Article
Materials Science, Multidisciplinary
R. Seetharam, Pagidi Madhukar, G. Yoganjaneyulu, S. Kanmani Subbu, M. J. Davidson
Summary: Mathematical models are employed to study the hot deformation behavior and microstructure alteration of a new AA7150-5 wt% B4C composite. The developed constitutive and dynamically recrystallized grain models accurately predict the flow stress and grain size under different deformation conditions. The models are reliable for forecasting the properties of the AA7150-5 wt% B4C composite under various conditions.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xiao Lei, He Yingjie, Ma Xiangdong, Qiu Chuanrong, Yang Jinlong, Guo Jianzheng
Summary: This study conducted a series of hot extrusion tests on a novel powder metallurgy superalloy WZ-A3 to investigate the effects of extrusion temperature, speed, and ratio on the microstructure and uniformity of the extruded bar. The results revealed that under certain conditions, dynamic recrystallization occurred with grain coarsening. Moreover, the study found significant influences of extrusion temperature, speed, and ratio on the grain size and uniformity of the bar.
RARE METAL MATERIALS AND ENGINEERING
(2022)
Article
Materials Science, Ceramics
Benkai Li, Jingfei Yin, Yejun Zhu, Xi Zhang, Wenfeng Ding
Summary: The study investigated the grain wear evolution during grinding powder metallurgy superalloy FGH96 using a single abrasive grain of cubic boron nitride (CBN) under different conditions. The wear behavior was extracted based on various features such as grinding force, radial wear, grain topography, and material remove characteristics. Acoustic emission testing was applied to analyze the grain wear evolution.
CERAMICS INTERNATIONAL
(2021)
Article
Metallurgy & Metallurgical Engineering
Yan-hui Liu, Zhao-zhao Liu, Miao Wang
Summary: The isothermal compression test was conducted on a powder metallurgy superalloy to study the effect of strain rate and deformation temperature on grain shape and size during thermal deformation. It was found that exquisite and equiaxed dynamic recrystallization grains are obtained at high deformation temperature and strain rate due to the high dislocation density. The interaction between high DRX nucleation rate and low grain growth rate at high strain rate favors the formation of finer DRX grains. The aspect ratio of grains has important implications for DRX and grain growth process, with higher aspect ratio observed at higher deformation temperature.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
R. Seetharam, S. Kanmani Subbu, M. J. Davidson, K. R. Ramkumar, Pagidi Madhukar
Summary: The grain size of materials can be significantly reduced by dynamic recrystallization (DRX), which improves the properties and performance of the materials. The addition of reinforcement to the matrix in composite materials affects the DRX behavior. Different compositions of sintered composites exhibit different fracture modes. DRX models were developed to predict grain size, and they were validated.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Yuanyuan Zhang, Jikang Li, You Wu, Qingshuai Feng, Jiantao Liu, Tong Liu
Summary: The effects of solution treatment temperature on the microstructure of a nickel-based powder metallurgy superalloy were studied. The grain growth of the gamma matrix was influenced by the pinning of the primary gamma ' phase and the size of carbides. The grain growth model was established, and the activation energy of grain growth was calculated. The dissolution of primary gamma ' precipitates and the increase in size of secondary gamma ' precipitates with solution temperature were observed. The hardness variation of the samples was mainly affected by the combined effects of grain size and the size of gamma ' precipitates.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Qiu-Mei Yang, Yong-Cheng Lin, Guan Liu, Ming-Song Chen, Yu-Liang Qiu
Summary: The rheological behavior and deformation mechanisms of a new powder metallurgy (P/M) superalloy were investigated under different deformation conditions. It was found that the rheological stress can be reduced by increasing the deformation temperature or decreasing the strain rate. The deformation mechanisms of the superalloy include dislocation accumulation, stacking faults shearing, dislocations pinned by gamma ' phase, and the formation of microtwins during hot deformation. A particle swarm optimization-based backpropagation artificial neural network (PSO-BP ANN) model was developed to accurately predict the rheological behavior of the alloy.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Qinzheng Yang, Xiaoguang Yang, Weiqing Huang, Yi Shi, Duoqi Shi
Summary: The study investigates the influence of stress ratio and local microstructure on small crack propagation in a superalloy using the Photomicroscopy method. The results show that crack growth rates are correlated with the stress ratio, and grain boundaries can temporarily arrest crack propagation.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Chengtao Yu, Qunchang Wang, Minghui Chen, Fuhui Wang
Summary: FGH 97 alloy and its composite with TiC addition were prepared by spark plasma sintering. TiC particles were dissolved into the alloy matrix during ball milling, but precipitated out in-situ as MC solid solution with semi-coherent interface after sintering, resulting in a homogeneous and fine microstructure. After exposure to 900 degrees C for 300 h, the grain size only grew by 31%. The fine microstructure promoted selective oxidation of Al and ensured high oxidation resistance of the composite FT. The precipitated carbides increased oxidation resistance of FT and endowed its oxide scale with self-healing ability for long-term oxidation.
Article
Materials Science, Multidisciplinary
J. M. Mendoza-Duarte, F. C. Robles-Hernandez, E. Rocha-Rangel, Y. Todaka, N. Adachi, I Estrada-Guel, C. G. Garay-Reyes, M. A. Ruiz Esparza-Rodriguez, R. Martinez-Sanchez
Summary: Induction heating can be used to produce highly densified samples with increased hardness and yield strength. The mechanical response can be attributed to two main reinforcement mechanisms: dislocations obstruction and grain refinement.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Chemistry, Physical
Yunfei Cai, Yuanyuan Zhang, Jikang Li, Mingsheng Yang, Jiantao Liu, Tong Liu
Summary: The slow-cooling treatment can induce the formation of serrated grain boundaries, effectively enhancing the creep strength of nickel-based powder superalloys. However, this treatment also leads to the coarsening of gamma ' precipitates, which impairs their dispersion-strengthening effects. To address this issue, a high-temperature pre-precipitation treatment (HTPT) was employed to simultaneously form fine gamma ' precipitates and serrated grain boundaries. The investigation showed that decreasing the HTPT intermediate temperature resulted in an increase in the volume fraction of secondary gamma ' and a decrease in the average size of spherical tertiary gamma ' precipitates. Serrated grain boundaries were observed in samples with HTPT temperature below a certain temperature. The sample subjected to an HTPT temperature of 1130 degrees C showed the best mechanical properties at room temperature, while the 1140 degrees C sample exhibited superior performance at 750 degrees C.
Article
Chemistry, Physical
Jin Yang, Jiao Luo, Xiangyang Li, Miaoquan Li
Summary: This study investigates the correlation between microstructure and deformation-solution parameters of GH4586 superalloy through isothermal compression, solution treatment, EBSD, and TEM observations. It clearly illustrates the mechanisms of recrystallization, twin evolution, gamma' precipitation, and their interaction. The results show that the processes of dynamic and static recrystallization are controlled by different mechanisms, and the evolution of twin boundaries during deformation is influenced by losing twin's identity and nucleation of new twins. Fine gamma' precipitates hinder recrystallization but also have a noticeable influence on the formation of new twins.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
Etienne Martin, Arunkumar Natarajan, Srikanth Kottilingam, Rasim Batmaz
Summary: This study examines the advantages and disadvantages of using BJAM to produce high gamma' Ni-based superalloys. During the sintering process, the formation of HfO2 and Ta-rich carbides along prior particle boundaries was observed, impacting the mechanical properties of the material.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Xiao Lei, Cui Jinyan, Wang Chong, Ma Xiangdong, Xiong Jiangying, Long Anping, Yang Jinlong, Guo Jianzheng
Summary: By conducting Gleeble simulation tests and analyzing the grain size and microstructure evolution, it was found that the WZ-A3 alloy could obtain a uniform fine grain with a γ+γ' microduplex structure under certain compression conditions, without abnormal grain growth or necklace grains.
RARE METAL MATERIALS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Chao Li, Jianwei Teng, Biaobiao Yang, Xianjue Ye, Jiantao Liu, Yunping Li
Summary: The novel Co-Ni-based superalloy manufactured by powder metallurgy process exhibited higher mechanical properties compared to the corresponding casting alloy, mainly due to the higher contribution from grain boundary and precipitation strengthening.
MATERIALS CHARACTERIZATION
(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)