Article
Materials Science, Coatings & Films
Qingkai Shen, Jiaxiang Xue, Xiaoyan Yu, Zehong Zheng, Ning Ou
Summary: In this study, an innovative triple-wire plasma arc cladding method was used to successfully prepare Cr-Fe-Ni-Ti-x HEA coatings. It was found that increasing the titanium content resulted in a change in the coating structure, an increase in microhardness, and a significant improvement in wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ao Fu, Yuankui Cao, Zhonghao Xie, Jian Wang, Bin Liu
Summary: A novel non-equiatomic high entropy alloy (HEA) Al15.85Fe11.15Co32.11Cr10.76Ni30.13 was fabricated using a powder metallurgy method. The HEA exhibits a dual-phase microstructure consisting of face-centered-cubic (FCC) and body-center cubic (BCC) phases. It possesses high compressive yield strength, fracture strength, fracture strain, and strength at high temperature due to the uniform dispersion of L12 and B2 nanoprecipitates in the FCC and BCC phases, respectively. This finding provides guidance for the development of high-performance structural materials with a balance of strength and ductility for industrial applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yu-Jin Hwang, Kyu-Sik Kim, Young Sang Na, Ka Ram Lim, Kee-Ahn Lee
Summary: This study investigated the microstructure, high-temperature oxidation properties, and mechanism of a non-equiatomic Fe-Cr-Ni-Al medium entropy alloy (MEA). The microstructural observation revealed coarse grains and evenly distributed cuboidal precipitates within the grains. The alloy exhibited excellent high-temperature oxidation resistance due to the formation of a dense, stable Al2O3 layer, regardless of temperature conditions, and no breakaway oxidation occurred.
Article
Engineering, Mechanical
Le Li, Zhenghao Chen, Koretaka Yuge, Kyosuke Kishida, Haruyuki Inui, Martin Heilmaier, Easo P. George
Summary: The plastic deformation behavior of equiatomic Cr-Fe-Co-Ni medium-entropy alloy was investigated through compression and tension experiments. The critical resolved shear stress (CRSS) for {111}<1((1)over bar)0> slip was found to be 44-45 MPa at room temperature without significant tension-compression asymmetry. The CRSS increased rapidly with decreasing temperature, but the temperature dependence dulled below 77 K due to the inertia effect. The 0 K CRSS was determined to be 200 MPa, higher than Cr-Mn-Fe-Co-Ni high-entropy alloy but lower than Cr-Co-Ni medium-entropy alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Chokkakula L. P. Pavithra, Reddy Kunda Siri Kiran Janardhana, Kolan Madhav Reddy, Chandrasekhar Murapaka, Xiaodong Wang, Suhash Ranjan Dey
Summary: This study achieved the synthesis of one-dimensional high-entropy alloy nanowires through an electrochemical method, demonstrating a unique nanostructure and uniform chemical composition, which opens up new possibilities for the application of high-entropy alloys at lower dimensions.
MATERIALS RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jianbing Gao, Zhenlin Xu, Xudong Fang, Junjing He, Weihuo Li, Xiaojie Du, Yizhu He, Xiquan Jia, Shengxuan Zhou
Summary: In this study, the effect of aging on the creep resistance of a Fe-Cr-Ni medium-entropy alloy (MEA) was investigated. The precipitate evolution in the aged MEA was analyzed, and it was found that the nano-sized Cu-rich and NbC precipitates significantly improved the creep resistance after long-term aging.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Qingkai Shen, Xiangdong Kong, Xizhang Chen
Summary: Non-equimolar Al-Co-Cr-Fe-Ni high-entropy alloy was fabricated by CCW-AAM, and the microstructure evolution and mechanical properties after heat treatment at different temperatures were investigated. The hardness and strength of the alloy increased with heat treatment temperature, while the elongation decreased.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Heling Liu, Chuanxiao Peng, Xuelian Li, Shenghai Wang, Li Wang
Summary: The research revealed that Cu-rich grain boundaries or grains can lower the strength and ductility of high-entropy alloys, with this change in mechanical properties closely related to the deformation behavior induced by phase separation.
Article
Materials Science, Multidisciplinary
Jianbing Gao, Lei Hu, Ninshu Ma, Xudong Fang, Zhenlin Xu, Yizhu He
Summary: The growth behavior and stress/strain field evolution of nano-sized Cu-rich precipitates in an Fe-Cr-Ni-Cu medium-entropy alloy were investigated using the phase field approach coupled with the CALPHAD method and elastic-plastic mechanics. The results showed that creep strain intensified with the coarsening of Cu-rich particles, and the size of the particles had an influence on the creep strain. Fine Cu-rich particles tended to be sheared by plastic strain, while coarse particles were bypassed due to stress concentration around the interface.
Article
Materials Science, Multidisciplinary
Qingkai Shen, Xiangdong Kong, Xizhang Chen
Summary: In this study, a new type of combined cable wire (CCW) was designed and developed for arc additive manufacturing of non-equiatomic high-entropy alloy, showing high deposition efficiency, energy saving capability, and superior mechanical properties. The microstructural observations revealed BCC and FCC phases, good bonding between layers, and defect-free microstructure in the developed alloy. By controlling heat input through torch travel speed, the microstructure and mechanical properties of the alloy can be managed effectively.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Shao-yu Yen, Yu-chen Liu, Shun-hsiang Chu, Che-wei Chang, Shih-kang Lin, Ming-Hung Tsai
Summary: The Al10Co19Cr16Fe20Ni35 high entropy alloy was fabricated and characterized using transmission electron microscopy and CALPHAD method. The microstructure consisted of a face-centered cubic (fcc) phase matrix with B2 precipitates. The designed alloy showed a product of ultimate tensile strength and elongation of 38 GPa.%, which was among the highest in the Al-Co-Cr-Fe-Ni systems. The precipitation strengthening mechanism was evaluated using the Ashby-Orowan model. The high strength and high elongation in the designed alloy resulted from the B2 precipitate-strengthened fcc microstructure.
Article
Materials Science, Multidisciplinary
Lei Wang, Reza Darvishi Kamachali
Summary: This research utilized a density-based model to calculate multi-component grain boundary phase diagrams and studied the Fe-Mn-Cr, Fe-Mn-Ni, Fe-Mn-Co, Fe-Cr-Ni, and Fe-Cr-Co alloy systems. The study found that despite solute segregation enrichment, a grain boundary may have a lower solubility limit than the bulk, promoting interfacial chemical decomposition.
Article
Materials Science, Multidisciplinary
Xuefeng Li, Xiaoya Liu, Nuo Lei, Guangzeng Zhang, Ran Wei, Tan Wang, Shaojie Wu, Yongfu Cai, Shaokang Guan, Fushan Li, Chen Chen
Summary: A novel Cr-Fe-Ni-Al-Si-Mo high-entropy alloy with excellent mechanical properties and corrosion resistance has been designed and prepared by arc-melting. The as-cast alloy consists of fine FCC sideplates and well-dispersed nanoprecipitates in the inter-sideplate region, possibly derived from solid-state phase transformation. This low-cost high-entropy alloy shows great potential for applications in complex and harsh environments.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jongun Moon, Elena Tabachnikova, Sergii Shumilin, Tetiana Hryhorova, Yuri Estrin, Jamieson Brechtl, Peter K. Liaw, Wenqing Wang, Karin A. Dahmen, Alireza Zargaran, Jae Wung Bae, Hyeon-Seok Do, Byeong-Joo Lee, Hyoung Seop Kim
Summary: The medium-entropy alloy Co17.5Cr12.5Fe55Ni10Mo5 demonstrates excellent mechanical properties at cryogenic temperatures, showing high strength, ductility, and strain hardening. It exhibits several unusual features within the extremely low temperature range of 0.5-4.2 K, including anomalies in the temperature dependence of yield strength and tensile ductility, discontinuous plastic deformation (DPF), and changes in deformation-induced martensitic transformation tendency. The observed phenomena may be interrelated and require further investigation.
Article
Chemistry, Physical
Reliance Jain, M. R. Rahul, Poulami Chakraborty, Rama Krushna Sabat, Sumanta Samal, Gandham Phanikumar, Raghvendra Tewari
Summary: In the present study, a novel single-phase FCC high entropy alloy was developed using the ICME approach. The composition guided by simulation was validated and the deformation behavior of the alloy at elevated temperature was discussed. This study demonstrates the rationalization of deformation behavior based on microstructure evolution using EBSD.
JOURNAL OF ALLOYS AND COMPOUNDS
(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)