Investigation on the room temperature compressive creep behavior of TC4 titanium alloy joints with vacuum electron beam welding

YW Yan and P Liu and AQ Wang and JP Xie and XQ Bian and ZB Wang, SOLID STATE COMMUNICATIONS, 391, 115641 (2024).

DOI: 10.1016/j.ssc.2024.115641

The room temperature compressive creep behavior is a key issue for the titanium alloys welded structural components served in deep-sea environment. In the present work, the compressive creep behavior of different areas for TC4 titanium alloy joints with vacuum electron beam welding was systematically studied, and it is found that the fusion zone (FZ) of TC4 titanium alloy joints has the minimum creep strain rate. This is mainly because the creep deformation of TC4 titanium alloy is mainly controlled by the movement of dislocations in the alpha or alpha ' phases, the size of alpha ' phase in FZ is small, and thus the dislocation slip is limited. MD simulation results have further revealed that the room temperature compressive creep nature of alpha-Ti can be regarded as a dynamic hysteresis phenomenon in plastic strain and is dominated by the dislocation movement.

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