LAUSR

Abstract In this work, rotary die equal channel angular pressing (RD-ECAP) was up-scaled to produce large CP-Ti billets with a cross section of 50 × 50 mm2 for 4 and 8 passes. Hardness distributions were measured on the longitudinal and cross sections of the billets after 4 and 8 passes. The tensile behaviors along three orthogonal directions were evaluated for the multi-pass samples. The microstructure and crystallographic texture of the RD-ECAP processed CP-Ti were examined and linked to its tensile anisotropy. The results showed that better hardness homogeneity was achieved after 8 passes than after 4 passes. The strength of as-received CP-Ti was improved after RD-ECAP for 4 and 8 passes, which was attributed to a refined microstructure and texture strengthening. However, the 4-pass sample exhibited obvious tensile anisotropy, resulting from crystallographic texture and deformation microstructure. After 8 passes, the tensile anisotropy was reduced, owing to the more uniform microstructure and weakening of the { 1 ¯ 2 1 ¯ 4}〈10 1 ¯ 0〉 and {01 1 ¯ 2}〈2 1 ¯ 1 ¯ 0〉 textures.