Directional solidification structure of pure copper was observed based on ECAP through route A and Bc.The result reveals that with proceeding in deformation

continuously increased sliding band with interact cross can cut the initial sliding band to make coarse columnar grain further crush into two-dimensional cellar structure.Furthermore

the single grain copper was converted into uniformly distributed fine equiaxed grain by high density dislocation after multi-shearing and cross-sliding effects in passes of ECAP.In addition

the refining effect by route A is obviously superior to that of one by route BC.Tensile strengths of the pure copper with directional solidification structure are 420 MPa and 412 MPa

respectively

and elongations are 23.0% and 26.5%

respectively

with seven passes for route A and route BC.