Abstract
The continuous columnar grained (CCG) Cu–12 wt-%Al alloy shows significant advantages in elasticity, conductivity and plasticity. Especially, the ductility is enhanced from 3% to >20% compared with conventional polycrystalline counterparts. However, usual cold and hot working are not suitable for the CCG alloy wires because of poor workability and recrystallisation respectively. In the present paper, the deformation mechanism, phase transformation behaviour and microstructure evolution during the drawing process were investigated. Then, the effects of the deformation temperature on the microstructure and mechanical properties of the CCG alloy were studied to determine reasonable temperature range for warm drawing. The results show that total elongation of 1500% and total reduction of cross-section of 93·7% for the CCG alloy wire could be obtained by drawing at 340–400°C. After the warm drawing process, the CCG microstructure was also maintained and the surface of the wire remained bright without obvious oxidation.
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