Related references
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K. A. Kuptsov et al.
Summary: Thick, dense, and uniform Fe-Cr-Ni-Co-(Cu) coatings with a crack-free surface have been successfully deposited on AISI 420S steel by vacuum electro-spark deposition using CrNiCo and CrNiCoCu electrodes. The coatings consist of columnar grains and subgrains of an fcc phase and spherical inclusions of mixed SiO2 + (Cr,Ti)2O3 oxide. Cu does not form its own phase and is in the metal solid solution. FeCrNiCo coatings exhibited enhanced corrosion resistance in seawater and displayed improved tribocorrosion performance due to faster recovery of a passive film. The addition of Cu improved the antibacterial activity of the coatings against Gram-positive bacteria.
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(2023)
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Hongcai Xie et al.
Summary: Investigating the shock-induced phase transition in equiatomic FeNiCrCoCu HEA, this study reveals that the transition is more likely to occur along specific crystallographic directions and at certain shock velocities. With an increase in shock velocity, a shift in deformation mechanism from dislocation-dominated to phase-transition-dominated is observed, contributing to the weakening of shock wave and damage attenuation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
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Engineering, Mechanical
Shangwei Song et al.
Summary: In this study, molecular dynamics simulation was used to investigate the plastic response of CoCrFeNiMn high entropy alloys (HEAs) under shock loading, with the concentration of Mn element as the variable. The results show that the unique physical shock properties are related to the anomaly arrangement of Mn elements. Compared to the uniform distribution, the gradient distribution of Mn leads to lattice mismatch and increases the energy barriers of dislocation mediated slip, resulting in anomalous shock strength. Moreover, the gradient distribution of Mn significantly reduces the efficiency of shock energy conversion due to dislocation activity and crystal phase changes caused by lattice mismatch.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
I. A. Bryukhanov
Summary: In molecular dynamics simulations of shock compression and spall fracture in [111] copper single crystals with pre-existing dislocations, it is found that the increase in dislocation density behind the shock wave is quadratic and independent of the initial dislocation density. Pre-existing dislocations almost do not affect the spall strength but significantly slow down the spall process, resulting in a more ductile fracture.
INTERNATIONAL JOURNAL OF PLASTICITY
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Review
Materials Science, Multidisciplinary
B. Y. Li et al.
Summary: Amorphization of crystalline structures is a common phenomenon in metals, ceramics, and intermetallic compounds, and can be achieved through mechanical deformation. This review focuses on the methods and experimental observations of amorphization induced by mechanical deformation, as well as the mechanisms of plastic deformation and computational simulations.
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Mianzhen Mo et al.
Summary: This article presents the visualization of the three-dimensional response of single-crystal aluminum to ultrafast laser-induced compression using femtosecond MeV electron diffraction measurements. The results show that the lattice transitions from a purely elastic state to a plastically relaxed state within 5 ps after reaching an elastic limit of about 25 GPa. Large-scale molecular dynamics simulations agree well with the experimental results and provide an atomic-level description of dislocation-mediated plasticity.
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Kun Jiang et al.
Summary: This study investigates the mechanical responses and microscopic observations of a face-centered cubic high entropy alloy under different loading conditions. The results reveal a transition of plasticity mechanisms as the strain increases, including twinning, detwinning-induced localization, nanoscale phase transformation, and amorphization. The hindrance of twin boundaries to localized band propagation and the emission of more dislocations from body-centered cubic phases result in a second rise in hardening. The plasticity increases during the crystal to amorphization transition, possibly due to severe lattice distortion in areas with super-dense dislocations. Molecular dynamic simulations provide a deeper understanding of the phase transition mechanisms.
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L. Ding et al.
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Summary: This article investigates the dynamic and structural response of h-BN reinforced PE nanocomposites under shock loading, revealing the importance of fabrication techniques and BNNP concentration in impacting the impact strength and plastic deformation mechanisms. Additionally, molecular dynamics simulations show that the orientation and distribution of BNNS play a crucial role in shock mitigation capabilities.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
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Long Guo et al.
Summary: Tungsten is a promising candidate material for future fusion reactors. The study finds that the habit plane and plasticity of tungsten with a 1/2 < 111 > crystallographic orientation are strongly influenced by shock waves. A new rotation mechanism is proposed to predict the changing trend of the habit plane of dislocation loops.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
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Materials Science, Multidisciplinary
N. B. Zhang et al.
Summary: In this study, the shock compression and spallation damage behavior of a high-entropy alloy, Al 0.1 CoCrFeNi, were investigated. The equation of state and spall strength of the alloy were determined at different impact strengths. A power-law relation between spall strength and strain rate was observed. The spall strength of Al 0.1 CoCrFeNi HEA was found to be higher than previously studied HEAs and comparable to widely applied structural stainless steels. Dislocation glide and stacking faults were identified as the important deformation mechanisms in the alloy. Additionally, nanotwins were observed only at high shock stress.
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(2022)
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Jingyang Zhang et al.
Summary: This study successfully synthesized strong and ductile cermet nanosheets through the reaction between high entropy alloy nanocrystals and poly-vinyl alcohol, overcoming the brittleness issue faced by conventional cermets.
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Materials Science, Multidisciplinary
Long Zhao et al.
Summary: Recent studies have shown unusual dislocation core structure and motion in complex concentrated alloys. This study investigates the dislocation structure behind a shock-wave front in bcc high-entropy alloys, revealing an anomalous 'extended' edge dislocation structure that can facilitate faster dislocation motion and deter the early nucleation of deformation twins. The unique dislocation structures are attributed to nanoscale chemical heterogeneities in high-entropy alloys.
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Materials Science, Multidisciplinary
Saro San et al.
Summary: A comparative study of high entropy alloys using ab initio calculations reveals intricate interdependence among electronic structure, interatomic bonding, partial charge distribution, and mechanical properties. The novel parameter of total bond order density (TBOD) is used to interpret the properties, with highest TBOD found in Cantor alloy NiFeCoCrMn. Experimental validation shows lattice distortions in NiFeCoCrMn and NiFeCoCrPd based on atomic radii variations. Modeling of Cu and Pd clustering in the supercell demonstrates lower total energy, consistent with observed enhancements in Cu and Pd-induced concentration wave in HEAs.
MATERIALS & DESIGN
(2021)
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Zhou-Can Xie et al.
Summary: Hydrogen embrittlement in high entropy alloys (HEAs) was studied using a specially designed double-target technique, revealing the phenomenon of hydrogen-retarded spallation. A trans-scale statistical damage mechanics model was developed to explain the mechanism, attributing it to hydrogen-vacancy complexes and nano-twins. These results provide insights for a better understanding of hydrogen embrittlement in chemically complex HEAs.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
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Qian Zhang et al.
Summary: Limited studies have been conducted on plastic deformation mechanisms in single-crystalline high-entropy alloys with body-centered cubic phases. Experimental results have shown significant size effects on yield/flow stress and remarkable strain hardening in these HEA micropillars/nanopillars, especially those with<100> orientation. Dislocation slip, reaction, tangling, accumulation, and solid solution effects contribute to the observed size effects on yield/flow stress and strain hardening, but these mechanisms depend on nanopillar orientation.
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K. Katagiri et al.
Summary: The study found that liquid tantalum under several hundred gigapascals of pressure exhibited negative pressure, leading to a mixing state of liquid tantalum and gas. These results provided direct evidence for the classical nucleation theory predicting that liquids with high surface tension can support tensile stress in the gigapascal regime.
PHYSICAL REVIEW LETTERS
(2021)
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Hao Wang et al.
Summary: In situ straining transmission electron microscopy experiments on the Cantor high-entropy alloy (HEA) of CrMnFeCoNi demonstrate a crystalline-to-amorphous phase transformation in ultrafine-grained microstructures. The increase of crack-tip dislocation densities due to high lattice friction and grain boundary resistance triggers the transformation. The formation of amorphous nanobridges in the crack wake dissipates strain energies, providing effective toughening mechanisms for HEAs.
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Yujie Chen et al.
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Javier Varillas et al.
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O. R. Deluigi et al.
Summary: Research has shown that high entropy alloys exhibit a lower average number of defects in the early stages of radiation damage response compared to pure Ni, but there is no significant difference in defect evolution during the cascade, indicating that the radiation resistance of high entropy alloys may not be due to a reduction in primary damage caused by chemical disorder, but probably caused by longer-time defect evolution.
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Materials Science, Multidisciplinary
Yan Ma et al.
Summary: Deformation-induced hcp nano-lamellae were observed in the CoCrNi medium-entropy alloy under high strain rate and cryogenic temperature, leading to higher hardness compared to room temperature-deformed samples. Molecular dynamics simulations revealed that both phase strengthening and extra interface strengthening contribute to the overall strengthening, with the interface strengthening always stronger. Samples with smaller interspacing of hcp nano-lamellae showed higher strength due to increased density of phase boundaries and newly formed twin boundaries.
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Mulaine Shih et al.
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NATURE COMMUNICATIONS
(2021)
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Multidisciplinary Sciences
Sheng Yin et al.
Summary: The presence of short-range order influences the mobility of dislocations in high-entropy alloys, with edge dislocations being enhanced and double-kink nucleation in screw dislocations being reduced. A cross-slip locking mechanism is observed for the motion of screws, providing extra strengthening for refractory high-entropy alloy system.
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(2021)
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Multidisciplinary Sciences
Shiteng Zhao et al.
Summary: High-entropy alloys (HEAs) show remarkable material properties under harsh conditions, with structures containing stacking faults, twins, transformation between crystal structures, and amorphization being generated through plastic deformation processes.
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