Abstract The interfacial temperature, microstructure and hardness distribution of the linear friction welded Ti-6Al-4V joints obtained at different applied pressures were investigated. The sound Ti-6Al-4V alloy joints were successfully fabricated below the β-phase transformation temperature. The increased pressure considerably decreased the welding temperature. The dynamically recrystallized ultra-fined α equiaxed grains of 0.2 μm were formed in the weld center of the joint by applying pressure of 550 MPa. Moreover, the hardness of the weld center was higher than that of the base material without the softened region in thermo-mechanical affected zone, which suggests the improved mechanical properties of the joints.

中文翻译：

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β相变温度以下制备的Ti-6Al-4V合金线摩擦焊

摘要 研究了不同外加压力下获得的线性摩擦焊接Ti-6Al-4V接头的界面温度、组织和硬度分布。在 β 相变温度以下成功地制造了良好的 Ti-6Al-4V 合金接头。增加的压力大大降低了焊接温度。通过施加550 MPa的压力，在接头的焊缝中心形成了0.2 μm的动态再结晶超细α等轴晶粒。此外，焊缝中心的硬度高于热机械影响区没有软化区的母材，这表明接头的力学性能有所提高。