Abstract Superior superplasticity of 682% was newly-achieved in an as-rolled 2.5 vol. % TiB reinforced near-α Ti matrix composite with 0001 11 2 ¯ 0 > and { 11 2 ¯ 0 } 10 1 ¯ 0 > texture components, which was attributed to dynamic globularization/recrystallization. Microstructure characterization shows that the dominant mechanism of dynamic globularization was associated with the following progress. First, the low-angle grain boundaries (LAGBs) divided the elongated α grain into two equiaxed sub-grains. Then, the LAGBs gradually evolved to HAGBs impelled by grain boundary sliding. Finally, switching and rotation of these neighboring grains occurred, which accelerated the formation of equiaxed grain. In addition, it was found that TiB can not only induce dynamic globularization by hindering dislocation gliding and promoting the formation of sub-grain boundaries, but also induce discontinuous dynamic recrystallization by the particle stimulated nucleation mechanisms. The most interesting, nano-scale (Zr,Ti)5Si3 particles with special arrangement induced dynamic globularization/recrystallization were discovered.

中文翻译：

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TiB/near-α Ti基复合材料中的颗粒诱导动态球化/再结晶和独特的超塑性

摘要 2.5 卷轧制新获得了 682% 的超塑性。% TiB 增强的近α Ti 基复合材料具有 0001 11 2¯ 0 > 和 { 11 2 ¯ 0 } 10 1 ¯ 0 > 织构成分，这归因于动态球化/再结晶。微观结构表征表明，动态球化的主要机制与以下进展有关。首先，低角度晶界 (LAGB) 将拉长的 α 晶粒分成两个等轴亚晶粒。然后，在晶界滑动的推动下，LAGBs逐渐演变为HAGBs。最后，这些相邻晶粒发生切换和旋转，加速了等轴晶粒的形成。此外，结果表明，TiB 不仅可以通过阻止位错滑动和促进亚晶界的形成来诱导动态球化，而且还可以通过粒子激发的成核机制诱导不连续的动态再结晶。发现了最有趣的纳米级 (Zr,Ti)5Si3 颗粒，其具有特殊排列诱导的动态球化/再结晶。