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Formation of strong and ductile FeNiCoCrB network-structured high-entropy alloys by fluxing
Microstructures 2023;3:2023018. DOI: 10.20517/microstructures.2022.47AbstractA series of [(FeNiCo)0.85Cr0.15]100-xBx (x = 12, 15, 17) high-entropy alloys with network-like microstructures (N-HEAs) ... MOREA series of [(FeNiCo)0.85Cr0.15]100-xBx (x = 12, 15, 17) high-entropy alloys with network-like microstructures (N-HEAs) and a wavelength of 3-5 μm was prepared using the fluxing method. The novel N-HEAs exhibited higher strength and ductility compared with samples obtained by suction casting. Neutron diffraction and scanning electron microscopy measurements showed that the network-like structure contained soft face-centered cubic (FCC) and hard tetragonal Cr2B-type sub-networks. The network-like structure was formed during the solidification of the molten alloy from a deeply undercooled state, achieved by removing impurities and most metallic oxides throughB2O3 fluxing. The mechanical properties could be tuned by modifying the composition to change the volume fractions of the different sub-networks. When x decreased from 17 to 12, the compressive yield strength decreased from 1.6 to 1.1 GPa, while the compressive strain increased from ~20% to ~70%. The N-HEA samples with x = 12 and 15 also exhibited a good tensile ductility of 19% and 14%, respectively. In situ synchrotron X-ray diffraction results revealed an inhomogeneous deformation behavior, i.e., the soft FCC phase yielded prior to the hardCr2B-type phase, which bore more stress in the initial stage of the plastic deformation. In the later stage of the plastic deformation, the ductility of the sample was provided by the FCC phase, together with some contributions from the Cr2B-type phase. LESS Full articleResearch Article|Published on: 24 Mar 2023 -
Microstructural constructing 2D tin allotropes on Al(111): from quasi-periodic lattice to square-like lattice
Microstructures 2023;3:2023017. DOI: 10.20517/microstructures.2023.01AbstractThe lattice arrangement and degree of buckling have been playing vital roles in the structure ... MOREThe lattice arrangement and degree of buckling have been playing vital roles in the structure stability, bonding configuration, and electronic band structures of two-dimensional (2D) single-layer materials. Here, we fabricate two tin allotropes beyond honeycomb stanene by epitaxial growth method on Al(111). Sn-I phase with quasi-periodic lattice and Sn-II phase with square-like lattice have been identified by scanning tunneling microscopy. Combined with scanning tunneling spectroscopy, it is revealed that Sn-II phase with four-coordinate tin atoms exhibits enhanced decoupling effects due to their saturated bonds. In this study, the discovery of new lattice arrangements with well-defined atomic structures beyond honeycomb lattice provides an appealing approach to searching 2D elemental single layers and novel physical properties. LESS Full articleResearch Article|Published on: 14 Mar 2023 -
Commentary on “Heterogenous nature of enhanced piezoelectricity in relaxor-ferroelectric crystals”
Microstructures 2023;3:2023016. DOI: 10.20517/microstructures.2023.10Commentery|Published on: 9 Mar 2023 -
Novel casting CoCrNiAl eutectic high entropy alloys with high strength and good ductility
Microstructures 2023;3:2023015. DOI: 10.20517/microstructures.2022.40AbstractEutectic high-entropy alloys (EHEAs) have drawn increasing interest due to their fine castability as well ... MOREEutectic high-entropy alloys (EHEAs) have drawn increasing interest due to their fine castability as well as appealing properties in recent years. In this work, two bulk-casting Co20-x/3Cr20-x/3Ni50-x/3Al10+x (x = 8 and 9) EHEAs with regular L12/B2 lamellar morphologies were successfully fabricated and studied. Both EHEAs show high ultimate strength of ~1200 MPa combined with good uniform ductility (> 9%). Post-deformation transmission electron microscopy results indicated a high density of dislocations and stacking faults in the L12 lamellae, while no obvious dislocation in the B2 phases. This work can broaden the optimization of composition design in EHEAs and provide useful guidance for further development of CoCrNiAl EHEAs. LESS Full articleResearch Article|Published on: 27 Feb 2023 -
The effect of chromium content on the corrosion behavior of ultrafine-grained CrxMnFeCoNi high-entropy alloys in sulfuric acid solution
Microstructures 2023;3:2023014. DOI: 10.20517/microstructures.2022.36AbstractChromium (Cr) plays a critical role in the corrosion resistance of conventional alloys via the ... MOREChromium (Cr) plays a critical role in the corrosion resistance of conventional alloys via the formation of a dense Cr oxide-based passive film. However, the exact role of Cr in the corrosion of high-entropy alloys (HEAs) remains unclear. The effect of Cr content on the corrosion behavior of the ultrafine-grained CrxMnFeCoNi (x = 0, 0.6, 1, and 1.5) HEAs in the sulfuric acid solution (0.5 M H2SO4) was investigated. These HEAs were fabricated using a combination of mechanical alloying and spark plasma sintering. The electrochemical tests show that the passive film was more compact and thicker at higher Cr concentration, but the corrosion rate first increased and then decreased, due to the presence of the nanocrystalline-amorphous phase boundaries in the passive film. Long-time immersion tests show that the corrosion rate increased exponentially with the Cr content, due to the gradual accumulation of the galvanic corrosion. LESS Full articleResearch Article|Published on: 22 Feb 2023 -
Recent progress on alloy-based anode materials for potassium-ion batteries
Microstructures 2023;3:2023013. DOI: 10.20517/microstructures.2022.30AbstractPotassium-ion batteries (PIBs) are considered as promising alternatives to lithium-ion batteries due to the abundant ... MOREPotassium-ion batteries (PIBs) are considered as promising alternatives to lithium-ion batteries due to the abundant potassium resources in the Earth’s crust. Establishing high-performance anode materials for PIBs is essential to the development of PIBs. Recently, significant research effort has been devoted to developing novel anode materials for PIBs. Alloy-based anode materials that undergo alloying reactions and feature combined conversion and alloying reactions are attractive candidates due to their high theoretical capacities. In this review, the current understanding of the mechanisms of alloy-based anode materials for PIBs is presented. The modification strategies and recent research progress of alloy-based anodes and their composites for potassium storage are summarized and discussed. The corresponding challenges and future perspectives of these materials are also proposed. LESS Full articleReview|Published on: 22 Feb 2023
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About The Journal
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ISSN
2770-2995 (Online)
Publisher
OAE Publishing Inc.
Article Processing Charges
$1200
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Editor-in-Chief
Shujun Zhang
Publishing Model
Gold Open Access
Copyright
Copyright is retained by author(s)
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Publication Frequency
Quarterly
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Total publications: 46
Total article views: 55,727
Total article downloads: 17,565
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