Article
Chemistry, Physical
Jisung Yoo, Selim Kim, Min Cheol Jo, Hyungkwon Park, Joong Eun Jung, Jeonghyeon Do, Dae Won Yun, In Soo Kim, Baig-Gyu Choi
Summary: In this study, the hydrogen embrittlement behavior of heat-treated Alloy 718 fabricated by laser powder bed fusion was investigated. The results showed that hydrogen transitioned the fracture mode and promoted the formation of dislocation slip bands, leading to cracking regardless of the distribution of microstructural features.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Hongxu Cheng, Hong Luo, Zhimin Pan, Xuefei Wang, Qiancheng Zhao, Yu Fu, Xiaogang Li
Summary: This study investigated the hydrogen embrittlement behavior, micro-deformation, and crack propagation mechanism of LPBF CoCrFeNiMn HEA under different parameters. It was found that LPBF CoCrFeNiMn HEA exhibited excellent resistance to hydrogen embrittlement. Unsuitable LPBF parameters resulted in the formation of microcracks and holes, leading to a decrease in the hydrogen embrittlement resistance of the material. The effect of hydrogen on deformation mechanism and crack propagation was studied using EBSD, ECCI, and TEM techniques.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xuan Yang, Yuriy Yagodzinskyy, Yanling Ge, Eryang Lu, Joonas Lehtonen, Lauri Kollo, Simo-Pekka Hannula
Summary: The study found that the LPBF-produced CrFeNiMn alloy absorbed significantly more hydrogen than alloys produced using other sintering methods, including PECS CrFeNiMn alloy and conventional austenitic stainless steel. This is attributed to differences in the amount of hydrogen absorbed by the multi-component lattice, dislocation densities, width of segregation range, and vacancies in the rapid cooling process of LPBF. Additionally, analysis of the LPBF-transmission electron microscope specimen revealed stacking faults and cracks in the austenite, while scanning electron microscopy showed hydrogen-induced cracks and pits at grain boundaries.
Article
Chemistry, Physical
Dong-Hyun Lee, Jae Yeong Jung, Keun Hyung Lee, Soo Yeol Lee, Yakai Zhao, Kwang Boon Lau, Pei Wang, Upadrasta Ramamurty
Summary: This study investigated the hydrogen embrittlement behavior of CoCrFeNi high-entropy alloy (HEA) fabricated by laser-powder bed fusion (L-PBF) under ex-situ and in-situ hydrogen charging conditions. The ex-situ pre-charged sample showed resistance to hydrogen embrittlement, while in-situ hydrogen charging during tensile testing resulted in a loss in ductility and hydrogen-assisted cracking. The enhanced solubility and diffusivity at grain boundaries in the in-situ condition were attributed to this discrepancy. The study highlights the critical role of the synergy between mechanical and environmental conditions in the hydrogen embrittlement mechanisms of L-PBF HEA.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Julie Gheysen, Ankush Kashiwara, Hosni Idrissia, Julie Villanova, Aude Simar
Summary: This study proposes the design of a healable Al alloy to suppress hydrogen blistering and improve damage management in 4xxx series Al alloys. The addition of Mg in the alloy suppresses hydrogen blistering and enables significant healing of smaller voids. This research opens up possibilities for the development of new healable Al alloys and post-treatments without hydrogen blistering.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Erik Bhekti Yutomo, Fatimah Arofiati Noor, Toto Winata
Summary: The Ni atomic fraction in Cu-Ni alloy catalysts greatly affects the stability and activity of carbon source species, leading to different growth mechanisms of graphene. CH and C monomers play a dominant role in surface-mediated growth on Cu-Ni catalysts with low Ni atomic fractions, while the C monomer on the subsurface controls the cooling-induced segregation growth mechanism in Cu-Ni catalysts with high Ni atomic fractions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Wangping Wu, Guang He, Jiaqi Huang, Ao Zhang, Xiliang Liu, Zhong Ouyang, Zilong Sun, Li Guan, Song Chu, Peng Li, Peng Jiang, Yi Zhang
Summary: Ti-6Al-4V alloy parts obtained by L-PBF process were studied for their microstructure, phase identification, and mechanical properties after being electro-chemically charged with hydrogen. The results showed a unique dual-phase structure in the as-built alloy, while the as-charged parts exhibited a solid solution of hydrogen in alpha-phase, as well as hydride phases. Mechanical properties of the alloy were affected by the direction of deposition, with parts from the deposition direction showing higher resistance to hydrogen embrittlement. Furthermore, the as-charged parts experienced a significant increase in hydrogen content and a decrease in mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
J. Hesketh, N. McClelland, Y. Zhang, C. Green, A. Turnbull
Summary: The susceptibility to hydrogen embrittlement of additively manufactured and heat-treated Alloy 718 was compared to that of wrought Alloy 718. Testing revealed that specimens manufactured from horizontally printed coupons showed greater susceptibility to hydrogen embrittlement, potentially due to cracks propagating more readily along the elongated direction of the microstructure.
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
(2021)
Article
Energy & Fuels
Masahiko Okumura, Ayaka Ikado, Yasuhiro Saito, Yohsuke Matsushita, Hideyuki Aoki, Yoshiaki Kawakami
Summary: The study investigated the effect of cyclic hydrogen absorption/desorption on the stress developed on the side wall of a pressure vessel and the packing state of the alloy. It was found that as the number of cycles increased, the local packing fraction of the packed bed varied in different regions, affecting the stress distribution within the vessel.
JOURNAL OF THE JAPAN INSTITUTE OF ENERGY
(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)