Article
Materials Science, Multidisciplinary
Xinyu Zhang, Chuanwei Li, Mengyao Zheng, Xudong Yang, Zhenhua Ye, Jianfeng Gu
Summary: This paper focuses on a novel gradient TiAl alloy fabricated by high-power direct laser deposition, which exhibits varying chemical composition, microstructure, and mechanical properties along the building direction. The results show that the aluminum concentration decreases as the height increases, leading to changes in the microstructure. The hardness increases with height while the plasticity reaches a minimum in the middle region.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Huaxin Li, Weijian Shen, Weijian Chen, Weizhen Wang, Guohao Liu, Chuanyang Lu, Wenjian Zheng, Yinghe Ma, Jianguo Yang, Zhenyu Ding, Hai Zou, Yanming He
Summary: A high-performance high-entropy alloy (HEA) brazed joint with a microstructure similar to the base metal was successfully fabricated through proper interface control. The joint shear strength was significantly improved with a strengthening mechanism involving high-entropy solid solution, precipitation strengthening, and grain refinement. The brazed joint exhibited desirable high-temperature stability with minor degradation of strength after annealing, showing great potential for high temperature applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Di Ouyang, Pengcheng Zhang, Cheng Zhang, Ning Li, K. C. Chan, Lin Liu
Summary: A high-strength lamellar high-entropy alloy (HEA) of Zr45Ti31.5Nb13.5Al10 with excellent ductility was fabricated by in-situ alloying of blended elemental powders via laser directed energy deposition (DED). Microstructure characterizations suggest that the molten pools with body-centred cubic (BCC) structure and heat affected zones with mixed structure of BCC + ordered BCC (B2) nanoprecipitates, are alternately distributed in the DEDprocessed HEA with a lamellar structure. This research provides new options for the design and manufacturing of HEAs with outstanding mechanical properties for structural applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
P. X. Yan, J. Chang, W. L. Wang, X. N. Zhu, M. J. Lin, B. Wei
Summary: The liquid CoCrFeNiMo0.8 high entropy alloy (HEA) undergoes undercooling and solidifies rapidly. The transition from slow lamellar eutectic growth to rapid anomalous eutectic growth is observed, which affects crystal orientation and mechanical properties. The growth mechanism transition is due to independent nucleation and cooperative branched growth of the two eutectic phases. The structural refinement and increase in volume fraction of anomalous eutectic contribute to the improved hardness, compression strength, and ductility of the alloy.
Article
Chemistry, Physical
Xiaofeng Li, Yinghao Feng, Xu Wang, Huiqi Xie, Xiaohui Yang, Bin Liu, Yuankui Cao
Summary: In this study, AlCrFeNiMnx high-entropy alloy coatings were successfully prepared on a copper substrate by laser cladding, with the addition of Mn leading to refined grains and improved mechanical properties, especially when the Mn content was 0.5.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xuesong Zhang, Yinbao Tian, Sunusi Marwana Manladan, Yan Cui, Keping Geng, Yangchuan Cai, Jian Han
Summary: High-entropy alloys (HEAs) offer great potential for various applications, but achieving the ideal combination of tensile strength and ductility remains challenging. This study used laser melting deposition (LMD) technology to fabricate Al0.5FeCoCrNi walls with different laser powers. The results showed that increasing laser power led to a decrease in tensile strength and an increase in ductility. Additionally, quantitative calculations revealed that grain boundary strengthening and dislocation strengthening were the two main forms of strengthening for the walls.
Article
Materials Science, Multidisciplinary
Yunfei Li, Huameng Fu, Zhengwang Zhu, Long Zhang, Zhengkun Li, Hong Li, Haifeng Zhang
Summary: In this study, the effects of the Fe/Ni ratio on the microstructure, mechanical properties, and corrosion resistance of FexNi65-xCr20Al10Nb5 alloy in a 3.5 wt% NaCl solution were systematically investigated. It was observed that the dominant phases shifted from FCC to BCC with an increase in the Fe/Ni molar ratio. The strength of the alloy increased with a higher Fe/Ni ratio, while the plasticity decreased. The alloy exhibited the best corrosion resistance when x = 35, which was attributed to the dominant presence of FCC phases in the dendritic region.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mina Zhang, Dafeng Wang, Longjun He, Xuyang Ye, Wenwu Zhang
Summary: The study evaluated the laser beam welding performance of AlCoCrFeNi2.1 EHEA, finding that a fully penetrated, defect-free joint was obtained through LBW, with refined columnar grains and a eutectic lamellar microstructure in the fusion zone, leading to superior tensile strength compared to the base metal.
Article
Engineering, Manufacturing
Deepak Sharma, Sitarama Raju Kada, Daniel Fabijanic, David Parfitt, Bo Chen, Bryan Roebuck, Michael E. Fitzpatrick, Matthew Robert Barnett
Summary: This study explores the ageing response of DLD built Ti-5553 beta-Ti alloy, aiming to achieve a bimodal (beta + alpha) microstructure that provides improved properties. Direct ageing at a fast heating rate under specific conditions resulted in a unique microstructure with refined intragranular and discontinuous grain boundary alpha-phase. The interparticle spacing between the alpha-phase showed correlation with microhardness and yield stress values for all aged samples.
ADDITIVE MANUFACTURING
(2021)
Article
Nanoscience & Nanotechnology
Liufei Huang, Yaoning Sun, Na Chen, Hengwei Luan, Guomin Le, Xue Liu, Yaqi Ji, Yiping Lu, Peter K. Liaw, Xiaoshan Yang, Yuzhao Zhou, Jinfeng Li
Summary: In this study, AlCoCrFeNi2.1 eutectic high-entropy alloy was prepared using laser metal deposition (LMD) technique. The LMD-fabricated alloy showed significantly enhanced tensile strength and increased ductility compared to conventionally cast samples. The improved mechanical properties were attributed to the refinement of the uniformly distributed eutectic structure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Haoping Peng, Siyao Xie, Pengda Niu, Zhijian Zhang, Tiechui Yuan, Zhiqiang Ren, Xiaoming Wang, Yang Zhao, Ruidi Li
Summary: Al0.3CoCrFeNi high-entropy alloy was additively manufactured by laser melting deposition, and its microstructure and tensile properties were studied. Thermal stress induced dislocation loops and cracks, leading to poor ductility in the samples, while annealing facilitated further precipitation of phases introducing hardening effects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
Yansong Zhang, Huaming Wang, Yanyan Zhu, Shuquan Zhang, Fang Cheng, Junwei Yang, Bing Su, Chen Yang
Summary: Lightweight refractory high-entropy alloys (LRHEAs) have lower density and better ductility compared to other refractory high-entropy alloys. Laser directed energy deposition additive manufacturing (LDED) technology is an ideal process for preparing LRHEAs. This study investigated the microstructure evolution and the plastic deformation mechanisms of a new LRHEA Al0.3NbTi3VZr1.5 fabricated by LDED.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Physical
Puchang Cui, Wei Wang, Zhisheng Nong, Zhonghong Lai, Yong Liu, Jingchuan Zhu
Summary: High-entropy alloys have gained attention as potential materials for future high-temperature structural superalloys. The role of the Cr element in microstructure and properties has been revealed, showing significant improvement in strength and ductility. The density and melting point of the alloys increase with higher Cr content. The mechanical properties, including compressive strength and plasticity, are optimized, and the high-temperature mechanical properties are greatly enhanced.
Article
Materials Science, Multidisciplinary
J. P. Oliveira, A. Shamsolhodaei, Jiajia Shen, J. G. Lopes, R. M. Goncalves, Mariana de Brito Ferraz, Lourenco Picarra, Z. Zeng, N. Schell, N. Zhou, Hyoung Seop Kim
Summary: This study investigates the improvement of joint performance between high entropy alloys and stainless steel by changing the base material condition. The microstructure evolution and mechanical performance of the welded joint are evaluated, and the composition changes across the fusion zone are considered to predict the microstructure evolution. The results provide insights into the mechanism for improving joint performance.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
Xiaolei Yan, Hui Guo, Wei Yang, Shujie Pang, Qing Wang, Ying Liu, Peter K. Liaw, Tao Zhang
Summary: The study demonstrates that increasing the Cr content in Al-Cr-Fe-Co-Ni high-entropy alloys can improve the corrosion resistance and mechanical properties of the alloys. With the increase in Cr content, both the pitting resistance and strength of the alloys are enhanced.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Geochemistry & Geophysics
Michael K. Sly, Arashdeep Thind, Rohan Mishra, Katharine Flores, Philip Skemer
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Thermodynamics
Katherine Baskin, Katharine M. Flores, Patricia B. Weisensee
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Geochemistry & Geophysics
Kelly Kranjc, Arashdeep S. Thind, Albina Y. Borisevich, Rohan Mishra, Katharine M. Flores, Philip Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Physics, Applied
Zhaohan Zhang, Mu Li, Katharine Flores, Rohan Mishra
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Junnan Wu, Robert W. Standley, Katharine M. Flores
Summary: In this study, it was found that germanium doping in silicon wafers with very low oxygen concentration does not have a significant effect on dislocation mobility. Germanium is unable to lock dislocations or change the behavior of oxygen-dislocation locking in silicon at high concentrations due to small lattice mismatch and low chemical interactions with silicon.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Materials Science, Multidisciplinary
Mu Li, Zhaohan Zhang, Arashdeep S. Thind, Guodong Ren, Rohan Mishra, Katharine Flores
Summary: The equiatomic NbVZr alloy features a dendritic BCC solid solution and Laves phases, with Nb contributing to the stability of these phases. The Laves phases strengthen the material by acting as obstacles to dislocation motion. High concentration of stacking faults in the Laves region confirms the low stacking fault energy predicted by calculations, which is expected to result in additional plasticity.
Review
Materials Science, Multidisciplinary
Daniel B. Miracle, Mu Li, Zhaohan Zhang, Rohan Mishra, Katharine M. Flores
Summary: This review evaluates recent progress in CHT evaluations for structural materials, highlighting the application of high-throughput computations and new synthesis methods. It also points out challenges in measurement and production, and proposes a strategy to enhance efficiency by conducting two layers of evaluations.
ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 51, 2021
(2021)
Article
Geochemistry & Geophysics
Benjamin Strozewski, Michael K. Sly, Katharine M. Flores, Philip Skemer
Summary: Quartz, an abundant mineral in Earth's crust, is difficult to measure viscoplastic rheology at low temperatures, but instrumented nanoindentation experiments allow for measurement over a wide temperature range. The study found that indentation hardness and yield stress of quartz are not affected by water content and only weakly depend on crystallographic orientation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Chemistry, Physical
W. Porter Weeks, Katharine M. Flores
Summary: Researchers have used geometric alignment and density-based clustering algorithms to quantitatively describe the short-range atomic structure in the liquid state of five metallic glass-forming systems. They found that each liquid is composed of geometrically-similar atomic clusters, and the distribution of these clusters is inversely correlated to the glass-forming ability observed experimentally.
Article
Materials Science, Multidisciplinary
Zhaohan Zhang, Mu Li, John Cavin, Katharine Flores, Rohan Mishra
Summary: This study presents a model based on first-principles calculations to predict the thermodynamic stability of multicomponent equimolar solid solutions in a high-throughput manner. The model has been successfully applied to screen over 20,000 compositions and accurately predict the phase evolution of refractory complex concentrated alloys (RCCAs).
Article
Materials Science, Ceramics
W. Porter Weeks, Katharine M. Flores
Summary: Vickers indentation methods are popular for determining hardness, fracture toughness, and crack initiation resistance in silicate glasses due to their simplicity and efficiency. However, obtaining consistent and repeatable results from these measurements is challenging. In this study, we investigated the effects of applied load, dwell time, and post-indentation observation time on the precision of hardness and fracture toughness values for soda-lime silicate glass measured via Vickers microindentation. The results show that low applied loads and short dwell times result in low precision, while longer dwell times lead to higher precision and load-independent fracture toughness. These findings suggest that Vickers microindentation could be a reliable technique for measuring mechanical properties of silicate glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
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)
