Article
Chemistry, Physical
Anna Knaislova, Vendula Simunkova, Pavel Novak, Filip Prusa, Marcello Cabibbo, Lucyna Jaworska, Dalibor Vojtech
Summary: Intermetallic alloys based on Ti-Al-Si system are significant for their excellent high-temperature properties, but high brittleness at room temperature is a main concern. Adding alloying elements has been attempted to improve the properties, but porous microstructure remains a challenge.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Mohammad Abedi, Kirill Kuskov, Dmitry Moskovskikh, Elena Zakharova, Dmitry Belov, Alexander Mukasyan
Summary: Reactive spark plasma sintering (RSPS) is an effective method for consolidating refractory compounds, and the choice of SP parameters can influence the reaction mode and overall densification. The comparison of RSPS and SPS schemes for a highly reactive system shows that the reactive mode leads to higher densification. Two RSPS strategies are identified based on the analysis of microstructures and mechanical properties.
Article
Chemistry, Physical
Kan Chen, Ruizhi Zhang, Jan-Willem G. Bos, Michael J. Reece
Summary: The successful synthesis of a single-phase high-entropy half-Heusler compound through mechanical alloying and spark plasma sintering allows for a homogeneous distribution of multiple elements in the samples. The stability of the samples, as well as the ability to exhibit both n-type and p-type semiconductor behavior by adjusting the Fe/Co ratio, indicate the promising potential of the high-entropy concept in extending composition range and tuning thermoelectric properties for half-Heusler materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
A. M. Vilardell, L. Pelcastre, D. Nikas, P. Krakhmalev, M. Kato, N. Takata, M. Kobashi
Summary: Prealloyed Fe3Al with high density, good surface quality, and suitable mechanical properties was successfully manufactured using laser powder bed fusion. The presence of minor variations in aluminum content along the melt pool and the development of a weak texture along the building direction were observed in the microstructure. The mechanical properties were found to be temperature-dependent, with a significant loss in strength at higher temperatures due to plastic deformation and tribochemical wear.
Article
Materials Science, Multidisciplinary
Syed Nasimul Alam, Pankaj Shrivastava, Deepankar Panda, Bhagavant Gunale, Kunapuli Susmitha, Pridvuraj Pola
Summary: In this research, the alloy composition of Al-33.33 at% Cu was used to study the effect of milling duration on the synthesis of Al2Cu intermetallic compound. Various analytical techniques were employed to analyze the synthesized powders. The results confirmed the successful synthesis of nanostructured Al2Cu through mechanical alloying and annealing.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Serhii Teslia, Anatoliy Stepanchuk
Summary: In this study, Al-15 wt % Fe powders were prepared using two methods and the effects of milling time and temperature field distribution during atomization on the morphology and microstructure were investigated. It was found that centrifugal atomization resulted in a microstructure with reinforcing effects, consisting of alpha-Al-matrix, stable Al13Fe4, and randomly oriented short fibres of metastable Al6Fe.
Article
Chemistry, Physical
Ashok K. Verma, P. Modak
Summary: This study examines the high pressure structural aspects of thorium dialuminide, ThAl2, and predicts a phase transition from the ambient AlB2-type hexagonal structure to a P6(3)/mmc hexagonal structure above 2.4 GPa. The new structure remains stable up to 50 GPa, indicating a different behavior from previous findings. Analysis of electronic structures and chemical bonding reveals that a change in Al-Al bonding under pressure is responsible for the structural phase transition. Additionally, a high P-T phase diagram is computed, showing that a MgCu2-type structure becomes stable only under high P-T conditions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Mohammad Mahdi Taghvaei, Hossein Mostaan, Mahdi Rafiei, Hamid Reza Bakhsheshi-Rad, Filippo Berto
Summary: Nanostructured powder particles of Fe3Al and (Fe,Ti)3Al phases were synthesized using mechanical alloying and consolidated by spark plasma sintering. The mechanical properties, including elasticity modulus, hardness, and plasticity index, as well as the tribological behavior of the samples, were evaluated using nanoindentation and nano-scratch tests. The addition of Ti improved the mechanical properties of the Fe3Al system, and the (Fe,Ti)3Al compound exhibited better tribological properties compared to Fe3Al.
Article
Chemistry, Physical
Eva Gil-Gonzalez, Maria del Rocio Rodriguez-Laguna, Pedro E. Sanchez-Jimenez, Antonio Perejon, Luis A. Perez-Maqueda
Summary: Mechanochemistry has attracted significant attention in recent decades, although the conversion of mechanical energy into chemical energy remains poorly understood. Neglecting experimental parameters makes reproducibility of results challenging. The proposed kinematic-kinetic approach offers a reliable method for parametrizing and modeling mechanically induced reactions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Crystallography
Santosh Sampath, Vignesh Pandian Ravi, Srivatsan Sundararajan
Summary: Nickel aluminides possess desirable properties for high-temperature applications, but the challenges of processing and machining hindered their benefits in the 1990s. However, advancements in manufacturing techniques, understanding of aluminide microstructure and deformation processes, and developments in micro-alloying have contributed to the progress of nickel aluminides. This paper provides a comprehensive overview of the key developments, manufacturing methods, and challenges in producing nickel aluminides, as well as their applications and current trends.
Article
Materials Science, Multidisciplinary
Cheng Sun, Mukesh N. Bachhav, Yongqiang Wang, Meimei Li, Stuart A. Maloy
Summary: This study focused on the order-disorder transformation kinetics of the L1(2)-structured γ-Π phase in nickel-based superalloys under irradiation, revealing that pre-implanted helium gas bubbles significantly enhance the phase transformation process, effectively trapping irradiation-induced vacancies.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
M. R. Akbarpour, S. Alipour, M. Najafi, T. Ebadzadeh, H. S. Kim
Summary: This study investigated the rapid synthesis of nanostructured NiTi-Ni3Ti intermetallic alloy from titanium and nickel powders through mechanical alloying followed by microwave-assisted sintering process. The research found that the sintering temperature had a significant impact on the density, porosity, and microhardness of the samples, with the highest density and microhardness achieved at a sintering temperature of 1100 degrees C. The results suggest that microwave-assisted sintering can be utilized to fabricate Ni-Ti alloys with improved mechanical properties for biomedical applications.
Article
Chemistry, Physical
Marek Krasnowski, Stanislaw Gierlotka, Dariusz Zasada
Summary: The paper describes a composite material with a matrix containing a nanocrystalline intermetallic phase Al13Fe4 and microcrystalline aluminium. The material was synthesized at a high temperature and pressure, and a phase transformation of the nanocrystalline phase was observed. The resulting composite material has high hardness and compressive strength, while also exhibiting some plasticity.
Article
Materials Science, Multidisciplinary
Andrea Skolakova, Jana Korberova, Petr Kratochvil, Pavel Salvetr, Davy Deduytsche, Pavel Novak
Summary: In this study, Ni-14Al, Ni-30Al, and Ni-58Al alloys representing Ni3Al, NiAl, and NiAl3 phases were prepared by reactive sintering. The preferential formation of Ni2Al3 phase in all alloy compositions was observed, which was controlled by diffusion.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Xuesong Yang, Xuewen Li, Tongtong Zhang, Chao Xu, Guohua Fan, Jie Zhang
Summary: A novel laminated TiAl matrix composite with alternating equiaxed grain layers and fully lamellar grain layers was successfully fabricated using hot pressing and multi-step reaction annealing. The oxidation behavior of the composite at 800 degrees C was studied, showing a typical multilayer oxide scale structure. Although there were differences in oxidation behavior between different grain layers, the thickness of the oxide scale was almost identical, indicating isotropic oxidation resistance. The addition of Si effectively enhanced the oxidation resistance of the composite.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.