The paper analyzes how the elastic properties of titanium and its alloys vary as their structure is transformed from coarse- to ultrafine-grained under severe plastic deformation. The analysis includes acoustic measurements of the elastic modulus of Ti materials with a piezoelectric composite oscillator over a wide amplitude range, a detailed examination of their microstructure by electron microscopy and electron backscatter diffraction, and estimations of their nanoporosity by small-angle X-ray scattering and their density by precision weighing before and after applying a high hydrostatic pressure (1.5 GPa). The results of the analysis show that such structural transformations can cause a noticeable change in the elastic properties of Ti materials due to dislocations, nanoporosity, high internal stress, and initial grain structure.

中文翻译：

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剧烈塑性变形对钛及其合金弹性性能的影响

分析了钛及其合金在剧烈塑性变形下组织由粗晶向超细晶转变时，其弹性性能如何变化。分析包括使用压电复合振荡器在宽振幅范围内对 Ti 材料的弹性模量进行声学测量，通过电子显微镜和电子背散射衍射对其微观结构进行详细检查，以及通过小角度 X 射线散射估计其纳米孔隙率以及在施加高静水压力 (1.5 GPa) 之前和之后精确称重它们的密度。分析结果表明，由于位错、纳米孔隙率、高内应力和初始晶粒结构，这种结构转变会导致 Ti 材料的弹性性能发生显着变化。