Article
Materials Science, Multidisciplinary
Olga Mamzurina, Sayed M. Amer, Irina S. Loginova, Maria Glavatskikh, Andrey G. Mochugovskiy, Ruslan Yu Barkov, Andrey Pozdniakov
Summary: The effect of zirconium on the microstructure, phase composition, and mechanical properties of AlCuYb and AlCuGd alloys was investigated. AlCuYbZr/AlCuGdZr alloys exhibited higher hardness values and superior mechanical properties compared to AlCuYb/AlCuGd alloys. Specifically, the AlCuYbZr alloy showed higher yield and tensile strength and good mechanical properties at an annealing temperature of 100 degrees C.
Article
Chemistry, Physical
Hang Xue, Chong Yang, Frederic De Geuser, Peng Zhang, Jinyu Zhang, Bin Chen, Fuzhu Liu, Yong Peng, Jianjun Bian, Gang Liu, Alexis Deschamps, Jun Sun
Summary: Lightweight design and advanced energy applications require high-strength Al alloys for high-temperature use. However, current commercial high-strength Al alloys are limited to low-temperature applications due to difficulties in achieving both high thermal stability and large volume fraction of coherent nanoprecipitates. In this study, we demonstrate a strategy to stabilize coherent nanoprecipitates in Sc-added Al-Cu-Mg-Ag alloys, resulting in exceptional creep resistance and tensile strength at 400 degrees C. The formation of the stable nanoprecipitates is triggered by ledge-aided in situ phase transformation between slow-diffusing Sc and fast-diffusing Cu atoms. This method shows promise for the development of advanced high-temperature light alloys for large-scale industrial production.
Article
Nanoscience & Nanotechnology
Tiffany Wu, A. Plotkowski, A. Shyam, David C. Dunand
Summary: This study investigates the microstructures, thermal stability, ambient temperature strengthening, and creep resistance of three ternary Al-Ce-Ni alloys. The results show that the high volume fraction of intermetallic phases and extremely fine eutectic spacing/fiber diameter contribute to high ambient strengthening and enhanced creep resistance. The alloys also exhibit coarsening resistance up to 425 degrees C and remain substantial creep resistance at 300 degrees C, making them excellent materials for high temperature applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Hunter B. Henderson, Joshua A. Hammons, Alexander A. Baker, Scott K. McCall, Tian T. Li, Aurelien Perron, Zachary C. Sims, Ryan T. Ott, Fanqiang Meng, Michael J. Thompson, David Weiss, Orlando Rios
Summary: Decreasing microstructural length scales to the nanoscale is an effective way of increasing material strength, but it can lead to susceptibility to thermally activated coarsening. In this study, a bulk-nanostructured AlCe-based alloy with high mechanical strength and resistance to thermal coarsening was successfully produced using selective laser melting, demonstrating the potential of combining insoluble alloying elements with additive manufacturing to create stable bulk nanoscale alloys.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Alan J. Ardell
Summary: This study re-examines the kinetics of γ' precipitates in binary Ni-Al alloys. It was found that a previous investigation had made an unfortunate error in unit conversion, rendering all conclusions unreliable. The re-analysis shows that the equations describing skeletal coarsening kinetics are not trustworthy in providing useful quantitative information on the coarsening of non-skeletal microstructures and the elastic energy of γ' precipitates with misfit.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Y. H. Yang, Q. Lei, P. Zhang, W. Y. Wang, X. K. Zhang, Y. P. Li, K. C. Zhou, Z. Li
Summary: The study demonstrated that the addition of Nb can stabilize metastable Cr3Cu precipitates by reducing the interfacial energy between Cu and Cr, resulting in a higher high-temperature strengthening effect. The Cu-Cr-Nb alloy with stable L1(2) structured Cr3Cu precipitates showed significantly improved high-temperature strength compared to the b.c.c. structured Cr precipitates.
MATERIALS RESEARCH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Tiffany Wu, Alex Plotkowski, Amit Shyam, David C. Dunand
Summary: A hypoeutectic, Fe-modified Al-Ce-Ni alloy was studied for its microstructure, thermal stability, ambient temperature strengthening, and creep resistance. The as-cast microstructure consisted of primary Al dendrites and interdendritic eutectic regions, with varying spacing depending on the ingot location. The alloy exhibited good thermal stability and resistance to coarsening after aging at 400°C for 6 weeks. Orowan strengthening and load transfer were identified as the strengthening mechanisms at ambient and elevated temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
P. Sankanit, V. Uthaisangsuk, P. Pandee
Summary: The effects of micro-alloyed Mn, Sc, and Zr on the mechanical properties of Al-Ni alloys were studied. It was found that Mn alloying significantly improved the hardness of the alloy, while the addition of Sc and Zr increased the hardness and coarsening resistance. The alloy with added Sc and Zr showed the greatest potential for use as a load bearing structure at elevated temperatures.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
D. A. Santana, K. R. Santos, C. S. Kiminami, F. G. Coury
Summary: Multi-principal element alloys (MPEAs) with dispersed nanometric precipitates are currently attracting attention in the literature. A new precipitation-hardened multi-principal element alloy, Cr29.7Co29.7Ni35.4Al4.0Ti1.2, shows promising coarsening kinetics and thermal stability, with improved mechanical properties compared to conventional superalloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Sayed Amer, Ruslan Barkov, Andrey Pozdniakov
Summary: The microstructure of Al-Cu-Yb and Al-Cu-Gd alloys in different states was observed and the effects of annealing on microstructure, mechanical properties, and forming properties were studied. The research revealed different recrystallization starting temperatures for the alloys within specific temperature ranges, and annealing resulted in reduced hardness and tensile properties of the alloys.
Article
Materials Science, Multidisciplinary
Zhi-Jun Zhao, Xin-Fu Gu, Meng Li, Ming-Le You, Mohan Chen, Fu-Zhi Dai, Zhang-Zhi Shi
Summary: A nano-precipitate of Si-Mg2Si core-shell structure is discovered in Al alloys for the first time. The orientation relationship between the ss-Mg2Si shell and the Si core is predicted by a near row matching model based on interfacial good matching. First-principles calculation reveals that heterogeneous nucleation of Mg2Si on Si is favored due to reduction of nucleation barrier.
Article
Chemistry, Physical
Vickey Nandal, R. Sarvesha, Sudhanshu S. Singh, E-Wen Huang, Yao-Jen Chang, An-Chou Yeh, Suresh Neelakantan, Jayant Jain
Summary: The study investigated the effect of pre-deformation on aging response of non-equiatomic high entropy alloys, showing that pre-deformed HEAs exhibit reduced peak-aging time due to enhanced precipitation kinetics from increased dislocation densities. Microstructural analysis revealed distinct precipitate size and distribution characteristics in pre-deformed and aged alloys, providing insights into their role in aging response and coarsening kinetics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
J. X. Hou, J. Y. Zhang, J. X. Zhang, J. H. Luan, Y. X. Wang, B. X. Cao, Y. L. Zhao, Z. B. Jiao, X. J. Liu, W. W. Song, P. K. Liaw, T. Yang
Summary: The precipitation morphologies, coarsening kinetics, elemental partitioning behaviors, grain structures, and tensile properties of L12-strengthened Ni39.9Co20Fe15Cr15Al6Ti4-xNbxB0.1 (x = 0 at.%, 2 at.%, and 4 at.%) high-entropy alloys were investigated. Substituting Ti with Nb resulted in a transition from spheroidal to cuboidal precipitates, increased coarsening kinetics, and phase decomposition at 800°C. Excessive Nb addition led to grain boundary precipitation and phase decomposition from L12 to lamellar-structured D019 phase. Partial substitution of Ti with Nb resulted in a chemically complex and thermally stable L12 phase, ensuring stable phase structure and clean grain boundaries, leading to excellent high-temperature mechanical properties at 700°C.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
P. Salas, L. A. Diaz-Torres, L. Ojedac, J. Oliva
Summary: Bi2Ti2-xZrxO7:Er3+,Yb3+ phosphors were synthesized with different content of Zr by combusion method at 550°C, producing a mixture of Bi2Ti2O7/Bi4Ti3O12 phases. After increasing the synthesis temperature to 1000°C, a pure Bi2Ti2O7 phase was obtained as well as porous coalesced microparticles. The color emission of the phosphors can be tuned from green to yellow-red or vice versa by increasing the Zr content or synthesis temperature.
Article
Chemistry, Physical
Lipeng Ding, Lv Zhao, Yaoyao Weng, Dominique Schryvers, Qing Liu, Hosni Idrissi
Summary: The heterogeneous precipitation of the eta phase on the E dispersoids of the 7075 aluminum alloy was investigated, revealing that the B particles are heterogeneously precipitated at the E particle interface, stabilizing the E/Al interface and increasing the drive force of heterogeneous precipitation.
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)