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Article
Materials Science, Multidisciplinary
Weiqi Tang et al.
Summary: A novel high-entropy alloy with hierarchical microstructure and high strength was fabricated and investigated. The mechanical properties of the alloy were tested at different strain rates, exhibiting excellent ductility and high ultimate strength. Metal combustion phenomenon was observed during dynamic deformation, and the addition of tungsten was found to promote combustion. Furthermore, the alloy demonstrated an excellent ability to deliver lateral damage compared to other materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hang Zhang et al.
Summary: In this paper, three kinds of refractory high entropy alloys, M0, M10 and M20, were designed and formed by Laser powder bed melting (LPBF) technology. The effect of Mo content on the microstructure and mechanical properties of the three alloys was studied. The results showed that with the increase of Mo element content, the grain size of the alloy becomes smaller, the yield strength increases greatly, and the plasticity of the alloy decreases continuously. This research solves the matching problem between plasticity and strength of refractory high entropy alloys at room temperature, providing a foundation for their industrial application.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
H. T. He et al.
Summary: A novel Re0.1Hf0.25NbTaW0.4C0.25 high-entropy alloy with both high-temperature strength and room-temperature ductility was reported. The microstructure of the alloy consisted of BCC matrix phase and eutectic phases, with dispersed secondary carbides precipitated in the BCC matrix. The alloy showed excellent compressive strength at high temperatures and a good compressive fracture strain at room temperature, indicating its potential applications in ultra-high temperature structural materials.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Qingwei Guo et al.
Summary: This study investigates the structural transformation and strain localization of Al0.3CoCrFeNi high-entropy alloy during nanoindentation using molecular dynamics, and discusses the hardening-softening mechanism. The simulations reveal the discovery of a prismatic dislocation loop with independent nucleation in the [111] orientation for the first time. Dislocation multiplication and cross-slip lead to work hardening, while free dislocation slip and annihilation cause plastic softening. Twin boundaries contribute to hardening but can also cause softening effects in the later stage of plastic deformation due to the formation of steps and local damage zones.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Ruyang Han et al.
Summary: This study conducted low-temperature hot rolling on air-cooled medium manganese martensitic steel, using a significantly lower finishing rolling temperature (FRT) than conventional temperature. The effects of FRT on microstructure, mechanical properties, and wear resistance were investigated. The results showed that low-temperature hot rolling resulted in a refined martensite microstructure, increased dislocation and grain boundary densities, and promoted nano-scaled V(C, N) precipitation. This led to enhanced strengthening and improved wear resistance.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Wei Jiang et al.
Summary: Hypereutectic high-entropy alloys, such as Al1.1CoCrFeNi2.1, exhibit superior mechanical properties, including high strength and ductility. At low temperatures, the alloy demonstrates the highest ultimate tensile strength and excellent elongation, while at high temperatures, it shows increased plasticity.
Article
Chemistry, Physical
Weici Zhuang et al.
Summary: By conducting hot rolling with a 40% deformation at 500 degrees C, the microstructure of (Ti3AlC2-Al3Ti)/2024Al composites was improved, resulting in increased strength and ductility. The rolling deformation refined the precipitations in the matrix, elongated the network structure, and activated the DRX behavior, leading to grain refinement and sub-grain appearance. The as-rolled composites exhibited significant enhancement in both ultimate tensile strength (38%) and elongation (nearly 1 time), with superior strengthening mechanisms attributed to grain refinement, load transfer of reinforcements, and thermal mismatch.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Wei Yang et al.
Summary: Novel high-entropy alloys (HEAs) with excellent mechanical properties and biocompatibility have been designed and synthesized for biomedical applications, demonstrating great potential in the field.
Article
Materials Science, Multidisciplinary
Xujie Gao et al.
Summary: By adding metallic and non-metallic elements to Hf-Mo-Nb-Ti-Zr alloys, multiphase reinforced refractory high entropy alloys can be formed, and the type and content of the newly formed phases are closely related to the mixing enthalpy between alloying elements and the constituent elements of the matrix alloy.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tao Xiang et al.
Summary: The contradiction between the strength and ductility of metallic materials has been a long-term scientific problem. Dual-phase equiatomic and non-equiatomic Ti-Zr-Nb-Ta high-entropy alloys (HEAs) with super-high strength and excellent ductility have been successfully developed. The strength of the equiatomic HEAs is attributed to the ultra-fine grain size, and they have potential applications as advanced biomaterials in the medical field.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Z. Q. Xu et al.
Summary: By alloying Si with TiVNbTa and conducting hot rolling process, the TiVNbTaSi0.1 alloy shows exceptional high-temperature oxidation resistance and mechanical properties, highlighting its great potential for applications in high-temperature environments.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
N. K. Sarkar et al.
Summary: A new high entropy alloy with chemical disorder and highly distorted lattice structure shows superconducting behavior. The alloy has a dendritic morphology and incomplete partition of constituent elements. Superconductivity measurements indicate that it is a moderately coupled type-II superconductor.
Article
Chemistry, Physical
Yuwei Yan et al.
Summary: The FeCoNi1.5CrCu/2024Al composites fabricated by microwave sintering were hot rolled to study the effects of hot rolling reduction on microstructure, mechanical properties, and macroscopic crystal structure. The results showed that a reduction of 62.5% led to significant refinement of reinforced particle clusters and disappearance of large-size clusters. The distribution of reinforced particles in the matrix was homogeneous along the rolling direction, and the grain size of the matrix was significantly reduced. The relative density and microhardness of the composites increased first and then decreased with increasing reduction, reaching a maximum of 96.6% and 172.5 HV at 62.5%, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xuehui Yan et al.
Summary: Extraordinary strength and good tensile ductility are achieved in (Zr0.5Ti0.35Nb0.15)(100-x)Al-x alloys at room temperature. The relatively low densities exhibited in these alloys make them attractive structural materials. Designing nanoprecipitates and diversifying dislocation motions play key roles in achieving such breakthrough.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Zhe Liu et al.
Summary: The feasibility of thermomechanical processing for large-size AlCoCrFeNi2.1 eutectic high-entropy alloy has been evaluated. It is found that hot-rolling can achieve outstanding tensile properties comparable to cold-rolling, while cold-rolling and warm-rolling are not effective in deforming large-size AlCoCrFeNi2.1.
Article
Chemistry, Physical
Shutian Tao et al.
Summary: This study investigates the synthesis of a novel alloy by introducing carbon element to a refractory high entropy alloy. The results demonstrate that the addition of carbon changes the phase identification, microstructure evolution, and mechanical properties of the alloy. With increasing carbon content, the alloy exhibits higher strength and a change in fracture mechanism.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Beibei Wei et al.
Summary: The effect of rolling process on the microstructure and mechanical properties of TNM alloy sheets was investigated. The microstructure transformed from lamellar to duplex structure as the rolling reduction increased. A novel Z-type lamellar structure was formed at 67.5% deformation strain. The βo phase decomposed and transformed to α2+γ phases with increased reduction.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Weijie Zheng et al.
Summary: Due to their solid solution structure, high-entropy alloys exhibit high strength and resistance to softening at both high and ambient temperatures. However, their high density and low plasticity at ambient temperature limit their widespread applications. This study investigated the microstructure and mechanical properties of MoNbVTx HEA with different Ta contents and found that certain alloys exhibited superior high temperature performance and relatively low density, making them potential materials for structural applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Wei Jiang et al.
Summary: The effects of fabrication and treatment processes on the microstructure and mechanical properties of a high-Zn-content lightweight medium-entropy alloy were systematically studied. The results show that the alloy exhibits improved strength after hot rolling, solid solution treatment, and ageing treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Industrial
Chunyuan Cui et al.
Summary: In this study, machine learning models were developed to predict the softening kinetics and rolling forces during hot rolling. The behavior of recrystallization and grain size evolution were also analyzed, and the results were consistent with experimental findings.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Review
Materials Science, Multidisciplinary
Weidong Li et al.
Summary: Research in high-entropy alloys has been booming since the 2010s, focusing on the vast potential in compositions, microstructures, and properties. Efforts are mainly directed towards exploring the compositional space and microstructures, as well as understanding the mechanical behavior. However, there is still a lack of comprehensive studies on the mechanical behavior of high-entropy alloys.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Tsai-Fu Chung et al.
Summary: The Mn-free Fe27Co24Ni23Cr26 high-entropy alloy underwent ballistic deformation at room temperature, revealing different microstructural features in various regions, including lamellar annealing nanotwins, complex nanotwin structures, high density of dislocations, and stacking faults. These structures play a crucial role in restricting dislocation movement in the alloy.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yuuka Iijima et al.
Summary: By applying empirical alloy parameters and thermodynamic calculations, new noble nonequiatomic Ti-Zr-Hf-Nb-Ta-Mo high-entropy alloys for metallic biomaterials were designed. The Mo equivalent and valence electron concentration parameters were found to be useful for alloy design, including BCC structure formation in bio medium-entropy alloys and BioHEAs.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Rajeshwar R. Eleti et al.
Summary: Investigated the plastic deformation and rate-controlling mechanism during tensile deformation of various body-centered cubic (BCC) medium/high-entropy alloys (MEAs/HEAs) at 300 K, revealing screw dislocation motion overcoming the Peierls-Nabarro stress barrier as the rate-controlling mechanism, with the activation volume (V*) found inversely proportional to the yield strength.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Multidisciplinary
Zibing An et al.
Summary: A new strategy is demonstrated to achieve ductile BCC HfNbTiV by decomposing the BCC arrangement into two different phases via spinodal decomposition, resulting in chemical composition modulations and elastic strain on a length scale of a few tens of nanometers. The periodically spaced beta* with large lattice distortion is particularly effective in hindering dislocation movement, leading to strain hardening and enhancing plastic strain delocalization, ultimately achieving high yield strength and tensile strain to failure.
MATERIALS HORIZONS
(2021)
Article
Chemistry, Physical
Qinqin Wei et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Nanoscience & Nanotechnology
Igor Moravcik et al.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
Wei Jiang et al.
MATERIALS & DESIGN
(2020)
Article
Chemistry, Physical
Chun-Hsiang Tu et al.
Article
Nanoscience & Nanotechnology
Takao Hori et al.
SCRIPTA MATERIALIA
(2019)
Article
Nanoscience & Nanotechnology
S. Y. Chen et al.
SCRIPTA MATERIALIA
(2019)
Article
Materials Science, Multidisciplinary
Margaret Wu et al.
MATERIALS CHARACTERIZATION
(2019)
Article
Materials Science, Multidisciplinary
D. J. M. King et al.
Article
Chemistry, Physical
Takeshi Nagase et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Chemistry, Physical
Yiwen Chen et al.
Article
Chemistry, Physical
J. Cizek et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Materials Science, Multidisciplinary
Wei Jiang et al.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2018)
Article
Chemistry, Physical
N. N. Guo et al.
Article
Materials Science, Multidisciplinary
N. D. Stepanov et al.
Article
Chemistry, Physical
O. N. Senkov et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2011)
