Article
Materials Science, Multidisciplinary
Dianchao Gao, Ailing Fan, Haotian Zhang, Miao Du, Jing Mi, Lei Hao, Shuai Li
Summary: FeSiAl films were prepared by magnetron sputtering and heat-treated in different atmospheres. The composition, microstructure, and static magnetic and electromagnetic properties of the films were investigated. An insulating oxide layer formed on the heat-treated films significantly affected their resistivity, saturation magnetization strength, and electromagnetic properties. The films heat-treated in vacuum exhibited high resistivity and excellent electromagnetic properties, with a saturation magnetization strength of 2190 emu/cm3 and resistivity of 250.5 mu omega/cm. The films also showed excellent microwave attenuation performance, with a ferromagnetic resonance frequency of 1.8 GHz and an extrema of the imaginary part of the complex permeability reaching 1699, almost 7.4 times higher than the as-deposited FeSiAl film.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Zhanjiang Li, Xuekun Ding, Li Chen, Jichang He, Junfeng Chen, Jia Chen, Nengbin Hua, Pinqiang Dai, Qunhua Tang
Summary: This study systematically investigated the effects of Si content and annealing temperature on the microstructural evolution and tensile properties of FeCoCrNiMnSix high-entropy alloys. The results showed that increasing Si content led to an increase in alloy strength and a decrease in recrystallization ratio during annealing. By changing the CRA temperature and Si content, a heterogeneous grain structure with high yield strength and good ductility was obtained.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
S. Dasari, A. Jagetia, A. Sharma, M. S. K. K. Y. Nartu, V Soni, B. Gwalani, S. Gorsse, R. Banerjee
Summary: By utilizing the binary enthalpies of mixing in a Co-Cr-Fe-Ni base alloy system, a high entropy alloy (HEA) or complex concentrated alloy (CCA) has been identified as equiatomic CoFeNi solid solution, and the degree of chemical ordering within the alloy has been systematically engineered by adding controlled amounts of Al and Ti. This change in chemical ordering significantly influences the tensile yield strength of the alloy, ranging from 181 MPa for CoFeNi to 793 MPa for the Al0.3Ti0.2Co0.7FeNi1.7 CCA. The experimentally measured yield strengths of the candidate CCAs are in close agreement with predicted values afforded by simple strengthening models.
Article
Materials Science, Multidisciplinary
Lu Feng, Wanchong Li, Yan Wang
Summary: Researchers in this study utilized a metamaterial designing method to optimize FeSiAl alloy for improved electromagnetic wave absorption properties. By adjusting the macrostructural size, absorption performance could be easily regulated, resulting in a well-performing broadband FeSiAl metamaterial.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Peter-Philipp Bauer, Lisa Klamann, Radoslaw Swadzba, Nadine Laska
Summary: Intermetallic Al-Si-based coatings can improve the oxidation resistance of gamma-TiAl alloys. The optimal Si content for oxidation resistance is still uncertain. Si additions in the range of 1 to 12 at.% do not deteriorate the oxidation resistance, while higher Si contents lead to greater mass gain. The thickness of the coatings is important for good oxidation resistance.
Article
Materials Science, Multidisciplinary
Jyoti Ranjan Sahoo, Bhanu Pratap Singh, Sumeet Mishra
Summary: Finite element and digital image correlation assisted mechanical tests were conducted to assess the formability characteristics of a preaged Al-Mg-Si alloy. It was observed that an increase in preageing temperature led to a significant decrease in work hardening ability and strain rate sensitivity, which in turn had adverse effects on formability parameters such as uniform and non-uniform elongation.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ruojin Zang, Lipeng Ding, Flemming J. H. Ehlers, Zhihong Jia, Shaoqiang Xu, Yanjun Li, Lingfei Cao
Summary: The strength and formability of four 6000 series alloys were studied in relation to the Mg/Si ratio and Cu content. The results showed that alloy composition affects these properties through microstructural factors such as intermetallic particles, grain size, texture, and precipitates. Higher Mg and Cu contents led to lower yield strength in one temper condition but higher strength after paint baking. The Mg-rich alloys exhibited better formability due to the lower fraction of coarse intermetallic particles controlled by the Mg/Si ratio.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Guilherme Lisboa de Gouveia, Amauri Garcia, Jose Eduardo Spinelli
Summary: Magnesium-silicon alloys were studied for their microstructural characteristics and tensile properties, with variations in solidification cooling rate and silicon content. The increase in silicon content led to a reduction in strength and ductility, likely due to the increase in Mg2Si particles.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Igor A. Petrov, Anastasiya D. Shlyaptseva, Alexandr P. Ryakhovsky, Elena V. Medvedeva, Victor V. Tcherdyntsev
Summary: Modification of eutectic silicon in Al-Si alloys is extensively used in the industry to improve mechanical properties. This study discusses the effects of rubidium modification on eutectic silicon in Al-Si alloys. Experimental data shows that rubidium affects the growth of silicon and is distributed relatively homogeneously in the silicon phase. Microstructural studies demonstrate that rubidium effectively refines eutectic silicon and changes its morphology. The addition of rubidium lowers the solidus temperature and extends the solidification range, resulting in improved mechanical properties when the rubidium content is in the range of 0.007-0.01%.
Article
Materials Science, Multidisciplinary
L. Esteves, J. Christudasjustus, S. P. O'Brien, C. S. Witharamage, A. A. Darwish, G. Walunj, P. Stack, T. Borkar, R. E. Akans, R. K. Gupta
Summary: By adding V and utilizing high-energy ball milling, AA5083 alloys were modified to form a supersaturated solid solution and grain refinement below 100 nm, significantly improving the corrosion resistance of the alloy.
Article
Materials Science, Multidisciplinary
Bo Dang, Zengyun Jian, Junfeng Xu
Summary: The effects of different cerium-rich rare earth contents on Al-70 wt%Si alloys were investigated using electromagnetic levitation. The nucleation and growth, growth mode, and morphology evolution of primary Si were observed. Results showed that with an increasing RE content, the critical undercooling gradually decreased.
Article
Engineering, Electrical & Electronic
T. Bartoli, W. Bouzidi, F. Z. Rachid, R. Moubah, H. Lassri, J. Moscovici, L. Bessais
Summary: Nanocrystalline iron-rich intermetallic compounds Sm2Fe17-xSix were studied for their crystal structure, magnetic properties, and magnetocaloric performance. It was found that an increase in Si content led to higher Curie temperature but lower magnetocaloric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Xiang Yu, Zhi Li, Padam Jain, Huajian Gao, Sharvan Kumar
Summary: Increasing Si content enhances the yield strength of Mo alloys, except for the softening phenomenon observed in the 0.1 wt.% Si alloy at room temperature. Tensile ductility decreases rapidly with increasing Si content in solid solution, but the Mo-0.3 wt.% Si solid solution alloy exhibits around 10% tensile ductility at 300 degrees C.
Article
Chemistry, Physical
Piotr Mikolajczak
Summary: Natural convection exists in all liquid alloys, while forced convection can be used to improve material properties. By studying the solidification in simple cylindrical samples using a rotating magnetic field with a low cooling rate and low temperature gradient, the effect of forced convection was investigated. The research focused on the composition of Al-Si-Fe alloys and the resulting modifications in structure and phases. The findings suggested that stirring led to the formation of rosette structures, altering dendrite spacing and specific surface area, and modifying certain phases. Additionally, the melt flow caused a modification in iron-rich phases and their redistribution within the alloy sample.
Article
Chemistry, Physical
Lei Jia, Linwen Jiang, Wenli Zheng, Jingwu Wu, Junli Feng
Summary: FeCoNiMnSix (x = 0.1, 0.2, 0.3, 0.4, and 0.5) high entropy alloys were synthesized using a novel high-energy ball-milling technique. The phase structure transformed from FCC to BCC when the Si content reached 0.3. Si dramatically minimized the oxidation level at high temperatures, improving the high-temperature oxidation resistance. The addition of Si had a slight influence on the corrosion resistance and also reduced magnetic loss, promoted impedance matching, and improved electromagnetic-wave loss capabilities. FeCoNiMnSi0.3 exhibited good electromagnetic-wave absorption capability with a minimum reflection loss value of -48.6 dB at 4.24 GHz and an effective absorption width of 4.81 GHz at 2.03 mm thickness. This study is important for the investigation of electromagnetic-wave materials with practical applications at high temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
