scholarly journals Mechanical Properties of Spark Plasma Sintering-Processed Pure Ti and Ti-6Al-4V Alloys: A Comparative Study between Harmonic and Non-Harmonic Microstructures

Compounds ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 41-57
Author(s):  
Tarik Sadat ◽  
Kyohei Hayashi ◽  
Gregory Haugou ◽  
Herve Morvan ◽  
Eric Markiewicz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Backscatter Diffraction ◽  
Pure Titanium ◽  
Rate Sensitivity ◽  
Compressive Property ◽  
Strain Rates ◽  
Plasma Sintering ◽  
Coarse Grains ◽  
Spark Plasma ◽  
Backscatter Diffraction

Microstructure characteristics and compressive property relationships of so-called harmonic (composed by fine and coarse grains) and conventional pure titanium (Ti) and Ti-6Al-4V alloy processed by powder metallurgy route are presented in the present work. Electron backscatter diffraction (EBSD) analysis was performed to characterize the as-processed microstructures. The harmonicity structure of selected samples is described, and relevant EBSD maps are presented. The bulk samples’ hardness is reported, along with compressive responses at quasi-static and intermediate strain rates, ranging from 0.005 s−1 to 16 s−1. The strain rate sensitivity of these metallic samples is discussed, and the benefits in terms of mechanical properties of the harmonic microstructures compared with the non-harmonic conventional ones are highlighted. Finally, a modified Johnson–Cook model was shown to predict fairly the experimental results.

scholarly journals Influence of Sintering Process Conditions on Microstructural and Mechanical Properties of Boron Carbide Ceramics Synthesized by Spark Plasma Sintering

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1100
Author(s):  
Yingying Liu ◽  
Sheng Ge ◽  
Yihua Huang ◽  
Zhengren Huang ◽  
Deku Zhang
Keyword(s):  
Mechanical Properties ◽  
Boron Carbide ◽  
Spark Plasma Sintering ◽  
Mechanical Performance ◽  
Electron Backscatter Diffraction ◽  
Holding Time ◽  
Process Conditions ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma

Boron carbide (B4C) ceramics were synthesized by spark plasma sintering at a temperature between 1600 and 2050 °C without employing any sintering additives. The effect of sintering process parameters, such as temperature, holding time, pressure, hearting rate, and pulsed electric current, and the particle size of the raw powder on the densification behavior and mechanical properties of B4C ceramics, were comprehensively and systematically investigated. Hardness and fracture toughness of B4C that has a density close to the theoretical value were found to be 33.5 ± 0.2 GPa and 3.21 ± 0.13 MPa·m1/2, respectively. Electron backscatter diffraction (EBSD) analysis revealed no abnormal growth of grains due to an increase in holding time and pressure. Twin structures present in ceramics are beneficial for their mechanical performance.

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.

scholarly journals Microstructural evolution and mechanical properties of pure titanium powders processed by spark plasma sintering

2019 ◽  
Vol 345 ◽  
pp. 415-424 ◽  
Author(s):  
Glenda T. Motsi ◽  
Sophie Guillemet-Fritsch ◽  
Geoffroy Chevallier ◽  
Mxolisi B. Shongwe ◽  
Peter A. Olubambi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Microstructural Evolution ◽  
Pure Titanium ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Titanium Powders

Fabrication and Mechanical Properties of ultra fine WC-6wt.%Co by Spark Plasma Sintering Process

2011 ◽  
Vol 49 (01) ◽  
pp. 40-45 ◽  
Author(s):  
Hyun-Kuk Park ◽  
Seung-Min Lee ◽  
Hee-Jun Youn ◽  
Ki-Sang Bang ◽  
Ik-Hyun Oh
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Sintering Process ◽  
Plasma Sintering ◽  
Spark Plasma

Investigation of the Deformation Twins on the Bending Cross Section of TA2 Titanium Sheet

2020 ◽  
Vol 837 ◽  
pp. 41-45
Author(s):  
Shuai Sun ◽  
Kai Hua Liu
Keyword(s):  
Electron Backscatter Diffraction ◽  
Testing Machine ◽  
Pure Titanium ◽  
Titanium Sheet ◽  
Bending Tests ◽  
Three Point Bending ◽  
Deformation Twins ◽  
Ebsd Technique ◽  
Backscatter Diffraction ◽  
Deformation Area

In order to determine the evolution features of deformation twins for TA2 commercial pure titanium (cp-TA2), the TA2 samples were bent under different bending angles in three-point bending tests via a universal testing machine. The electron backscatter diffraction (EBSD) technique was applied to identify the grain boundaries (GBs) and twin boundaries (TBs) in the bending areas. The results reveal that the type of deformation area would effect the evolution of different deformation twins. It is inferred that the state of stress would promote the multiplication of the same type of deformation twins.

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