Article
Materials Science, Multidisciplinary
Abhishek Mehta, Yongho Sohn
Summary: Experimental measurements of chemical and tracer diffusion coefficients in Al0.25CoCrFeNi high-entropy alloy suggest that diffusion may not necessarily be sluggish, indicating a more complex diffusion behavior in high-entropy alloys than previously thought.
MATERIALS RESEARCH LETTERS
(2021)
Article
Nanoscience & Nanotechnology
N. N. Liang, R. R. Xu, G. Z. Wu, X. Z. Gao, Y. H. Zhao
Summary: A nanocrystalline high-entropy alloy was produced by high pressure torsion, and the evolution of microhardness and microstructure during subsequent isochronal annealing was studied. The alloy exhibited nano-grains and deformation nano twin lamella, which contributed to its hardness. Annealing below 600°C induced hardening without precipitation effect, while annealing above 600°C resulted in evident recrystallization and grain growth. The high thermal stability of the alloy was attributed to kinetic sluggish diffusion effect and deformation twin boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Zachary T. Kloenne, Jean-Philippe Couzinie, Milan Heczko, Roman Groger, Gopal B. Viswanathan, William A. T. Clark, Hamish L. Fraser
Summary: A refined microstructure consisting of bcc precipitates embedded in an ordered B2 matrix has been observed in the refractory high entropy alloy AlMo0.5NbTa0.5TiZr, resembling an inverted superalloy-like micro-structure. Coarsening of the microstructure occurs after aging, resulting in a faceted interface. Misfit dislocations at the interface were observed on the {110} interface plane, extending into the bcc phase, and no lattice invariant deformation normal to the primary {110} planes was observed, indicating a pure expansion transformation between the B2 and bcc phases.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Hongyang Li, Weiming Yang, Yan Ma, Fanli Kong, Yixing Wan, Changjiu Chen, Haishun Liu, Hui Li, Akihisa Inoue
Summary: In recent years, (Ti, Zr, Hf)(Co, Ni, Cu) high entropy alloys (HEAs) have attracted widespread attention due to their excellent properties such as high-temperature shape memory property and high yield strength. However, their application has been limited by the lack of plastic deformability. In this study, a new HEA with good mechanical properties was successfully synthesized by controlling the formation ability of metastable amorphous and B2 phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Hongchao Li, Jun Wang, Haoxue Yang, Mengmeng Zhao, William Yi Wang, Ruihao Yuan, Jinshan Li
Summary: This study investigated the effect of thermomechanical treatments on the mechanical properties of high-entropy alloy Al0.5CoCrFeNi. The results showed that the nanoscale B2 phases formed through aging significantly enhanced the strength of the alloy, and pre-deformation facilitated the formation of B2 phases and further improved the strength of the alloy.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Zhoucan Xie, Yunjiang Wang, Chunsheng Lu, Lanhong Dai
Summary: This study investigates the solution and diffusion of hydrogen in high entropy alloys (HEAs) and its effects on stacking fault energy through first-principles calculations. The unique lattice distortion in HEAs leads to a wide distribution of local hydrogen solution energy and trapping of hydrogen in low energy sites, increasing diffusion barriers. Additionally, hydrogen reduces unstable and stable stacking fault energies, promoting the formation of deformation twins.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Dongming Jin, Zhenhua Wang, Junhao Yuan, Beibei Jiang, Fengyun Yu, Jinfeng Li, Qing Wang
Summary: The present work developed a novel high-strength and energetic high entropy alloy with a BCC/B2 coherent microstructure. This alloy exhibits excellent thermal stability and mechanical properties, showing great potential as high-performance energetic structural materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xin Fan, Shujing Zheng, Siming Ren, Jibin Pu, Keke Chang
Summary: High-entropy alloy films prepared by magnetron sputtering, particularly amorphous VAlTiCrSi films, exhibit good thermal stability and high-temperature tribological properties, with structural changes at elevated temperatures playing a crucial role in improving friction properties.
MATERIALS CHARACTERIZATION
(2022)
Article
Multidisciplinary Sciences
Hao Wang, Dengke Chen, Xianghai An, Yin Zhang, Shijie Sun, Yanzhong Tian, Zhefeng Zhang, Anguo Wang, Jinqiao Liu, Min Song, Simon P. Ringer, Ting Zhu, Xiaozhou Liao
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.
Article
Nanoscience & Nanotechnology
Sandipan Sen, Xi Zhang, Lukasz Rogal, Gerhard Wilde, Blazej Grabowski, Sergiy V. Divinski
Summary: The self-diffusion of Ti in multi-principal element alloys HfTiZr and AlScHfTiZr is measured using the radio-tracer technique and 44Ti isotope. There are no deviations from linear Arrhenius temperature dependencies observed from 973 K to 1373 K. Alloying equiatomic HfTiZr with Al and Sc enhances Ti diffusion rates, and this effect becomes more pronounced with increasing Al content. The Ti diffusivities in the multi-principal element alloys exceed the values predicted by a simple geometric mean of the Ti diffusion coefficients in the pure metals by orders of magnitude, which is referred to as 'anti-sluggish' diffusion. Lattice distortions are speculated to be the dominant factor in the relative enhancement of Ti diffusion in these HCP high-entropy alloys, leading to the 'anti-sluggish' behavior. The experimental findings are supported by ab initio-derived mean squared atomic displacements and potential energy fluctuations in these alloys.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
N. Yurchenko, E. Panina, A. Belyakov, G. Salishchev, S. Zherebtsov, N. Stepanov
Summary: High-entropy intermetallics show great potential for high-temperature applications, but there is limited information on their plastic flow behavior and deformation mechanisms. A yield strength anomaly was observed in a refractory AlNbTiVZr0.25 high-entropy alloy during compression tests, possibly connected to the glide of dissociated a (111) superdislocations.
Article
Chemistry, Physical
Guo Pu, Sen Sun, Sishu Wang, Lin Gan, Sheng Chen, Zongbiao Ye, Zhangyi Huang, Jiaochun Zheng, Zhijun Wang, Chi Yang, Liwei Lin, Bo Liu, Kun Zhang, Yihan Wang
Summary: In this study, tungsten films and tungsten-containing TaTiWVCr refractory high entropy alloy (RHEA) were irradiated by a helium ion beam platform. The results showed that the RHEA amorphous films were more prone to crystallization and grain growth compared to the tungsten films. Additionally, the RHEA exhibited better swelling resistance than tungsten.
Article
Materials Science, Multidisciplinary
Kai Chong, Yu Gao, Zhibin Zhang, Yong Zou, Xiubing Liang
Summary: The present study has designed and prepared a novel Zr22.5Ti22.5Hf22.5Ni22.5Ta10 high-entropy amorphous alloy with excellent thermal stability and corrosion resistance. The hysteresis diffusion effect caused by the high mixing entropy of the multi-principal system affects the formation of the crystalline phase and improves thermal stability. The alloy exhibits excellent corrosion resistance compared to 316 L in 3.5 wt% NaCl solution. The XPS results indicate that the passive film of Zr22.5Ti22.5Hf22.5Ni22.5Ta10 is rich in oxides of Zr, Ti, Hf, and Ta, which provides excellent resistance to chloride ion attack.
Article
Chemistry, Physical
Z. J. Shi, Z. B. Wang, X. D. Wang, S. Zhang, Y. G. Zheng
Summary: The corrosion resistance of Al-Co-Cr-Fe-Ni high entropy alloys (HEAs) is affected by B2 phases, which lead to easier pit initiation and propagation, as evidenced by microstructure characterization and electrochemical measurements. The detrimental effect of B2 phases on the corrosion resistance of Al0.3CoCrFeNi HEAs is confirmed in this study.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Z. Q. Zhang, S. Ketov, S. Fellner, H. P. Sheng, C. Mitterer, K. K. Song, C. Gammer, J. Eckert
Summary: Diffusion plays a significant role in phase formation and transformation in solid-state alloys. In a high-entropy alloy (HEA), the influence of element diffusion on phase formation and transition behavior was systematically studied. The thermodynamic effect governs the evolution of major phases, while the diffusion direction is controlled by the Gibbs free energy gradient. The sluggish diffusion effect is not dominant during reactive diffusion.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
J. Pan, Yu. P. Ivanov, W. H. Zhou, Y. Li, A. L. Greer
Article
Materials Science, Multidisciplinary
Yan Lin, Qin Yu, Jie Pan, Fenghui Duan, Robert O. Ritchie, Yi Li
Article
Chemistry, Physical
F. X. Bai, S. J. Zheng, Y. X. Wang, J. Pan, J. H. Yao, Y. Li
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Chemistry, Physical
Xiao-Yi Cuan, Yan Lin, Jie Pan, Dong-Ming Sun, Yi Li
Summary: The use of nacre-like structure in materials synthesis has yielded notable successes in creating novel structural composites, but few practical advances have been made in metals. In this study, a complex hierarchical microstructure, the brick-and-mortar structure, was successfully architected in metal/metal hybrids using lithographic method and electrodeposition technique, allowing accurate control of material composition and enhanced fracture toughness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Weihua Zhou, Yonghua Meng, Fenghui Duan, Wei Huang, Jiahao Yao, Jie Pan, Yinxiao Wang, Yi Li
Summary: The study found that the formation of the tau(3) phase (Zr50Cu29Ni2Al19 intermetallics) is triggered when the oxygen level reaches 350 ppm, with oxygen mainly concentrated in this phase. Additionally, the lattice parameter of the tau(3) phase increases with the oxygen content.
Article
Materials Science, Multidisciplinary
F. H. Duan, Y. Naunheim, C. A. Schuh, Y. Li
Summary: The study investigates the hardness and deformation behavior of body centered cubic Mo(O) alloys with grain sizes ranging from 120 to 4 nm, highlighting a peak hardness at 11 nm and a transition towards glass-like deformation behaviors as grain size decreases.
Article
Materials Science, Multidisciplinary
W. H. Zhou, F. H. Duan, Y. H. Meng, C. C. Zheng, H. M. Chen, A. G. Huang, Y. X. Wang, Y. Li
Summary: The study systematically investigated the evolution of microstructure and mechanical properties of Zr-based bulk metallic glasses with varying oxygen content. Results showed that with increasing oxygen content, compressive plasticity decreased slightly before plunging drastically, revealing a threshold oxygen content level for ductile-brittle transition at 3500 at. ppm. The embrittlement at high oxygen content was closely related to changes in microstructure.
Article
Materials Science, Multidisciplinary
Yunli Lu, Fenghui Duan, Jie Pan, Yi Li
Summary: Research on thermal stability of nanocrystalline metals reveals a high-throughput experimental strategy to rapidly determine the critical size of grain growth, which was found to be similar in gradient structured Ni and homogeneous structured Ni. The critical size was independent of the gradient structure, demonstrating a potential high-throughput strategy for exploring the size-dependent thermal stability of metals.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Fenghui Duan, Yan Lin, Jie Pan, Lei Zhao, Qiang Guo, Di Zhang, Yi Li
Summary: This study reports continuous strengthening in nanotwinned pure Ni with an unprecedented strength of 4.0 GPa achieved at an extremely fine twin thickness of 2.9 nm. The results highlight the important role of secondary nanotwins in sustaining plastic deformation and contribute to the overall high strength of the material.
Article
Materials Science, Multidisciplinary
J. Jiang, Z. B. Wang, S. J. Pang, Y. G. Zheng, Y. Li
Summary: The study reveals that oxygen impurities can improve pitting corrosion resistance in as-cast Zr61Ti2Cu25Al12 bulk metallic glasses when present at lower levels, but can worsen corrosion behavior at higher concentrations. This highlights the significant impact of oxygen impurities on the corrosion behavior of the material.
Article
Nanoscience & Nanotechnology
Yan Lin, Fenghui Duan, Jie Pan, Cheng Zhang, Qi Chen, Junyong Lu, Lin Liu
Summary: A gradient structure transitioning from coarse-grained Ni to nanocrystalline/amorphous Ni-P alloy has been designed to improve adhesion performance of electrodeposited Ni-P coatings. The gradient-structured Ni-P coatings on CuCrZr alloy substrate exhibit significantly higher interface shear strength and bending strength, which are increased by 90% and 60% respectively compared to conventional monolithic-structured Ni-P coatings.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Li-Xue Liu, Jie Pan, Cheng Zhang, Jing-Yu Xu, Rong Guo, Lin Liu
Summary: This study reveals the preparation of a high entropy alloy with complex geometry and superior mechanical properties through selective laser melting. The rapid solidification rate during the process induces a hierarchical structure, contributing to excellent mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiaoyi Cuan, Yan Lin, Zehui Liu, Bo Zhang, Ning Li, Jie Pan
Summary: The impact toughness of A/C Ni-P/Ni laminates is significantly influenced by the thickness of the amorphous Ni-P layer, with thin layers exhibiting high impact energy and thick layers being more susceptible to impact damage.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Pan Jie, Duan Fenghui
Summary: Metallic glasses are a subject of interest in condensed physics and materials science due to their unique structure and properties. Rejuvenation is a process that transforms the material back to a higher-energy state, significantly expanding the energy range and improving deformation capability.
ACTA METALLURGICA SINICA
(2021)
Article
Chemistry, Physical
M. H. Abbasi, R. Tavakoli, S. G. Shabestari
Summary: The correlation between atomic-scale structure and glass-forming ability of ternary bulk metallic glasses was investigated using molecular dynamics simulation. It was found that the potential energy of the icosahedra reflects the geometric ordering, while the virial stress energy density reveals the chemical ordering. Based on this discovery, a new prediction criterion for glass-forming ability was proposed and validated using experimental data.
Article
Chemistry, Physical
Haimin Zhai, Shuai Cui, Sheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Wensheng Li, Zhornik Viktor, Uladzimir Seniuts
Summary: Laser shock peening (LSP) treatment significantly affects the phase structure and properties of titanium-based BMG materials, promoting rejuvenation and introducing heterogeneity. This leads to improved plasticity and resistance to crack propagation. LSP-1 specimen exhibits higher hardness and plasticity, reducing fatigue peeling wear caused by brittleness. However, excessive LSP results in increased susceptibility to pitting and significantly reduces tribocorrosion resistance.
Article
Chemistry, Physical
Olga A. Blatova, Maria A. Solodovnikova, Ekaterina M. Egorova, Vladislav A. Blatov
Summary: This study applied a universal geometrical-topological approach to analyze the crystal structures of intermetallic compounds deposited in the Inorganic Crystal Structure Database. By exploring the local atomic configurations, they identified different types of coordination polyhedra and proposed criteria for determining geometric instability. This research provides useful indicators for checking crystallographic information and validating structural models.
Article
Chemistry, Physical
Jose M. Torralba, Diego Iriarte, Damien Tourret, Alberto Meza
Summary: The amount of globally recycled e-waste is less than 20% of the total produced. One of the causes for this low recycling rate is the complex and expensive selective sorting of metals. However, recent research has shown that high entropy alloys (HEAs) can be made from complex alloy mixtures, reducing the dependence on pure critical metals. It has been demonstrated that e-waste can be used to produce competitive HEAs.
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, W. Y. Xue, J. P. Li
Summary: This study successfully improved the mechanical properties of high-entropy alloys (HEAs) through phase decomposition modulation, achieving strengthening of low-cost CuFeMnNi HEAs. The annealed HEAs exhibited excellent mechanical properties, with significantly increased yield strength and maintained satisfactory elongation.
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, F. R. Pratama
Summary: In this study, the growth rate of a crystalline phase in the Al-Fe-Mn-Si metallic glass was measured in real time using transmission electron microscopy. The effective diffusion coefficient related to the slowest diffusing element (Mn) was estimated. The results showed that the growth rate of the crystalline phase was significantly faster compared to pure Al and AlFe compound.
Article
Chemistry, Physical
Zhenhua Han, Yubo Tian, Jun Yang, Jianzhao Li, Jinyang Zhang, Gang Liu, Ran Wei, Guojun Zhang
Summary: In this study, a novel medium-entropy alloy (MEA) (Fe65Ni15Cr10Co10)92Ti5Al3 with a dual heterogeneous structure was developed by adding Ti and Al to a previously reported Fe65Ni15Co10Cr10 MEA. The MEA exhibited ultra-high ultimate tensile strength and work hardening extent at room temperature. The addition of Ti and Al induced precipitation and resulted in a continuous FCC -> BCC martensitic transformation and a transformation-induced plasticity effect. The excellent mechanical properties of the alloy were attributed to the synergistic effects of hetero-deformation induced strengthening, precipitation strengthening, and TRIP.
Article
Chemistry, Physical
S. Y. Liang, L. T. Zhang, B. Wang, Y. J. Wang, E. Pineda, J. C. Qiao
Summary: This study focuses on the influence of the thermomechanical protocol on the aging or rejuvenation of glass by decoupling the thermal and mechanical processes. The results show that Labased metallic glass exhibits material hypomnesia, with a clearer rejuvenation trend observed after imposing increasing amplitude strain oscillations. There is a threshold value of the oscillation amplitude that separates the effects of the protocol into acceleration of aging or rejuvenation. This study reveals the correlation between the thermomechanical properties of metallic glass and the previous application of strain oscillations of various amplitudes, providing an effective tool for regulating the structural state of metallic glasses through a simple-operated method.
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Chemistry, Physical
D. Dubaux, J. Zollinger, M. -C. de Weerd, J. Ghanbaja, S. Mathieu, S. Migot, P. Boulet, S. Sturm, V. Fournee, M. Sicot, J. Ledieu
Summary: We report the formation of large and highly twinned dendrites of the Al13Fe4 approximant phase embedded in an fcc Al-rich matrix. Using a rapid cooling technique, the approximant appears as a 10-fold dendrite. The grain distributions within the arm are complex and a single dendrite arm can contain up to four different orientations. Three types of twins, namely {100}, {001} and {201} twins, have been identified. A growth mechanism involving heteroepitaxial growth from a decagonal Al-Fe quasicrystalline seed is proposed to explain the formation of these specific 10-fold motifs.
Article
Chemistry, Physical
Ming Yang, Yibo Zhang, Jie Dong, Yan Huang, Zhichao Lu, Liang Wang, Xuerui Wei, Zhengdong Fu, Jinkui Zhao, Wenli Song, Wei Li, Yuntao Liu, Dong Ma
Summary: A multi-element microalloying strategy has been used to improve the microstructure and mechanical properties of CuZr-based bulk metallic glass composites. Microalloying effectively refines the CuZr phase and results in finely dispersed B2 crystallites embedded in the BMG matrix, leading to the formation of centimeter-sized BMGCs with good mechanical properties.
Article
Chemistry, Physical
Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Ziyi Wang, Aibin Li, Zongning Chen, Muhammad Imran, Lin Geng
Summary: The homogeneous superelastic behavior in shape memory alloys (SMAs) is crucial for their functional and structural fatigue properties, as well as their stable elastocaloric effect (eCE). In this study, a Ti-22Nb-4Zr-2Ta plate was prepared with a strong recrystallized texture, resulting in a completely recoverable superelastic strain and narrow hysteresis. The observation of strain and temperature evolution revealed the importance of diffuse transformation and favorable texture in achieving mesoscopically homogeneous transformation and related elastocaloric effect.
Article
Chemistry, Physical
Mohammad Navazani, Sitarama Raju Kada, Daniel Fabijanic, Matthew Barnett
Summary: This study investigates the effect of Cu and Al addition on an alloy containing multiple principal elements. The results show that adding small amounts of Cu can improve the alloy's ductility and the hardness of the FCC phase can be predicted using a hybrid model. Unlike previous studies, the corrosion resistance of the alloy is not affected by Cu addition, indicating its potential for further development into a fine-grained stainless steel alloy.
Article
Chemistry, Physical
Fatemeh Azizian, Homam Naffakh-Moosavy, Fatemeh Bagheri
Summary: Novel biodegradable Zn-xCu-0.8Mn-0.4Ag alloys were prepared in this study, and the effects of Cu addition and hot extrusion process on microstructure, mechanical properties, and cytotoxicity of the alloys were investigated. The results showed that adding copper and performing a hot extrusion process can significantly improve the mechanical properties of the alloys, making them potential candidates for cardiovascular stents.
Article
Chemistry, Physical
Ivan A. Ditenberg, Denis A. Osipov, Ivan Smirnov, Konstantin V. Grinyaev
Summary: This study investigates the effect of high-temperature annealing on the structural-phase state and microhardness of Ni3Al samples obtained by spark plasma sintering after high-energy ball milling. The results show that certain annealing temperatures promote grain growth and high-density nucleation, leading to the formation of a fine-grained structural state. The study also analyzes the influence of annealing temperature on the strengthening mechanisms.
