We have developed the new ECAP (Equal-channel angular pressing) process termed RD(Rotary-Die) ECAP. In current ECAP, a billet is repeatedly passed through two channels of equal cross-section intersecting at an angle. Then, intense plastic strain is introduced in a material without changing the cross-sectional area. RD-ECAP is differentiated from current ECAP by the following characteristics.

• Billet removal and re-insertion between passes are not required.
• The ECAP time is reduced by more than 75% compared to ordinary ECAP.
• The ECAP temperature can be precisely controlled and altered for different passes.

RD-ECAP is being applied to produce nano-structure metallic materials.