Phase transition, microstructure and mechanical properties of TC4 titanium alloy prepared by plasma activated sintering

Sun, Yi; Luo, Guoqiang; Wu, Chaohua; Li, Jun; Shen, Qiang; Zhang, Jian

doi:10.1016/j.jallcom.2018.01.197

Cited by 62 publications

(20 citation statements)

References 34 publications

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“…These in situ whiskers can enhance the performance of the sample in the process of compressive fracture when compared with TC4 titanium materials with similar compositions. Sun et al have prepared a TC4 titanium block with the same microstructure of axial and short, tabular grains as the matrix, and obtained a compression stress of 1020 MPa, 7.8%, lower than the composite material in this paper [ 37 ]. Figure 10 shows the fracture form of the TiB whiskers during the slip of the compression.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Behaviors of Titanium Matrix Composites Containing In Situ Whiskers Synthesized via Plasma Activated Sintering

et al. 2018

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In this paper, titanium matrix composites with in situ TiB whiskers were synthesized by the plasma activated sintering technique; crystalline boron and amorphous boron were used as reactants for in situ reactions, respectively. The influence of the sintering process and the crystallography type of boron on the microstructure and mechanical properties of composites were studied and compared. The densities were evaluated using Archimedes’ principle. The microstructure and mechanical properties were characterized by SEM, XRD, EBSD, TEM, a universal testing machine, and a Vickers hardness tester. The prepared composite material showed a high density and excellent comprehensive performance under the PAS condition of 20 MPa at 1000 °C for 3 min. Amorphous boron had a higher reaction efficiency than crystalline boron, and it completely reacted with the titanium matrix to generate TiB whiskers, while there was still a certain amount of residual crystalline boron combining well with the titanium matrix at 1100 °C. The composite samples with a relative density of 98.33%, Vickers hardness of 389.75 HV, compression yield strength of up to 1190 MPa, and an ultimate compressive strength of up to 1710 MPa were obtained. Compared with the matrix material, the compressive strength of TC4 titanium alloy containing crystalline boron and amorphous boron was increased by 7.64% and 15.50%, respectively.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Behaviors of Titanium Matrix Composites Containing In Situ Whiskers Synthesized via Plasma Activated Sintering

et al. 2018

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“…In addition, in order to study the influence of TiBw on the microstructure evolution of TA15 titanium alloy and the strengthening mechanisms of TMCs with network microstructures, the TA15 alloy sample [21] was also prepared by SPS at 1100 • C for 7 min with a pressure of 50 MPa.…”

Section: Microstructure Analysis and Mechanical Propertiesmentioning

confidence: 99%

“…To date the SPS method has been used to prepare ceramics, intermetallic compounds, nanostructured materials, metal-based composites, and other materials that are difficult to sinter by conventional methods. Recently, Sun et al [21] successfully realized the rapid preparation of TC4 titanium alloy by SPS technique. In addition, Ti-4Fe-7.3Mo composites with uniform distribution reinforcement of TiB whiskers (TiBw) were prepared by SPS and hot-pressing (HP) sintering.…”

Section: Introductionmentioning

confidence: 99%

The Microstructure Evolution and Mechanical Properties of TiBw/TA15 Composite with Network Structure Prepared by Rapid Current Assisted Sintering

Wang

et al. 2019

Metals

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TiBw/TA15 (TA15 alloy reinforced by TiB whiskers) composites with network microstructures were successfully prepared by current-assisted sintering at 1100 °C for 10 min. The influence of the sintering parameters on the microstructures of obtained composites was investigated. The sintering temperature was the main factor affecting the average aspect ratio of TiBw, and the average diameter of TiBw could be controlled for various sintering conditions. Yield strength, ultimate compressive strength, and plastic strain at ambient temperature are 1172.5 MPa, 1818.4 MPa, and 22.4% for the TiBw/TA15 composites, respectively. Moreover, yield strength of the composites at 600 °C is 616.3 MPa, which is 26.1% higher than that of the TA15 titanium alloy. The effect of the TiBw on the microstructure evolution for the alloy matrix was discussed in detail. The strengthening mechanism of the TiBw/TA15 composites with network microstructure was attributed to the microstructure modification induced by TiBw, load bearing effect, and dislocation strengthening effect of the TiBw.

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“…Therefore, it is easy to obtain microstructures that can affect the mechanical properties. However, since the alloys produced by SPS are not fully dense, studies have been conducted to control the density of sintering by controlling the temperature [12,13]. In recent years, researchers have also conducted extensive research on the use of SPS technology to treat titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of TC4 powder by spark plasma sintering after hot deformation

Yan

Zhang

et al. 2020

High Temperature Materials and Processes

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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.

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Phase transition, microstructure and mechanical properties of TC4 titanium alloy prepared by plasma activated sintering

Cited by 62 publications

References 34 publications

Microstructure and Mechanical Behaviors of Titanium Matrix Composites Containing In Situ Whiskers Synthesized via Plasma Activated Sintering

Microstructure and Mechanical Behaviors of Titanium Matrix Composites Containing In Situ Whiskers Synthesized via Plasma Activated Sintering

The Microstructure Evolution and Mechanical Properties of TiBw/TA15 Composite with Network Structure Prepared by Rapid Current Assisted Sintering

Microstructure evolution of TC4 powder by spark plasma sintering after hot deformation

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