Article
Chemistry, Physical
T. Chen, C. Yang, Z. Liu, H. W. Ma, L. M. Kang, Z. Wang, W. W. Zhang, D. D. Li, N. Li, Y. Y. Li
Summary: The use of TiH2 powder as a sintering precursor shows potential for producing nearly full-density titanium and titanium alloys with superior mechanical properties. The study reveals a two-step sintering strategy that demonstrates the dehydrogenation effect and densification mechanism of TiH2 powder during pressureless sintering. Results indicate that TiH2 powder exhibits significant advantages over HDH-Ti powder in terms of densification rate, grain size, strength, and ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Multidisciplinary
T. Chen, W. S. Cai, Z. Liu, H. W. Ma, S. G. Qu, W. W. Zhang, C. Yang
Summary: This study establishes a methodology for in-situ dual-deoxidation to fabricate advanced titanium matrix composites using pressureless sintering. By utilizing this method, advanced TMCs with in-situ La2O3 particle and TiB whisker are successfully produced, exhibiting advantages such as reduced oxygen content, refined grains, and avoidance of pores. These advanced TMCs overcome the strength-ductility trade-off issue.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
T. Chen, H. Z. Lu, W. S. Cai, L. H. Liu, Z. Wang, C. Yang
Summary: We discovered a new hierarchical microstructure in ultrastrong Ti-6Al-4V composite with TiC reinforcement fabricated via pressureless sintering. The hierarchical microstructure consists of primary thick β-Ti laths surrounding coarse equiaxed α-Ti zones, which consist of cellular structures with ultrafine equiaxed α-Ti matrix and nano/ultrafine β-Ti lamellar. The hierarchical structure originates from the inhibiting effect of nano TiC particles on β-Ti grain growth and their role as nucleation sites for α-Ti grains. The hierarchical composite exhibits ultrahigh tensile yield strength, surpassing Ti-6Al-4V alloy and its sintered composites.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Rezaei Ardani, Sheikh Abdul Rezan Sheikh Abdul Hamid, Hooi Ling Lee, Abdul Rahman Mohamed, Ismail Ibrahim
Summary: Thermodynamic assessment and experimental investigation were conducted on the formation of titanium hydride (TiH2) from the reaction between titanium tetrachloride (TiCl4) gas and magnesium hydride (MgH2) powder under hydrogen atmosphere. The results showed that producing TiH2 at low temperature by reducing TiCl4 with MgH2 is feasible and has significant potential for low-cost synthesis of Ti powder.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Chemistry, Physical
Ali Shaaban, Hirotoyo Nakashima, Mitsutoshi Ueda, Masao Takeyama
Summary: This study investigated the effects of oxygen addition on TiAl alloys at 1023 K, finding that it stabilized the alpha phase, reduced oxidation mass gains, and altered microstructure and phase transformations without significantly affecting oxidation resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
A. G. Aleksanyan, S. K. Dolukhanyan, O. P. Ter-Galstyan, G. N. Muradyan, N. L. Mnatsakanyan
Summary: The research focuses on developing a resource-saving and efficient technology for synthesizing Ti-6Al-4V alloy through the hydride cycle (HC) method, aiming to reduce the production cost of titanium alloys. The physicochemical, structural, and hydrogen-sorption characteristics of the alloy samples were thoroughly studied and optimized.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Marcel Rossetti, Gilberto da Silva Falk, Aloisio Nelmo Klein, Sergio Yesid Gomez Gonzalez, Cristiano Binder, Dachamir Hotza
Summary: This work presents a novel technology, Plasma-Assisted Rapid Sintering (PARS), for sintering nanoceramics using a pulsed DC plasma system in a hollow cathode regime. Experiments with nano-TiO2 powders show that PARS heating process is consistent and adjustable, allowing fast and homogeneous sintering with high relative density and nanoscale grains.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Behzad Nayebi, Mehdi Shahedi Asl, Maryam Akhlaghi, Zohre Ahmadi, Seyed Ali Tayebifard, Esmaeil Salahi, Mohammadreza Shokouhimehr, Mohsen Mohammadi
Summary: The TiB2-Ti3AlC2 ceramic was successfully manufactured using spark plasma sintering, with Ti3AlC2 additive decomposing at the initial stages of sintering. The final ceramic exhibited a near full density of around 99% and a hardness of approximately 28 GPa, with densification mechanism and sintering phenomena discussed and graphically illustrated.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Fan Kuang, Yu Pan, Jinshan Zhang, Xinxin Wu, Xin Lu
Summary: In this study, a high-performance Ti-6Al-4V alloy was fabricated from TiH2 and 60Al40V powder mixtures by powder metallurgy (PM) pressureless sintering and hot extrusion. The sintering temperature and hot extrusion microstructure were investigated, and their correlation with mechanical properties was analyzed. The results showed that the dehydrogenation of the mixed powder during sintering led to a fine, fully dense microstructure. The billets sintered at 1200 degrees C exhibited a denser lamellar microstructure, which contributed to improved strength and ductility after extrusion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Letter
Chemistry, Physical
Zhuo Zhang, Xiaoming Duan, Baofu Qiu, Lei Chen, Delong Cai, Peigang He, Zhihua Yang, Dechang Jia, Yu Zhou
Summary: In this study, h-BN composite ceramics were prepared using La2O3 and Al2O3 as additives to form liquid phases during sintering. The amorphization/nanocrystallization of raw h-BN powders by high-energy ball-milling significantly promoted grain growth during liquid-phase sintering, resulting in higher crystallization degree and thermal conductivity in the specimens.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Chemical
Shucheng Dong, Guangyu Ma, Peng Lei, Tuo Cheng, Dmytro Savvakin, Orest Ivasishin
Summary: The study demonstrated that using titanium hydride powder as a starting material in titanium powder metallurgy leads to materials with higher density and lower impurity content, providing a better balance of tensile properties compared to using HDH titanium powder.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Julie Simeon, Florent Lebreton, Laure Ramond, Nicolas Clavier, Guillaume Bernard-Granger
Summary: The sintering behavior of freeze-granulated UO2-PuO2 powders with different Pu content was studied, revealing that densification was controlled by grain boundary diffusion and grain growth by the grain boundaries. The sintered microstructure of samples with 98% density exhibited a homogeneous distribution of plutonium and uranium cations, independent of the Pu content.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Ricardo Mineiro, C. M. Fernandes, E. L. Silva, M. R. Soares, D. Figueiredo, B. Ferrari, A. J. Sanchez-Herencia, A. M. R. Senos
Summary: The Spark Plasma Sintering (SPS) technique was used to investigate the sintering process of cBN-TiCN based composites with and without the addition of Ni. The addition of Ni improved the densification of the material, but complete removal of open porosity and transformation of cBN phase to hBN phase only occurred at 1700°C. Other matrix phases, such as TiB2 and Ni3B, were also formed during the sintering process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Multidisciplinary
Michael Musi, Gloria Graf, Helmut Clemens, Petra Spoerk-Erdely
Summary: This review provides a detailed survey of the research work on the influence of technically important alloying elements on the Ti-Al phase diagram in γ-TiAl based alloys. After introducing the fundamentals of phase transformations, the alloying elements are discussed and their particularities are highlighted.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Thermodynamics
Svetlana A. Nikolaeva, Elena N. Lysenko, Evgeniy V. Nikolaev, Sergey A. Ghyngazov
Summary: The effect of mechanical activation of synthesized ferrite powder on the thermal sintering process of ferrite ceramics was studied. The total shrinkage of samples during sintering was found to increase with higher energy intensity of ferrite powder milling. Samples activated with 2 mm steel balls showed the best degree of complete compaction after sintering compared to those activated with 5 mm balls. Diffusion models were determined to be the best fit for modeling the sintering process through kinetic analysis.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
