygen free copper processed by accumulative roll-bonding (ARB) were studied. A nano-grained oxygen free copper fabricated by 8 cycles of the ARB was annealed at various temperatures ranging from 100 to 300 °C for 0.6 ks. TEM observation revealed that the ultrafine grains still sustained up to 150 °C, however above 200 °C they were replaced by equiaxed and coarse grains due to an occurrence of the static recrystallization. The tensile strength of the copper decreased largely above 200 °C. These annealing characteristics of the copper were compared with those of a commercially pure aluminum.

Fabrication of Ultrafine Grained Copper Alloy by 3-Layers Accumulative Roll-Bonding Process

2010 ◽  
Vol 443 ◽  
pp. 158-163
Author(s):  
Cha Yong Lim ◽  
Hyoung Wook Kim ◽  
Seong Hee Lee
Keyword(s):  
Grain Size ◽  
Accumulative Roll Bonding ◽  
Copper Alloy ◽  
Electron Back Scatter Diffraction ◽  
Bonding Process ◽  
Accumulative Roll Bonding Process ◽  
Roll Bonding ◽  
Ultrafine Grains ◽  
Transmission Electron ◽  
Average Grain Size

The 3-layers accumulative roll bonding process (ARB) has been attempted to increase the strength of copper alloy (Cu-0.02wt.%P) by refining grain size. The 3-layers accumulative roll bonding was conducted up to 7 cycles at room temperature without lubrication. Microstructural evolution of the copper alloy with the number of the 3-layers ARB cycles was investigated by optical microscopy (OM), transmission electron microscopy (TEM), and electron back scatter diffraction (EBSD). The average grain size has been refined from 20 μm before ARB to 170 nm after 7 cycles of 3-layers ARB. More than 70% of ultrafine grains formed by 3-layers ARB were composed of high angle grain boundaries. The average misorientation angle of ultrafine grains was 30.7 degrees in the center of the specimen. Tensile strength after 7 cycles of 3-layers ARB was 605 MPa, which is about 3.2 times higher than the initial value.

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