Article
Engineering, Mechanical
Xing Song, Yun Jiang, Xiaoan Hu, Xiangfan Nie
Summary: This study investigated the thermomechanical fatigue behavior of a directional solidified superalloy. The results showed that fatigue, creep, and oxidation damage are the main mechanisms governing TMF damage, and stress concentration at holes leads to crack initiation and final failure. A new life prediction method for specimens with stress concentration is proposed, which incorporates stress gradient to account for the effect of stress concentration. The method is validated using TMF data from smooth, notched, and hole specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Jiaqi Lu, Huang Yuan
Summary: This study focuses on quantifying creep and oxidation effects to predict isothermal and thermomechanical fatigue life in a nickel-based superalloy. Creep damage was evaluated using the time-fraction method and the ductility-exhaustion method. A diffusion-dominated environmental damage parameter based on oxygen-assisted intergranular cracking mechanism was proposed and applied to thermomechanical fatigue life assessment. The results suggest that creep damage is negligible while environmental damage appears to be more dominant in this study. The proposed model provides a unified description for both isothermal and thermomechanical fatigue.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Weiwen Kong, Taojie Nian, Chao Yuan
Summary: The study investigates the low cycle fatigue and ratcheting fatigue behaviors of a nickel-based superalloy under various cyclic loading conditions at 650 degrees C. It is found that ratcheting strain increases with cycle numbers increasing, and the ratcheting strain rate curves exhibit three different stages. A fatigue life prediction model based on ratcheting strain rate is developed, which effectively predicts the fatigue life of the material.
Article
Nanoscience & Nanotechnology
Weiwen Kong, Yongqiang Wang, Yipeng Chen, Xin Liu, Chao Yuan
Summary: The study found that the fatigue life of GH742 superalloy is significantly affected by mean stress and stress amplitude. Tensile ratcheting strain increases with the number of cycles, and multiple fatigue cracks initiate from surface inclusions, crystallographic facets, and slip bands.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Frans Palmert, Per Almroth, David Gustafsson, Jordi Loureiro-Homs, Ashok Saxena, Johan Moverare
Summary: The influence of hold time on the crack growth behavior of a single crystal nickel base superalloy under in-phase thermomechanical fatigue was investigated. Two da/dt models, one based on K and the other on (C-t)(avg), were calibrated. Predictions based on (C-t)(avg) were accurate while predictions based on K were inaccurate and generally non-conservative. da/dt vs (C-t)(avg) followed a single trendline for all temperatures.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Cheng Luo, Huang Yuan
Summary: This study investigated the thermomechanical fatigue behavior of nickel-base single-crystal superalloy with different crystal orientations. The crack initiation modes and damage mechanisms were characterized using SEM and optical microscopy. In IP-TMF, creep damage originated from casting pores and propagated under mode I. The creep facets were influenced by activated slip systems, while fatigue damage depended on crystal orientation and developed by slipping along different crystallographic planes. In OP-TMF tests, oxidation-assisted cracking was non-crystallographic for all crystal orientations, with the crack growing within the oxidized material.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Kai-Shang Li, Run-Zi Wang, Lv-Yi Cheng, Ti-Wen Lu, Xian-Cheng Zhang, Shan-Tung Tu, Guo-Dong Zhang, Zhi-Chao Fan
Summary: In this study, a dislocation-based crystal plasticity finite element (CPFE) framework was used to investigate the effects of loading conditions on dwell-fatigue crack initiation life. A life prediction approach based on accumulated energy dissipation at half-life cycle was proposed, and a new three-dimensional damage tolerance diagram was introduced to evaluate the residual dwell fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Kai-Shang Li, Run-Zi Wang, Guang-Jian Yuan, Shun-Peng Zhu, Xian-Cheng Zhang, Shan-Tung Tu, Hideo Miura
Summary: In this study, a numerical method based on CPFE was implemented to predict creep-fatigue crack initiation life, and a new life prediction approach was constructed by introducing fatigue and creep indicator parameters. Experimental validation showed high accuracy of the predicted model, providing a potential methodology for conservative creep-fatigue life evaluation in engineering applications.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Junbin Yang, Yu Gong, Linfei Jiang, Wanjia Lin, Hao Liu
Summary: This work proposes a multiaxial and high-cycle fatigue failure model based on the critical plane criterion, which accurately predicts the fatigue failure behavior and fatigue life of structures or materials under multi-axial loading by considering the influences of material property and loading path on the initiation and growth of fatigue cracks. Experimental results of three kinds of material validate the model's applicability, with most predictions falling within the +/- 2 times scatter band of fatigue life.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Yang Wang, Guo-Qin Sun, Jinfeng Liu, Xiaodong Liu, Deguang Shang
Summary: A new multiaxial high-cycle fatigue damage parameter is proposed in this study, which can accurately predict the failure criterion and life prediction of structural components under complex low stress. The feasibility of the model is verified by test data of different materials, and the predicted results show smaller errors compared to other fatigue models.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2022)
Article
Engineering, Mechanical
Zhicheng Ge, Guang Xie, Mikael Segersall, Viktor Norman, Zhe Chen, Johan Moverare, Langhong Lou, Jian Zhang
Summary: The deformation mechanisms of a single crystal nickel-base superalloy with and without Ru-doped have been investigated under out-of-phase thermomechanical fatigue. It was found that the Ru-doped alloy exhibits a longer thermomechanical fatigue life and different deformation mechanisms compared to the Ru-free alloy.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Jean-Briac le Graverend
Summary: A phenomenological model is proposed to predict both monotonic and cyclic softening in Inconel 718 superalloy at 650℃. Crystal-plasticity finite-element simulations are performed to validate the model and gain insights on the ratcheting phenomenon.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Jundong Wang, Hao Lu, Zhixun Wen, Yeda Lian, Yingying Wang, Zhufeng Yue
Summary: Stress-controlled low cycle fatigue tests were conducted on a second-generation nickel-based single crystal superalloy DD6 with [001] orientation at different mean stresses. The results showed that although the phase structure remained unchanged for different conditions, the failure mode changed with different mean stresses. Ratcheting strain was found to depend significantly on mean stress and microstructure damage. A crystal plasticity constitutive model coupled with a new anisotropic damage was developed to accurately simulate the evolution of ratcheting strain for different mean stresses.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Mingwei Xie, Gang Chen
Summary: This study investigated the mechanical response of Sn-based lead-free SAC305 solder under thermomechanical cyclic loading, developed a crystal plasticity model for prediction, and analyzed the cyclic softening behavior of the solder.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Xinxin Qi, Tianqi Liu, Xinhong Shi, Jiaying Wang, Jianyu Zhang, Binjun Fei
Summary: A stress-based sectional critical plane model is proposed to predict fatigue life under multiaxial constant amplitude loading, considering material properties and loading paths. The model divides critical planes into three sections based on the ratio of maximum shear stress amplitude to maximum normal stress amplitude. Experimental data support the strong applicability of the model for steel, aluminum, and titanium alloy materials, especially under multiaxial loadings with mean stresses. Prediction results show that the proposed model performs better than commonly used criteria for steel materials.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(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)