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Ti-0.21 mass%O and Ti-0.71 mass%O with {0001}<10-10> texture were prepared, and their tensile and fatigue properties were investigated. In tensile tests, Ti-0.71 mass%O exhibited higher elongation than that of Ti-0.21 mass%O. Furthermore, the work-hardening rate of Ti-0.71 mass%O remained high until the end of deformation. The pyramidal slip in Ti-0.71 mass%O alloy was activated, and the number of active slip systems increased. The enhanced work-hardening behavior is likely associated with increased dislocation interactions promoted by the texture-controlled slip activity. Cyclic and dwell fatigue tests were conducted on both Ti-O alloys. Ti-0.21 mass%O alloy exhibited significant elongation and ductile fracture under both cyclic and dwell fatigue at a cyclic stress of 90% of the 0.2% proof stress. In contrast, Ti-0.71 mass%O alloy showed lower elongation and the formation of localized strain fields near grain boundaries. Similar fatigue deformation behavior was observed even when the cyclic stress was reduced to 60% of the 0.2% proof stress. Ti-0.71 mass%O alloy contained a high density of pinned, sessile dislocations, which limited dislocation pile-up lengths and hindered the activation of dislocation sources such as the Frank-Read source. Consequently, oxygen addition modified the fatigue deformation behavior by limiting dislocation multiplication under cyclic and dwell loading.

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Keyword: Ti-O alloy, texture, tensile strength, fatigue property, elongation, work-hardening, slip system

Conference: The 12th Pacific Rim International Conference on Advanced Materials and Processing (2026-08-09 - 2026-08-13)

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Manuscript type: Not a journal article

MDR DOI: https://doi.org/10.48505/nims.6475

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Updated at: 2026-08-24 14:42:32 +0900

Published on MDR: 2026-08-24 16:27:40 +0900