Abstract The cylindrical samples of TC4 titanium alloy prepared by spark plasma sintering (SPS) were compressed with hot deformation of 70% on the thermosimulation machine of Gleeble-1500. The temperature of the processes ranged from 850°C to 1,050°C, and the strain rates varied between 0.001 and 5 s−1. The relative density of the sintered and compressed samples was measured by the Archimedes principle. During hot deformation, the microstructure of the sample was observed. The results show that the average relative density of the samples was 90.2% after SPS. And the relative density was about 98% after the hot deformation of 70%. Under high temperature (>950°C), the sensitivity of flow stress to temperature was reduced. At low strain rate (0.001 s−1), the increase in the deformation temperature promoted the growth of dynamic recrystallization (DRX). At the same temperature, the increase in strain rate slowed down the growth of DRX grains. And the variation tendency was shown from the basket-weave structure to the Widmanstätten structure at a low strain rate (<0.1 s−1), with increase in the strain rate.

中文翻译：

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热变形后放电等离子烧结TC4粉末的组织演变

摘要 在Gleeble-1500热模拟机上对放电等离子烧结(SPS)制备的TC4钛合金圆柱试样进行70%的热变形压缩。该过程的温度范围为 850°C 至 1,050°C，应变速率在 0.001 至 5 s-1 之间变化。通过阿基米德原理测量烧结和压缩样品的相对密度。在热变形过程中，观察样品的微观结构。结果表明，SPS后样品的平均相对密度为90.2%。热变形70%后，相对密度约为98%。在高温（>950°C）下，流动应力对温度的敏感性降低。在低应变率 (0.001 s−1) 下，变形温度的升高促进了动态再结晶（DRX）的生长。在相同温度下，应变速率的增加减慢了 DRX 晶粒的生长。并且在低应变率（<0.1 s-1）下，随着应变率的增加，从篮式编织结构到Widmanstätten结构显示出变化趋势。