Article
Materials Science, Multidisciplinary
M. Zhang, E. P. George, J. C. Gibeling
Summary: The stress reduction creep experiments on a CrMnFeCoNi high-entropy alloy at 1073 K revealed the dominant role of solid solution hardening mechanism in the creep behavior, with variations in behavior observed at different applied stresses. The study provides valuable insights for understanding the high temperature mechanical behavior of this alloy and suggests the potential for developing a unified treatment for dislocation glide kinetics across a range of temperatures.
Review
Chemistry, Multidisciplinary
Jinmei Chen, Xiaosong Jiang, Hongliang Sun, Zhenyi Shao, Yongjian Fang, Rui Shu
Summary: High-entropy alloys (HEAs) have gained attention for their excellent performance in aerospace, ultrahigh temperature, high-performance, and biomimetic materials. Current research on HEAs focuses on microstructure and mechanical properties, with the emergence of medium-entropy alloys, metastable HEAs, dual-phase HEAs, and multiphase HEAs adding complexity to the system.
NANOTECHNOLOGY REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Przemyslaw Litwa, Everth Hernandez-Nava, Dikai Guan, Russell Goodall, Krystian K. Wika
Summary: The study found that the CrMnFeCoNi alloy has better machinability than the AISI 304L stainless steel, likely due to its plastic behavior, moderate strength, and significant ductility. This suggests that alloys with good machinability can be found in the class of High Entropy Alloys, and early assessment of machinability can guide alloy design activities.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Jie Sun, Wenxiang Zhao, Pei Yan, Siyu Li, Zhicheng Dai, Li Jiao, Tianyang Qiu, Xibin Wang
Summary: This paper investigates the high temperature tensile properties of a single-phase FCC high entropy alloy and reveals that hot forging can refine the grain size and improve the tensile strength. The alloy exhibits different mechanical behaviors and fracture modes at different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Caitao Fan, Luyao Li, Wenxin Wen, Hongzhen Li, Jianan Fu, Wenqing Ruan, Shuai Ren, Sajad Sohrabi, Zhenxuan Zhang, Xiong Liang, Jiang Ma
Summary: Due to their unique design concept, high-entropy alloys (HEAs) exhibit unusual properties and lead to an emerging new field. In this study, it is shown that a typical face-centered cubic crystalline phase CoCrFeNiMn HEA can be easily transformed into the amorphous phase through ultrasonic vibration treatment at a frequency of 20000 Hz. Nanoscale hierarchical features, including twins, stacking faults bands, hexagonal-close packed phase bands, and amorphous bands, can be clearly observed in samples treated with different ultrasonic vibration energies. The main mechanism of ultrasonic vibration-induced amorphization is the promotion of amorphous phase formation through grain refinement when the defect density at grain boundaries reaches a critical level. Furthermore, mechanical instability is easily induced by ultrasonic vibration at high strain rate to generate amorphous phase inside grains. As a result of ultrasonic vibration treatment, the HEA samples exhibit significant improvement in mechanical performance, mainly attributed to microstructure evolution, especially the generation of the amorphous phase, such as yielding strength and hardness. This rapid amorphization process not only provides a potential strengthening mechanism for HEAs but also offers a novel approach to investigate the crystal-amorphous transition problem.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Samrat Tamuly, Saurabh Dixit, Boopathy Kombaiah, Prasenjit Khanikar
Summary: An iron-rich high entropy alloy Al0.65CoCrFe2Ni, consisting of both FCC and BCC phases, was designed and fabricated using induction melting and suction casting at different scales. The results showed that the alloy suction cast at lab scale exhibited higher compressive yield strength compared to the industrially cast alloy. The study also analyzed the contributions of various factors to the strength of the alloys and found that cold working can effectively enhance the strength of the dual-phase high entropy alloy processed at a large scale.
METALS AND MATERIALS INTERNATIONAL
(2023)
Review
Materials Science, Multidisciplinary
Naqash Ali, Liqiang Zhang, Dongming Liu, Hongwei Zhou, Kiran Sanaullah, Chaojie Zhang, Jianhua Chu, Yi Nian, Jinjun Cheng
Summary: High entropy alloys (HEAs) have emerged as a potential candidate for industrial applications due to their excellent mechanical properties at various temperatures. However, the trade-off between strength and ductility in HEAs requires modifications in conventional strengthening mechanisms such as adjusting stacking fault energy and promoting twin formation and phase transformation.
MATERIALS TODAY COMMUNICATIONS
(2022)
Review
Metallurgy & Metallurgical Engineering
Janet M. Meier, Josh Caris, Alan A. Luo
Summary: Mg-rare earth (RE) based systems offer commercial alloys and alloy development opportunities for high strength applications. Phase diagrams and strengthening mechanisms in these complex systems, including precipitation and LPSO phases, are critical for understanding and enhancing alloy properties. Further research is necessary to explore the combination of these phases for alloy design and industrial applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Yufang Zhao, Yaqiang Wang, Kai Wu, Jinyu Zhang, Gang Liu, Jun Sun
Summary: Introducing heterogeneous interfaces by constructing laminated structure is a promising approach to achieve controllable strengthening behavior of high entropy alloys. In this study, the microstructural evolution and mechanical properties of Ni/Fe50Mn30Co10Ni10 nanolaminates were systematically investigated. The nanoindentation hardness of the nanolaminates initially increased and then decreased with decreasing layer thickness, reaching a maximum value at around 25 nm. The transformation of constraining barrier for dislocation slipping from the heterogeneous interfaces to columnar grain boundaries was identified as the cause for this behavior. The interfacial structure transformed from incoherent to completely coherent below 25 nm, and both constituent layers contributed significantly to the plastic deformation. The h-dependent mechanical behavior can be explained by the co-deformation of constituent layers and the structural evolution of the interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Metallurgy & Metallurgical Engineering
Janet M. Meier, Josh Caris, Alan A. Luo
Summary: Mg-rare earth (RE) based systems offer important commercial alloys and opportunities for high strength applications. The phase diagrams, microstructure, and strengthening mechanisms of these systems are complex. This review provides critical insights into phase equilibria and strengthening mechanisms, highlights the combination of precipitation and long period stacking order (LPSO) phases for superior strength and ductility in Mg-RE based cast alloys, and suggests future research directions for alloy design and industrial scale applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Xin Xian, Zhi-Hong Zhong, Li-Jing Lin, Zhi-Xiong Zhu, Chang Chen, Yu-Cheng Wu
Summary: This paper investigates the strengthening of CrMnFeCoNi alloy by adding aluminum. The experimental results show that a phase structure transition from fcc to bcc occurs when a sufficient amount of aluminum is added, leading to an increase in yield strength and hardness. By adjusting the alloy composition, it is possible to achieve high strength and sufficient ductility in high-entropy alloys.
Article
Materials Science, Multidisciplinary
Y. Xing, C. J. Li, Y. K. Mu, Y. D. Jia, K. K. Song, J. Tan, G. Wang, Z. Q. Zhang, J. H. Yi, J. Eckert
Summary: A multiphase CrMnFeCoNi high-entropy alloy (HEA) material was successfully prepared using a powder metallurgy process, and the critical roles of nanoscale particle formation and deformation twinning in the strain hardening ability of the material were revealed through microstructural characterization and mechanical testing.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Sang Hun Shim, Hesam Pouraliakbar, Byung Ju Lee, Yong Keun Kim, Mohsen Saboktakin Rizi, Sun Ig Hong
Summary: This study observed the microstructure of as-cast CoCrCu1.5MnNi high entropy alloy and found different sized precipitates distributed in dendritic and interdendritic regions. The alloy exhibited excellent yield strength/ductility combinations at both room and cryogenic temperatures due to precipitation strengthening and quasi-linear strain hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Zhongsheng Yang, Zhijun Wang, Bojing Guo, Rongtian Cao, Qingfeng Wu, Dingcong Cui, Kaiwei Zhang, Junjie Li, Jincheng Wang, Feng He
Summary: This study investigated the effects of pre-strain degree on the precipitation behavior of Ni2CoCrFeTi0.18Al0.12 high-entropy alloys. The results revealed a non-monotonous effect of pre-strain on the precipitation behavior, where low pre-strain can accelerate the precipitation while high pre-strain weakens this effect. Additionally, pre-strain can control the precipitation strengthening, dislocation strengthening, and grain boundary strengthening of high-entropy alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yokasundery Muniandy, Mengwei He, Mehdi Eizadjou, Easo P. George, Jamie J. Kruzic, Simon P. Ringer, Bernd Gludovatz
Summary: Single phase high-entropy alloys may not always be random solid solutions with homogeneous elemental distributions, as their atomic arrangements and chemical homogeneity can depend on processing history. Electron probe microanalysis (EPMA) and atomprobe tomography (APT) were used to study CrMnFeCoNi HEAs with different processing histories. The study found nanoscale compositional heterogeneities in addition to microscale heterogeneities, showing a combination of EPMA and APT techniques can reliably identify chemical heterogeneities across nanometer to micrometer length scales.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)