Abstract
AbstractThe 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.
Highlights
Titanium alloys are widely used in aerospace and marine applications due to its high specific strength, high-Spark plasma sintering (SPS) has the characteristics of fast heating rate, short sintering time, controllable structure and uniform density [9,10] compared with pressureless sintering method, hot pressing method and hot isostatic pressing method
A few reports are available on the high-temperature hot deformation of TC4 titanium alloy prepared by SPS
The microstructural evolution of TC4 titanium alloy was investigated under the hot deformation condition
Summary
Titanium alloys are widely used in aerospace and marine applications due to its high specific strength, high-. Since the alloys produced by SPS are not fully dense, studies have been conducted to control the density of sintering by controlling the. A few reports are available on the high-temperature hot deformation of TC4 titanium alloy prepared by SPS. The main idea of the study was to realize the whole process by increasing the density of the powder by a forging process under conditions in which the powder was not completely densified during the SPS process. The microstructural evolution of TC4 titanium alloy was investigated under the hot deformation condition. Microstructure evolution and grain refinement behavior of TC4 titanium alloys were studied during high-temperature deformation. It provided the experimental basis for theoretical analysis and the formulation of hot deformation process parameters. The microstructure of TC4 titanium alloy was tested and analyzed by X-ray diffraction (XRD) scanning electron microscope and electron backscattered diffraction
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