Effect of Different Deformation Methods on Microstructure Evolution of TC4 Titanium Alloy Prepared by Spark Plasma Sintering

2020 ◽  
Vol 993 ◽  
pp. 254-258
Author(s):  
Yong Xue ◽  
Jiang Peng Yan ◽  
Hong Zhi Fan ◽  
Hai Jun Liu ◽  
Zhi Min Zhang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Dynamic Recrystallization ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Microstructure Evolution ◽  
Alloy Powder ◽  
Tc4 Titanium Alloy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Number Of Passes

TC4 titanium alloy powder was made into the test piece by spark plasma sintering. The hot deformation of TC4 titanium alloy was performed on the Gleeble-1500 experiment machine. The effects of microstructure were studied. The results show that the number of passes increased with the increasing of the relative density at the same amount of deformation. The relative density have an important influence in one-pass deformation. At the deformation temperature of 950°C and a strain rate of 0.1s-1, the microstructure of TC4 titanium alloy was the weave-basket structure, and the widmanstatten structure existed. The increase in the number of passes could promote the growth of dynamic recrystallization grains under the same amount of deformation.

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

2020 ◽  
Vol 39 (1) ◽  
pp. 457-465
Author(s):  
Jiangpeng Yan ◽  
Zhimin Zhang ◽  
Jian Xu ◽  
Yaojin Wu ◽  
Xi Zhao ◽  
...  
Keyword(s):  
Strain Rate ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Hot Deformation ◽  
Tc4 Titanium Alloy ◽  
Weave Structure ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Average Relative Density ◽  
Low Strain Rate

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.

scholarly journals The effect of heat treatment on α/ β phases evolution of TC4 titanium alloy fabricated by spark plasma sintering

2020 ◽  
Vol 50 ◽  
pp. 713-718
Author(s):  
Kaihua Xu ◽  
Yong Xue ◽  
Zhimin Zhang ◽  
Qiang Wang ◽  
Jiangpeng Yan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Spark Plasma Sintering ◽  
Tc4 Titanium Alloy ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Effect of multi-pass deformation on microstructure evolution of spark plasma sintered TC4 titanium alloy

2020 ◽  
Vol 39 (1) ◽  
pp. 328-339
Author(s):  
Jiangpeng Yan ◽  
Yong Xue ◽  
Zhimin Zhang ◽  
Yaojin Wu ◽  
Xi Zhao
Keyword(s):  
Titanium Alloy ◽  
Relative Density ◽  
Hot Deformation ◽  
Electron Backscatter Diffraction ◽  
Strain Curve ◽  
Tc4 Titanium Alloy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The One ◽  
Backscatter Diffraction

AbstractThe TC4 titanium alloy powder test piece was prepared by spark plasma sintering. The multi-pass hot deformation of the TC4 titanium alloy was tested by using the Gleeble-1500 experiment machine. Measurement of relative density, X-ray diffraction, optical microscopy, scanning electron microscopy and electron backscatter diffraction were carried out for the TC4 titanium alloy. In order to reveal the evolution of the microstructure, describing its changes systematically is necessary, which has become the focus of this article. The results show that after multi-pass hot deformation, the relative density of the TC4 titanium alloy could reach 99.93%. With the increase in deformation and decrease in temperature, the β-transformed phase was retained, and many fine β-transformed phases were formed between two adjacent lamellar α. During the one-pass hot deformation, the rapid increase in relative density was the main reason for the instability of the flow stress in the stress–strain curve. For two-pass and three-pass hot deformations, more features of dynamic recrystallization and the characteristics of dynamic recovery at high strain rates (5 s−1) could be found. The size of the grains was about 15 µm after the three-pass hot deformation.

Spark Plasma Sintering of Cryomilled Nanocrystalline Al Alloy - Part I: Microstructure Evolution

2011 ◽  
Vol 43 (1) ◽  
pp. 327-339 ◽  
Author(s):  
Yuhong Xiong ◽  
Dongming Liu ◽  
Ying Li ◽  
Baolong Zheng ◽  
Chris Haines ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Microstructure Evolution ◽  
Al Alloy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Alloy Part

Spark Plasma Sintering and Hot Pressing Sintering of Nanocrystalline WC-10CO-0.8VC

2007 ◽  
Vol 534-536 ◽  
pp. 1229-1232
Author(s):  
Li Hui Zhu ◽  
Guang Jie Shao ◽  
Yi Xiong Liu ◽  
Dave Siddle
Keyword(s):  
Relative Density ◽  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Nanocrystalline Powders ◽  
Microstructure And Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Hot Pressing Sintering

WC-10Co-0.8VC nanocrystalline powders were sintered by spark plasma sintering (SPS) and hot pressing sintering (HPS), and the microstructure and properties were compared. Results show that, sintered at 1300°C, the sample prepared by SPS for only 3 minutes has higher density than that prepared by HPS for 60 minutes. SEM and SPM observation shows SPS at 1200°C has a more uniform and finer microstructure, and most of the WC grains are smaller than 100nm. It has a relative density of 95.1%, HV30 of 1887, and KIC of 11.5 MPam1/2. If a suitable sintering parameter is chosen, SPS is a promising consolidation technique to prepare nanocrystalline WC-10Co-0.8VC with improved properties.

Consolidation of SiC Powder Coated with SiO2 Nanolayer by Spark Plasma Sintering

2014 ◽  
Vol 616 ◽  
pp. 32-36 ◽  
Author(s):  
Zhen Hua He ◽  
Hirokazu Katsui ◽  
Rong Tu ◽  
Takashi Goto
Keyword(s):  
Silicon Carbide ◽  
Chemical Vapor Deposition ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Plasma Sintering ◽  
Spark Plasma

Silica (SiO2) nanolayer was coated on silicon carbide (SiC) powder by rotary chemical vapor deposition (RCVD). The SiC/SiO2 composite were consolidated by spark plasma sintering (SPS) at 1923 K using the SiO2 coated SiC powder. The relative density and hardness of the SiC/SiO2 composites increased with increasing SiO2 content, and were 97% and 17 GPa, respectively, at SiO2 content of 22 mass%. The relative density and hardness of a composite consolidated using the mixture powders of SiC and SiO2 (22 mass%) at 1923 K were 81% and 8 GPa, respectively.

Sintering Performance and Mechanical Properties of Titanium Compacts Prepared by Spark Plasma Sintering

2012 ◽  
Vol 706-709 ◽  
pp. 217-221 ◽  
Author(s):  
Hiroshi Izui ◽  
Genki Kikuchi
Keyword(s):  
Mechanical Properties ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Tensile Property ◽  
Density Ratio ◽  
Alloying Elements ◽  
Blended Elemental ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Stabilizing Element

Titanium alloys were produced by blended elemental powder metallurgy (P/M) method. We focused on the effect of alloying elements (Fe, Mo, and Al) on the consolidation and mechanical properties of Ti compacts prepared by spark plasma sintering. The effects of amount of alloying elements and sintering temperature on the relative density and tensile properties of Ti compacts were investigated. The addition of β-stabilizing elements (Fe and Mo) significantly improved the densification of Ti compacts, where the relative density ratio of Ti-5 wt% Mo specimen became higher than 99.9 %, and Ti-5 wt% Fe specimen higher than 99.0 %. On the other hand, the addition of Al as α-stabilizing element led to improve the relative density of Ti-5 wt% Al compact with higher than 99.9 %. The tensile property for sintered Ti-5 wt% Mo compact had the highest elongation of 16 %. It will be discussed the microstructures and tensile property of the compacts.

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