Article
Materials Science, Multidisciplinary
Dong Huang, Yanxin Zhuang
Summary: In this study, the coherent precipitation strengthening of L1(2) phase and Face-Centered Cubic (FCC) -Hexagonal Close-Packed (HCP) type martensitic transformation were successfully combined in a single alloy, resulting in increased yield strength and uniform elongation. The presence of L1(2) phase was found to directly affect the deformation mode of the alloy.
MATERIALS & DESIGN
(2022)
Article
Physics, Multidisciplinary
Tamsin E. Whitfield, Howard J. Stone, C. Neil Jones, Nicholas G. Jones
Summary: Research has shown that refractory metal high-entropy superalloys exhibit microstructural instability after high temperature exposure, leading to phase changes, morphology alterations, and intragranular precipitation, which may impact the alloy's mechanical and environmental properties.
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
Nanoscience & Nanotechnology
Young Mok Kim, Sangwon Lee, Ki Jeong Kim, Tae Jin Jang, Hyeon-Seok Do, Kyuseon Jang, Won Seok Choi, Min-Gu Jo, Byeong-Joo Lee, Pyuck-Pa Choi, Seok Su Sohn
Summary: In this study, Mo is used to generate strengthening phases and expand the region of a face-centered cubic (FCC) solid-solution phase at lower temperatures in the equiatomic VCoNi alloy. The substitution of Mo successfully adds a homogeneous L12 phase to provide strengthening effects and overcomes the limitations of the VCoNi alloy, but appropriate heat treatment is required to prevent brittleness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Yafei Li, Weijian Chen, Chuanyang Lu, Huaxin Li, Wenjian Zheng, Yinghe Ma, Ying Jin, Weiya Jin, Zengliang Gao, Jianguo Yang, Yanming He
Summary: This study investigated the effect of microstructural evolution on the creep behavior and deformation mechanism of the AlCoCrFeNi2.1 high-entropy alloys. The results showed that precipitation behavior was responsible for the accelerated creep and reduced creep life at high temperatures. The study also revealed differences in creep deformation mechanism and fracture behavior at different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
X. Zhou, J. Chen, R. Ding, H. Wu, J. Du, J. He, W. Wang, W. Sun, Y. Liu, G. Sha, H. Pan
Summary: A novel C-doped high entropy alloy (Al0.5CoFeNiC0.1) with nano-scale coherent precipitates was successfully designed and fabricated by arc-melting. The effect of nano-sized particles on the mechanical behavior of the alloy has been evaluated by tensile testing. DFT simulation shows that C triggers the ordered arrangement of Al and Fe/Ni/Co, thus promoting the formation of k' phase. The addition of 2.8 at.% C to as-cast Al0.5CoFeNi leads to a high volume fraction of k0 precipitates with an average size of -35 nm, enhancing dramatically the yield strength compared to its carbon-free counterpart.
MATERIALS TODAY NANO
(2023)
Article
Nanoscience & Nanotechnology
Fuxin Liu, Songshen Chen, Benpeng Wang, Liang Wang, Yao Xiao, Lu Wang, Shihai Sun, Yunfei Xue
Summary: This paper describes the induction of abundant coherent B2 nanoprecipitates in Ti-Zr-Al-Nb-V LHEAs through tailoring the aging treatment, which can strengthen the alloy by around 20%. The inhibition of dislocation propagation and the delocalization of deformation are achieved, leading to considerable improvement in strength and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Qing Wang, Jincan Han, Yufeng Liu, Zhongwei Zhang, Chuang Dong, Peter K. Liaw
Summary: A new body-centered-cubic (BCC)-based refractory high entropy alloy was developed, with coherent precipitation observed. Cuboidal nanoprecipitates were formed in an 873 K-aged alloy, with a moderate lattice misfit. The coexistence of B2 and Zr5Al3 phases was found, with deteriorated coherency observed at higher aging temperatures. Segregations of Nb/Ta and Ti/Zr led to the presence of two kinds of BCC phases.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Zhong Wang, Mingjie Qin, Min Zhang, Huijun Yang, Junwei Qiao, Zhihua Wang
Summary: In this study, cobalt-free Fe50Mn20Cr20Ni10 medium-entropy alloys were developed using the metastable engineering strategy at cryogenic temperature. The uniaxial tensile tests demonstrated excellent strain-hardening capacity and strong-plastic synergy.
Article
Materials Science, Multidisciplinary
Nachiket Keskar, K. V. Mani Krishna, Chiradeep Gupta, J. B. Singh, R. Tewari
Summary: The development of microstructure, texture, and mechanical properties in single and two-phase recrystallized and aged Ni-Cr binary alloys were investigated. The recrystallization of γ-Ni phase was influenced by the deformation texture and the concurrent precipitation of α-Cr phase in the two-phase alloys. The α-Cr precipitation resulted in the hardening of the aged two-phase alloys. The deformation texture after aging could be correlated to the change in stacking fault energy due to Cr content. The dominance of certain recrystallization textures could be explained by the advantage of "oriented growth" offered by the concurrent α-Cr precipitation on grain boundaries.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
G. H. Xia, Z. L. Ma, Z. Q. Xu, M. Wang, X. W. Cheng, H. N. Cai
Summary: Precipitation strengthening is an effective method to enhance engineering structural materials, with high-density nanoprecipitates in alloys being a significant challenge. This study developed novel CoFeNiVTa(Nb) high-entropy alloys with high-density epsilon-D0(19) nanoprecipitates featuring Widmanstatten patterns. The superior thermodynamic stability of delta phase compared to epsilon phase was confirmed, contributing to improved strengthens and friction properties of the alloys.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Zhong Zheng, Hong Zhao, Lixian Sun, Marcela M. Bilek, Zongwen Liu
Summary: The thermal stability of dual-phase AlCrFeCoNiCu0.5 high entropy alloy thin films at high temperatures (up to 600 degrees C, under vacuum) was studied. The microstructure and chemical composition evolution were analyzed using X-ray diffraction, transmission Kikuchi diffraction, and transmission electron microscopy. The mechanical properties were determined by nanoindentation. The results showed that the FCC phase fraction increased with annealing temperature, and the morphology and size of the grains varied with temperature. The mechanical properties of the films also improved with annealing temperature. These findings provide important insights into the microstructure and property changes of dual-phase HEA thin films at high temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Dong Huang, Yanxin Zhuang
Summary: A new high-entropy alloy, designed in this study, showed significantly improved yield strength and uniform elongation at room temperature by utilizing NiAl phase as a strengthening component and TRIP effect. The microstructure evolution and deformation mechanisms of the alloy were thoroughly investigated. Stacking faults and E3 twin boundaries were confirmed as the nucleation sites of HCP phase, indicating a promising combination of precipitation strengthening and transformation-induced plasticity in guiding high-performance alloy design.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Youyou Zhang, Huibin Wu, Xinpan Yu, Di Tang, Rui Yuan, Hui Sun
Summary: In this study, the microstructure and mechanical properties of CrxMnFeNi high-entropy alloy were investigated. It was found that a dual-phase FCC/BCC structure was formed when the Cr content exceeded a threshold value. The presence of BCC phase in the dual-phase alloy significantly increased strength but decreased ductility, showing a good strength-ductility matching mechanism.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Diaa Mereib, Judith Monnier, Loic Perriere, Benjamin Villeroy, Mathilde Laurent-Brocq
Summary: Chemically architectured alloys are a new concept of microstructure, where the strengthening effect is induced by a 3D network of composition fluctuations called interphase. The width and volume fraction of the interphase can be controlled by processing parameters, such as sintering temperature and applied pressure. This study demonstrates that chemically architectured alloys can achieve efficient and tunable strengthening by optimizing the microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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)