Article
Materials Science, Multidisciplinary
Luciano Eliezer Ramirez-Vidaurri, Manuel Castro-Roman, Martin Herrera-Trejo, Karla-Leticia Fraga-Chavez
Summary: The solidification evolution of an ASTM F75 alloy during directional cooling was studied, revealing that the solid grows most rapidly in a temperature range of approximately 200 degrees Celsius, reaching a solid fraction of about 0.8-0.9, with the coarsening of Secondary Dendrite Arm Spacing (SDAS) mainly occurring during this period.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Ang Zhang, Zhipeng Guo, Bin Jiang, Jinglian Du, Cuihong Wang, Guangsheng Huang, Dingfei Zhang, Feng Liu, Shoumei Xiong, Fusheng Pan
Summary: This study developed a solid-liquid-gas multiphase field lattice Boltzmann model to describe the complex interaction during solidification. The model was successfully validated and compared to other models, effectively describing the interaction between gas porosity and magnesium dendrite. It is suitable for exploring multiphase equilibrium and addressing problems involving solid-liquid-gas multiphase and multiphysical characteristics.
Article
Materials Science, Multidisciplinary
Lei Wang, He Li, Yan Song, Jialiang Ding, Runhuan Cai, Yong Peng, Yong Huang, Kehong Wang
Summary: In this study, a macro-micro VOF-PF model was developed to simulate the heat transfer, dendrite growth, and Nb segregation during laser IN718 deposition. The results showed that the model accurately predicted the primary dendrite arm spacing and solute distribution, demonstrating its precision and reliability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
Guo Dongwei, Guo Kunhui, Zhang Fuli, Zhang Fei, Cao Jianghai, Hou Zibing
Summary: High-end steel products are important for economic development and infrastructure projects. Continuous casting is an important production process for these products, but internal segregation defects can affect their quality and properties. This study focuses on the determination of columnar to equiaxed transition (CET) in the solidification structure of continuous casting billets. By measuring and analyzing the secondary dendrite arm spacing (SDAS), the researchers found a mutation of SDAS during the solidification process. Based on this mutation, they proposed a new method for quantitatively determining CET in continuous casting billets.
ACTA METALLURGICA SINICA
(2022)
Article
Chemistry, Physical
Zhibo Jin, Xiangwei Kong, Liang Ma, Jun Dong, Xiaoting Li
Summary: Based on multi-scale simulations, the study found that the temperature gradient and solidification rate in laser cladding are crucial for nickel-based superalloys, especially in terms of primary dendrite arm spacing.
Article
Engineering, Industrial
Xingxing Li, Xinghai Yang, Chengpeng Xue, Shuo Wang, Yuxuan Zhang, Quan Li, Yisheng Miao, Junsheng Wang
Summary: In this study, a 3D multi-component cellular automata model coupled with thermodynamic calculations was used to simulate and predict the evolution of hydrogen microporosity during the solidification of aluminum-lithium alloys. The simulation results were validated through experimental characterization using X-ray computed tomography, providing crucial information for the fabrication of aluminum-lithium alloy products and the design of integrated computational materials engineering (ICME).
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Polymer Science
Takahiro Murashima, Toshihiro Kawakatsu, Katsumi Hagita
Summary: In this study, dissipative particle dynamics simulations were used to investigate the control of lamellar domain spacing in pure melts and blends of different block copolymers. The simulations confirmed theoretical predictions for linear and ring block copolymers, but the values obtained for star block copolymers were slightly larger. By analyzing the profiles of interfaces between lamellar domains at different length scales, the effects of thermal fluctuation were quantitatively estimated, and it was found that ring block copolymers exhibit larger effects than star or linear block copolymers. Furthermore, in a polymer blend of linear and nonlinear block copolymers with the same polymerization degree, the domain spacing decreased monotonically with the molar fraction of the ring or star polymer. Therefore, star block copolymers are preferred over ring block copolymers for adjusting the domain spacing in a polymer blend.
Article
Crystallography
Andras Roosz, Arnold Ronafoldi, Yuze Li, Nathalie Mangelinck-Noel, Gerhard Zimmermann, Henri Nguyen-Thi, Maria Sveda, Zsolt Veres
Summary: In this study, solidification experiments were conducted on the International Space Station to investigate the effect of solidification parameters on the grain structure and dendritic microstructure of Al-Si alloy. The analysis also focused on the macrosegregation caused by diffusion and the distribution of eutectic along the solidification direction. The results showed good agreement between the experimental and simulated data.
Article
Chemistry, Physical
V. A. Aranda, I. A. Figueroa, V Amigo, R. Gonzalez-Ojeda, O. Lozada, A. L. Vidilli, L. B. Otani, G. Gonzalez
Summary: In this work, the mechanical properties of a Ti-Nb-Ta-Zr alloy were improved by adjusting the composition with phase equilibria simulation and adding Mo. X-ray spectroscopy characterization showed that Ta and Nb segregated in the BCC1 phase, while Zr and Ti segregated in the BCC2 phase. The mechanical properties were related to the chemical differences between the BCC1 and BCC2 lattice parameters induced by the Mo addition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Aitao Zhou, Zhiyuan Xu, Kai Wang, Yanhai Wang, Jingyu An, Zhan Shi
Summary: Gas drainage is a key measure to prevent coal and gas disasters. This study combines numerical simulation and field experiment to optimize the extraction parameters of intubation spacing and extraction negative pressure in Buertai Coal Mine. A three-dimensional gas distribution model is established and COMSOL software is used for calculation. The results show that ideal gas drainage effect can be achieved at a negative pressure of 12-18 kPa within the range of 50 m-70 m.
Article
Materials Science, Multidisciplinary
Xiaoping Ma, Hongwei Liu, Paixian Fu, Dianzhong Li
Summary: The study investigated the microstructures and segregations during solidification, revealing nano-scale dendrites within conventional dendrites. Conventional dendrites should be viewed as macrosegregation patterns in a subtle porous media, leading to a shift in research focus for microsegregation. Temperature fluctuations induce dendritic temperature field on multi-scales, resulting in dendritic macrosegregation field induced by mass transfer. In situ observation confirmed the emergence of subtle dendrites at lower temperatures than equilibrium eutectic temperature, leading to new solutions for controlling macrosegregation within conventional dendritic arm. The nano-scale dendrites provide the basis for unifying non-equilibrium and equilibrium solidification.
MATERIALS & DESIGN
(2021)
Article
Crystallography
Andras Roosz, Arnold Ronafoldi, Maria Sveda, Zsolt Veres
Summary: The physical and mechanical properties of solidified alloys strongly depend on the secondary dendrite arm spacing (SDAS). The SDAS can be calculated using empirical or semi-empirical methods. This study demonstrates that numerically integrated Kirkwood's equations can accurately calculate the SDAS in good agreement with experimental results.
Article
Metallurgy & Metallurgical Engineering
Zhi-Yu He, Hua-Bing Li, Zhuo-Wen Ni, Hong-Chun Zhu, Zhou-Hua Jiang, Hao Feng, Dong-Sheng Mao
Summary: The research indicates that increasing pressure mainly refines SDAS by enlarging cooling rate. Pressurization can enhance columnar dendrite tip growth rate by increasing undercooling and inhibit equiaxed dendrite nucleation and growth by decreasing constitutional undercooling. The formula for calculating columnar dendrite tip growth rate with undercooling is suitable for low pressure (<= 2 MPa).
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
C. Grazia Bezzu, Alessio Fuoco, Elisa Esposito, Marcello Monteleone, Mariagiulia Longo, Johannes Carolus Jansen, Gary S. Nichol, Neil B. McKeown
Summary: By incorporating Trip units into PIM-1, ultrapermeable PIMs are prepared, showing extremely high CO2 permeance after methanol treatment. These novel polymers exhibit potential applications in capturing CO2 from flue gas or upgrading biogas.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Chemical
Yu Dong, Qing Zhu, Wenhao Zou, Junkai Fang, Zhengjin Yang, Tongwen Xu
Summary: The separation of lithium isotopes through membrane-based technologies is a challenging research direction due to the similarities in physicochemical properties of 6Li+ and 7Li+. In this study, we developed a dibenzo-15-crown-5-based polymeric membrane, PIM-DB15C5-TB, for lithium isotope separations. The membrane exhibited good 6Li+/7Li+ selectivity and abundant free volumes for 6Li+/7Li+ transport. By applying this membrane in electrodialysis, a 6Li+/7Li+ selectivity of 1.16 was achieved. This work proposes a strategy for developing polymeric membranes for selective separation of lithium isotopes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ali Kheirabi, Amir Baghani, Ahmad Bahmani, Morteza Tamizifar, Parviz Davami, Mohsen Ostad Shabani, Ali Mazahery
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2018)
Article
Metallurgy & Metallurgical Engineering
Mohsen Ostad Shabani, Fatemeh Heydari, Ali Asghar Tofigh, Mohammad Reza Rahimipour, Mansour Razavi, Ali Mazahery, Parviz Davami
PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES
(2016)
Article
Materials Science, Multidisciplinary
M. Shamsipour, Z. Pahlevani, M. O. Shabani, A. Mazahery
KOVOVE MATERIALY-METALLIC MATERIALS
(2017)
Article
Metallurgy & Metallurgical Engineering
Mohsen Ostad Shabani, Majid Shamsipour, Ali Mazahery, Zahra Pahlevani
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2018)
Article
Chemistry, Physical
Mohsen Ostad Shabani, Fatemeh Heydari, Ali Khorram
Article
Metallurgy & Metallurgical Engineering
Mohsen Ostad Shabani, Fatemeh Heydari
PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES
(2019)
Article
Chemistry, Physical
Mohsen Ostad Shabani, Amir Baghani, Ali Khorram, Fatemeh Heydari
Article
Metallurgy & Metallurgical Engineering
Amir Baghani, Hamid Khalilpour, Seyed Mandi Miresmaeili
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2020)
Article
Materials Science, Composites
Mohsen Ostad Shabani, Amir Baghani, Mohammad Reza Rahimipour, Mansour Razavi, Mohammad Zakeri, Fatemeh Heydari
Summary: This study investigated the effects of different casting methods and stirring currents on the microstructural morphology of A356-Al2O3 composites, as well as the influence of shear forces on the formation of globular-like structures. The optimal fabrication temperature and time for this type of composite were calculated, and the relevant microstructures were thoroughly discussed using optical emission microscopy and image analysis system.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mohsen Ostad Shabani, Amir Baghani, Mohammad Reza Rahimipour, Mansour Razavi, Mohammad Zakeri, Fatemeh Heydari
Summary: In a mixer-settler, the optimal conditions can be calculated using the PSO algorithm and finite volume method, including the number of baffles, inlet velocity of fluid, and impeller speed, and these results can be extended to industrial scale.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2021)
Article
Metallurgy & Metallurgical Engineering
Mohsen Ostad Shabani, Amir Baghani, Mohammad Reza Rahimipour, Mansour Razavi, Mohammad Zakeri, Hadi Zadsar
Summary: This study investigates the effect of casting type on the mechanical and tribological properties of A356-Al2O3 nano composites. The results show that the tensile strength is higher in compo casting samples in semi-solid state, and the heat-treated samples have a 30% increase in tensile strength.
PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES
(2022)
Article
Materials Science, Multidisciplinary
Mohsen Ostad Shabani, Amir Baghani, Mohammad Reza Rahimipour, Mansour Razavi, Mohammad Zakeri, Fatemeh Heydari
Summary: This study investigates the effect of casting methods, content and size of reinforcing particles, and heat treatment on the mechanical properties of A356-Al2O3 composite. It was concluded that superior mechanical properties were obtained in samples made by semi-solid compo casting using nanoscale reinforcing secondary phase and subjected to the T6 heat treatment.
KOVOVE MATERIALY-METALLIC MATERIALS
(2022)
Article
Metallurgy & Metallurgical Engineering
Amir Baghani, Ali Kheirabi, Ahmad Bahmani, Hamid Khalilpour
Summary: The tensile strength of aluminum castings has been improved by employing surge and filter in a conventional non-pressurizing gating system, reducing defects and increasing reliability. It was found that appropriately using surge in the running system can be as effective as employing a filter in reducing melt front velocity.
ARCHIVES OF METALLURGY AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
A. Khorram, M. Paidar, M. O. Shabani
LASERS IN ENGINEERING
(2019)
Article
Materials Science, Multidisciplinary
Mohsen Ostad Shabani, Fatemeh Heydari
INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY
(2018)
