Equal-channel angular pressing (ECAP) process was applied to a 12 mm × 12 mm × 80 mum billet of pure copper(99.98 wt.%) at room temperature. The shear deformation charactersfics, microstructure evolution, and tensile properties were investigated. A combination of high strength (～420 MPa) and high elongation to failure (～25%) was achieved after eight ECAP passes at room temperature. The mixing of ultrafine grains (～0.2 μm) with nanocrystalline grains (～80 nm) resulted in high tensile strength and ductility.
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