Simultaneously improving mechanical properties and corrosion resistance of pure Ti by continuous ECAP plus short-duration annealing

Journal Article · Sun Apr 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.01.050· OSTI ID:22804939

Gu, Yanxia ^[1]; Ma, Aibin; Jiang, Jinghua ^[1]; Li, Huiyun; Song, Dan; Wu, Haoran; Yuan, Yuchun ^[1]

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1. College of Mechanics and Materials, Hohai University, Nanjing 211100 (China)

Highlights: • Additional short-time annealing led to enhanced strength of UFG Ti due to texture strengthening. • UFG Ti showed improved corrosion resistance in artificial seawater compared with initial CG Ti. • Short-duration annealing enhanced corrosion resistance of UFG Ti due to stronger basal texture. - Abstract: This work investigated the effect of short-duration annealing on mechanical properties and corrosion behavior of bulk ultrafine-grained (UFG) pure Ti (grade 2) produced by high-efficiency equal-channel angular pressing (ECAP), serving the fast developing of marine industries. The initial coarse-grained (CG) Ti achieved higher strength after continuous ECAP at 420 °C for 4 passes, while additional short-duration annealing at 300 °C for 15 min of UFG Ti further led to extraordinary improvement of strength, which was associated with texture strengthening. The yield strength was increased from 362 MPa in as-received state to 561 MPa in post-ECAP annealed condition, and ultimate tensile strength from 450 MPa to 663 MPa. The ECAP-processed UFG Ti had better corrosion resistance in artificial seawater than the initial CG Ti. Short-duration annealing further improved the corrosion resistance of UFG Ti, which was related to stronger basal texture. The corrosion current density decreased from 68.37 nA cm{sup −2} for CG Ti in as-received condition to 41.77 nA cm{sup −2} for UFG Ti processed by ECAP plus short-duration annealing. The fraction of TiO{sub 2} within the surface oxide film for the post-ECAP annealed sample was increased. The bulk UFG Ti after post-ECAP short-duration annealing revealed an excellent combination of high strength, good ductility and superior corrosion resistance for marine applications.

• OSTI ID: 22804939
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 138; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
CORROSION RESISTANCE
CURRENT DENSITY
DUCTILITY
EFFICIENCY
FILMS
PRESSURE RANGE MEGA PA 100-1000
TITANIUM
YIELD STRENGTH