Article
Chemistry, Physical
Siyao Xie, Yafei Pan, Yaozhen Fan, Teichui Yuan, Ruidi Li
Summary: The densification kinetics of FCC-matrix and BCC-matrix high entropy alloys (HEAs) were studied at sintering temperatures ranging from 950°C to 1050°C. The densification activation energy in the low-stress exponent stage was linearly fitted to be 264.91 kJ/mol for Al0.3CoCrFeNi and 220.99 kJ/mol for AlCoCrFeNi. The densification mechanism in this stage was proved to be atomic diffusion. However, in the high-stress exponent stage, the densification activation energy for Al0.3CoCrFeNi increased to 554.77 kJ/mol and the densification mechanism changed to creep. The BCC-FCC transformation in AlCoCrFeNi reduced its creep resistance due to different deformation behavior in BCC and FCC phase. The research also demonstrated that a higher heating rate induced a stronger electromigration effect, reducing the densification activation energy and accelerating densification.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Maksim S. Boldin, Alexander A. Popov, Evgeni A. Lantsev, Aleksey Nokhrin, Vladimir N. Chuvil'deev
Summary: This article presents the investigation results of the densification behavior mechanism of alumina-based ceramics during spark plasma sintering. The effects of heating rates and additives were studied. The study showed that grain boundary diffusion and particle accommodation control the formation of necks between particles in the initial stage of sintering. Additives only have an effect on the final stage of spark plasma sintering.
Article
Metallurgy & Metallurgical Engineering
Mei Zhang, Wen-jun Wang, Tie-chui Yuan, Si-yao Xie, Rui-di Li, Zhi-hui Zhou, Yun-bao Xu
Summary: Dense B4C material was fabricated using spark plasma sintering method, and the mechanisms of densification and grain growth were investigated. The results show that there are two sintering periods, densification period and grain growth period, and the mechanisms involve grain boundary sliding, dislocation climb, grain boundary diffusion and volume/liquid-phase diffusion.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Materials Science, Multidisciplinary
Rubia Hassan, Kantesh Balani
Summary: The sintering mechanisms of ZrB2 and SiC-reinforced ZrB2 ceramic composites were investigated by determining the activation energy of densification in different temperature ranges. The results showed that the addition of SiC changed the prominent densification mechanism and impacted the mechanical performance with systemic increase of sintering temperature.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Gyeonghun Kim, Jungsu Ahn, Sangjoon Ahn
Summary: The study examined the spark plasma sintering behavior of uranium mononitride synthesized by the hydride-nitride process, revealing two regimes in the sintering process based on temperature. At lower temperatures, pellet density increased with temperature to a maximum value, while grain growth was insignificant. On the other hand, at higher temperatures, rapid achievement of maximum density and significant grain growth were observed.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yun Wang, Yi Zhong, Bin Su, Tao Shi, Qingdong Xu, Yichuan Liao, Libing Yu, Mingfu Chu, Rui Gao, Zhenliang Yang, Bingqing Li, Jingkun Xu, Xiaobo Yang, Bin Bai, Pengcheng Zhang
Summary: U3Si2 is an excellent candidate for accident tolerant fuels (ATF) due to its high uranium density and good thermal conductivity at high temperature. In this study, U3Si2 pellets were fabricated by spark plasma sintering (SPS) and the densification mechanism of U3Si2 by SPS was investigated. The results showed that the densification of SPS-sintered U3Si2 occurred via plastic deformation controlled by dislocation motion.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mei Zhang, Tiechui Yuan, Shenghua Deng, Ruidi Li, Zhihui Zhou, Yunbao Xu, Yingjie Zhang
Summary: The densification mechanism of boron carbide is revealed by considering the effect of electromigration induced by electric current during spark plasma sintering (SPS). Different electric current values are obtained by choosing different heating rate, resulting in the different dislocation density as well as densification behavior. A densification model was proposed which taking into account the instantaneous electric current density, showing a transformation from atom-diffusion-controlled creep deformation mechanism for low electric current to dislocation-glide-controlled mechanism for high electric current.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lei Huang, Yafei Pan, Jiuxing Zhang, Yong Du, Yuhui Zhang
Summary: This study investigated the microstructure, densification mechanism, and mechanical properties of W-30Si targets prepared by spark plasma sintering (SPS). The results revealed that the effective stress exponent and temperature played crucial roles in the densification mechanism. Additionally, the microhardness increased with increasing temperature.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
P. Yu Nikitin, I. A. Zhukov, A. B. Vorozhtsov
Summary: In this work, AlMgB14-based materials were successfully obtained by spark plasma sintering from an (Al-Mg)-B powder mixture, and their microstructure and properties were investigated. Samples sintered at high temperatures exhibited high hardness, and a mechanism for the decomposition of AlMgB14 during local overheating was proposed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Lihong Liu, Koji Morita
Summary: By using a simple one step spark-plasma-sintering (SPS) process to form a fine-grained Al2O3 layer on MgAl2O4, transparent MgAl2O4/Al2O3 laminated composites with an in-line transmission higher than 40% and a hardness of 29.1 GPa can be obtained. This composite structure demonstrates better mechanical properties compared to traditional monolithic materials.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Ceramics
Aref Basiri, Amir Hossein Nassajpour-Esfahani, Mohammad Reza Haftbaradaran-Esfahani, Amir Alhaji, Ali Shafyei
Summary: This study investigated the granulation process of magnesium aluminate spinel powders using spray freeze drying method. The optimal amount of binder was found to be 3%, and the ideal solid load was determined to be 35 wt%, resulting in granules of 10-50 μm in size. Powder granulation increased density by approximately 20% and improved the in-line transmission for the IR range by over 15%.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Xinyu Yang, Ke Wang, Cunchao Dong, Hefa Cheng, Cunliu Han, Shifeng Luo, Jiuxing Zhang
Summary: Ultra-high temperature HfB2 ceramic with nearly full densification is achieved by gradient sintering process of SPS without any additives. The highest relative density of 96.75% is obtained at T =1950 degrees C, P = 60 MPa and t =10min. The HfB2 ceramic obtained at T =1950 degrees C exhibits the highest hardness of 26.34 +/- 2.1GPa, fracture toughness of 7.12 +/- 1.33 MPa m1/2 and bending strength of 501 +/- 10MPa.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Penghui Li, Mengdong Ma, Yingju Wu, Xiang Zhang, Yukai Chang, Zewen Zhuge, Lei Sun, Wentao Hu, Dongli Yu, Bo Xu, Zhisheng Zhao, Junyun Chen, Julong He, Yongjun Tian
Summary: By using nano-sized powders and SPS technology, high-density B4C ceramics were prepared with enhanced mechanical properties. Under the optimal SPS condition, the sample exhibited improved Vickers hardness, fracture toughness, and flexure strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Mao Chen, Fan Zhang, Hailong Wang, Gang Shao, Bingbing Fan, Rui Zhang, Hongxia Li, Yongqiang Chen
Summary: Dense h-BN/ZrO2(30 wt%) composites were fabricated by spark plasma sintering without additives. The composites were characterized for their relative density, apparent porosity, fracture toughness, flexural strength, phase composition, and microstructure. Furthermore, the corrosion resistance of the composites in molten steel was investigated, with the results showing excellent corrosion resistance attributed to the ZrO2 residual layer at the interface. The composites exhibited potential for application in fabricating thin strip continuous casting side sealing plates.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
M. Suarez, D. Fernandez-Gonzalez, L. A. Diaz, F. Diologent, L. F. Verdeja, A. Fernandez
Summary: The study successfully sintered ZrCu39.85Y2.37Al1.8 metallic glass using SPS technology, achieving almost 100% relative density and excellent mechanical properties at 390 degrees C. Sintering at temperatures higher than 390 degrees C resulted in sample crystallization, but the metallic glass shows promise for applications in the jewelry industry.
Article
Materials Science, Multidisciplinary
Yuan Zhang, Guoqi Tan, Da Jiao, Jian Zhang, Shaogang Wang, Feng Liu, Zengqian Liu, Longchao Zhuo, Zhefeng Zhang, Sylvain Deville, Robert O. Ritchie
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2020)
Article
Materials Science, Ceramics
Ronan Henry, Hassan Saad, Aurelien Doitrand, Sylvain Deville, Sylvain Meille
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Physics, Applied
Felix Ginot, Theo Lenavetier, Dmytro Dedovets, Sylvain Deville
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Marion Le Guellec, Florent Lebreton, Laure Ramond, Abibatou Ndiaye, Thierry Gervais, Guillaume Bernard-Granger
SCRIPTA MATERIALIA
(2020)
Article
Materials Science, Ceramics
Julie Simeon, Florent Lebreton, Laure Ramond, Florian La Lumia, N. Clavier, Guillaume Bernard-Granger
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Nanoscience & Nanotechnology
Kaoutar Radi, Hassan Saad, David Jauffres, Sylvain Meille, Thierry Douillard, Sylvain Deville, Christophe L. Martin
Summary: This study introduced a novel method to model the complex morphology of brick and mortar materials by combining Discrete Element Method and Electron Backscatter Diffraction images. The research investigated the effect of microstructural variations on crack propagation and damage resistance, showing a significant decrease in mechanical properties compared to the regular microstructure of nacre.
SCRIPTA MATERIALIA
(2021)
Article
Multidisciplinary Sciences
Sidhanth Tyagi, Cecile Monteux, Sylvain Deville
Summary: This study investigates the interaction of multiple oil droplets with an ice-water front in the presence or absence of solute effects. The results suggest that object size, number, and bulk solute concentration can influence the object-front interaction, front morphology, and subsequent object distribution. Incorporating the volume fraction of objects in a liquid melt and bulk solute concentration are proposed as important parameters for object-front interaction models.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Ceramics
N. Abando, H. Saad, M. A. Monclus, S. Deville, J. Molina-Aldareguia, J. J. Roa
Summary: Improving toughness in advanced ceramics often involves introducing a soft phase, which may reduce mechanical properties. Natural materials, with mechanisms operating at different length scales, demonstrate strength, stiffness, and toughness. Hardness decreases significantly with temperature in a bioinspired ceramic-ceramic composite.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
C. Lafond, T. Douillard, H. Saad, S. Deville, S. Meille, Ph. Steyer, S. Cazottes, C. Langlois
Summary: This study successfully demonstrated orientation mapping at an accelerating voltage lower than 5 kV for the first time, and confirmed that the 1 kV eCHORD method showed good agreement with the 15 kV EBSD method in texture measurements of the sample. Potential issues associated with using such a low accelerating voltage for eCHORD measurements were also discussed.
Review
Chemistry, Multidisciplinary
Sylvain Deville, Antoni P. Tomsia, Sylvain Meille
Summary: Nature has the ability to produce diverse materials with elegant and complex structures using a limited selection of components and ambient temperature. One example is nacre, which exhibits exceptional fracture toughness compared to its constituent mineral. This ability has sparked interest in bioinspired materials design. The ice templating technique, which involves freezing a particle suspension and then freeze-drying the ice to create a porous scaffold, has been successful in replicating the microstructure of nacre. The resulting composites exhibit crack deflection and enhanced damage resistance.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Materials Science, Ceramics
Ronan Henry, Hassan Saad, Sandrine Dankic-Cottrino, Sylvain Deville, Sylvain Meille
Summary: In this study, the addition of zirconia particles was investigated to enhance the mechanical properties of nacre-like alumina ceramic composite. It was found that tetragonal zirconia improves the fracture resistance properties of the composite.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Hassan Saad, Thierry Douillard, Annie Malchere, Philippe Steyer, Sylvain Meille, Sylvain Deville, Bruno Reynard
Summary: Nacre-like aluminas are bio-inspired ceramic composites with high toughness and strength attributed to their brick-and-mortar microstructure. In situ imaging techniques reveal that stress concentrates around locally disordered zones, delaying crack propagation. Larger-than-average alumina platelets or misaligned platelet bundles act as obstacles to crack propagation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Sebastien Vry, Marilyne Roumanie, Pierre-Alain Bayle, Sebastien Rolere, Guillaume Bernard-Granger
Summary: Silres H62C is a promising SiC precursor for 3D printing based on photopolymerization. Its structure and functional groups were determined through in-depth nuclear magnetic resonance analysis. The resulting polysiloxane has a highly branched ladder-like structure and can be cross-linked to form ceramic.
CERAMICS-SWITZERLAND
(2022)
Article
Chemistry, Physical
Sidhanth Tyagi, Cecile Monteux, Sylvain Deville
Summary: This passage discusses the interaction of soft or rigid particles suspended in a liquid melt with an advancing solidification front, and how this interaction affects the microstructure and functional properties of the solidified material.
Article
Materials Science, Ceramics
Sebastien Vry, Marilyne Roumanie, Richard Laucournet, Guillaume Bernard-Granger
CERAMICS-SWITZERLAND
(2020)
