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SSRN 2024年

作者： Hu, Yong Jia, Huibin Zhang, Xu Yang, Xiaokang Dong, Zhang School of Material Science and Engineering Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Gansu Jinchang737100 China

The design and development of heat treatment regimes adapted to the L-PBFed alloy for specific service conditions have become a hot topic of research in the field of AM. This paper systematically studies the microstructure changes of the L-PBFed IN738LC alloy, solution treatment at 1250 °C for various durations (1 h, 3 h, 5 h), then aging at 850 °C for 24 h, using XRD, EBSD, SEM, STEM and EDS. The analysis focuses on the delayed recrystallization behavior of the alloy and discusses the selective precipitation rule of the M23C6 carbide on different types of grain boundaries during recrystallization. Additionally, the tensile deformation mechanism of the alloy before and after heat treatment is clarified. The results show that due to the pinning of carbide particles and the segregation of solute atoms, the migration and transformation of grain boundaries under the condition of 1250 °C/1 h are hindered during the initial stage of solid solution treatment, which accounts for the delayed recrystallization behavior, and the microstructure is mainly experiencing recovery. At 1250 °C/5 h, M23C6 carbides selectively precipitate at twin boundaries, accompanied by recrystallization. The samples treated at 1250 °C/1 h exhibit the highest yield strength (σYS=1305±21 MPa) and tensile strength (σUTS=1462±11 MPa) owing to the precipitation of γ′ phase. Moreover, the presence of sub-grain boundaries provides some plasticity (ΕEL=5.4±0.7%). The deformation mechanism shows that the as-built samples mainly experience planar dislocations slipping, while the heat-treated samples undergo stacking faults (SFs) shearing and anti-phase boundaries (APB) shearing. The dominant mechanism among these is APB shearing. © 2024, The Authors. All rights reserved.

关键词： Recrystallization (metallurgy)

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Synergistic Enhancement of Hot Corrosion Resistance and Mechanical Properties of In738lc Alloy Prepared by Selective Laser Melting

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SSRN 2024年

作者： Hu, Yong Jia, Huibin Zhang, Xu Yang, Xiaokang Liu, Bo Xu, Jiayu Gao, Yubi Ding, Yutian Zhang, Dong School of Material Science and Engineering Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Gansu Jinchang737100 China

In this study, the synergistic enhancement of hot corrosion resistance (900 °C, 75%Na2SO4+25%NaCl) and mechanical properties of IN738LC alloy prepared by SLM with various solution heat treatments followed by aging treatment are investigated. The results indicate that compared with as-built samples and ST1+AT samples, the M23C6 precipitation at the grain boundaries coupled with smaller γ′ phase distribution in the inner grain are conducive to the formation of thicker Cr2O3 outer layer and Al2O3 inner layer for the ST2+AT samples, which effectively hinder the diffusion of S and Cl elements penetrate to the matrix, enhancing the hot corrosion resistance. The ST2+AT samples (i.e. treated at super solid solution heat treatment) exhibit excellent mechanical properties of σYS = 1261 MPa, σUTS = 1360 MPa, σEL = 3.4% attributed to the small-sized γ′ phase and the re crystallization-induced grain refinement, which increased the yield strength of the alloy. © 2024, The Authors. All rights reserved.

关键词： Heat treatment

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Dynamic response of B4C, TiB2 and TiB2-B4C under shock wave compression

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Ceramics International 2025年

作者： Shu, Zaiqin Jing, Qiang Wan, Mingming Zhang, Jinyong School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China State Key laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Inner Mongolian Metal Materials Research Institute Yantai264003 China

TiB2-B4C (TBC) has been widely utilized in lightweight armor due to its exceptional mechanical properties. The Hugoniot elastic limit (HEL) has been considered as an important dynamic property of ceramics. This paper presents the shock responses of pure B4C, pure TiB2, and TiB2-B4C composite. By microstructure analysis, the amorphization in B4C and dislocations in TiB2 at shock pressures around 37 GPa in the recycled debris were observed. The dislocations in TiB2 are believed to be the reason for ‘two HELs’ in TiB2. The addition of TiB2 has little effect on the shock properties of B4C, while the shock pressure exceeds HEL. Additionally, a failure wave was detected in the ceramics at shock pressures lower than HEL. A damage parameter was defined to quantify the extent of damage in the failure zone. The incorporation of TiB2 into B4C can significantly slow down failure propagation in TBC at pressure lower than HEL. Furthermore, the analysis of the damage parameter suggests that TBC exhibits superior impact resistance compared to pure B4C and TiB2. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Amorphization

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Tailoring nanoprecipitates for ultra-strong high-entropy alloys via machine learning and prestrain aging

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Journal of materials Science & Technology 2021年第10期69卷 156-167页

作者： Tao Zheng Xiaobing Hu Feng He Qjngfeng Wu Bin Han Chen Da Junjie Li Zhijun Wang Jincheng Wang Ji-jung Kai Zhenhai Xia C.T.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Institute of Atomic and Molecular Science.Shaanxi University of Science and Technology Xi'an710021China Department of Material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina Department of Materials Science and Engineering University of North TexasDentonTXUSA Center for Advanced Structural Materials Department of Mechanical EngineeringCollege of Science and EngineeringCity University of Hong KongHong KongChina

The multi-principal-component concept of high-entropy alloys(HEAs) generates numerous new *** them,nanoscale precipitated HEAs have achieved superior mechanical properties and shown the potentials for structural ***,it is still a great challe nge to find the optimal alloy within the numerous *** to now,the reported nanoprecipitated HEAs are mainly designed by a trialand-error approach with the aid of phase diagram calculations,limiting the development of structural *** the current work,a novel method is proposed to accelerate the development of ultra-strong nanoprecipitated *** the guidance of physical metallurgy,the volume fraction of the required nanoprecipitates is designed from a machine learning of big data with thermodynamic foundation while the morphology of precipitates is kinetically tailored by prestrain *** a proof-of-principle study,an HEA with superior strength and ductility has been designed and systematically *** newly developed γ’-strengthened HEA exhibits 1.31 GPa yield strength,1.65 GPa ultimate tensile strength,and 15% tensile *** probe tomography and transmission electron microscope characterizations reveal the well-controlled high γ’ volume fraction(52%) and refined precipitate size(19 nm).The refinement of nanoprecipitates originates from the accelerated nucleation of the γ’ phase by prestrain aging.A deeper understanding of the excellent mechanical properties is illustrated from the aspect of strengthening mecha ***,the versatility of the current design strategy to other precipitation-hardened alloys is discussed.

关键词： High-entropy alloys Machine learning Prestrain aging Mechanical properties Strengthening mechanisms

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Defect Evolution and Effect on Structure and Electric Properties of A/B Site Sm Doped Batio3 Sintered in Different Atmospheres

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SSRN 2022年

作者： Wang, Zhen Hao, Hua Peng, Feng Zhang, Wanying Su, Cong Guo, Qinghu Yao, Zhonghua Cao, Minghe Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Center for Smart Materials and Device Integration

BaTiO3 ceramics doped with different contents of Sm (0.5-7 mol%) are prepared by a homogeneous precipitation method and sintered in air (A-xSm) and reducing (R-xSm) atmosphere respectively. With the increase of doping amount, the phase structure of Sm-doped BaTiO3 ceramics gradually changes from tetragonal phase to cubic phase, and the cubic phase is stronger in R-xSm. In the air atmosphere, Sm ions preferentially replace Ba sites as donors at low doping concentration, which is easy to convert Ti4+ ions into Ti3+ ions, resulting high dielectric constant (>104) and semiconductor like properties. As the doping amount increases, Sm ions start to replace Ti sites as acceptors to generate oxygen vacancies, which capture the electrons generated by donor doping, thus decreasing the percentage of Ti3+ ions. As a result, the dielectric loss and permittivity are decreased, and the electrical insulation properties of A-xSm ceramics are gradually improved. However, in the reducing atmosphere, oxygen atoms in the lattice are easy to escape, resulting in many oxygen vacancies and free electrons. The increase of oxygen vacancy inhibits the substitution of Sm ion to Ti site, and the free electron leads to the increase the percentage of Ti3+ ions and R-xSm ceramics exhibit semiconductor like properties. Thermally stimulated depolarization currents (TSDC) testing verified that oxygen vacancies of A-xSm ceramics mainly capture space charges, and a small part of oxygen vacancies form defective dipoles. The complex impedance test shows that the change of resistivity of A-xSm ceramics is mainly closed to the influence of Sm doping on the grain not grain boundary of BaTiO3 ceramic. © 2022, The Authors. All rights reserved.

关键词： Oxygen vacancies

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High-flux and anti-salt solar desalination via scalable photothermal textiles with vertically confined water layers

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Device 2025年

作者： Zhang, Qian Wang, Manyu Yu, Hao Xu, Ning Xiao, Xingfang Pan, Luqi Zhu, Jia Xu, Weilin State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 China National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials Frontiers Science Center for Critical Earth Material Cycling Nanjing University Nanjing China

Interfacial solar evaporation plays a crucial role in desalination because of its sustainable, eco-friendly characteristics. However, major challenges to simultaneously achieving salt rejection, fast evaporation, and heat localization in solar desalination devices still remain. We propose a photothermal textile with vertically confined water layers for scalable, high-flux, long-term-reliable solar desalination. The photothermal textile consists of outer layers (carbon fibers) for solar absorption and core layers (hollow yarns) for water-feeding channels. Three-dimensional evaporators possess large evaporation areas and, thus, high evaporation rates, and the vertically confined water layers in the hollow yarns enable natural convection for effective salt rejection with negligible heat loss. Consequently, this photothermal textile achieves an evaporation rate of 2.05 kg m⁻² h⁻¹ in high-salinity brine (15 wt % NaCl solution) under 1-sun irradiation, with long-term reliability of over 20 days in continuous outdoor operation. © 2025 The Author(s)

关键词： DTI-2: Explore high flux photothermal textile salt rejection solar desalination vertically confined water layer

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Preface to Special Issue for 2nd Chinese Symposium on Photocatalytic materials (CSPM2)

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Chinese Journal of Catalysis 2021年第1期42卷 1-2页

作者： Jiaguo Yu Zhaosheng Li Shifu Chen State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyChina College of Engineering and Applied Sciences Nanjing UniversityChina Key Laboratory of Clean Energy and Green Circulation Huaibei Normal UniversityChina

With the ever-increasing consumption of fossil fuels and the increment in environmental pollution problems,developing sustainable and renewable energy sources and environmentally friendly purification methods has become an appeal investigation all over the *** can provide promising solutions to these issues,by utilizing solar light to reduce CO2 into hydrocarbon fuels,to split water into hydrogen and to mineralize organic pollutants into inorganic ***,a huge obstacle to the application of this technology is its low photocatalytic *** improvement on the performance of photocatalytic materials is urgently ***,this investigation topic was within the scope of The 2nd Chinese Symposium on Photocatalytic materials(CSPM2)held at Nanjing Jinling Riverside Hotel,Nanjing,China on November 8-11,*** conference was organized by Nanjing University,Huaibei Normal University,Changsha University,Fuzhou University and Wuhan universityof Technology,and supported by National Natural Science Foundation of China(NSFC),Nanjing University,Huaibei Normal University,Changsha University,Wuhan University of Technology,Beijing Perfectlight and *** are more than 420 experts and students attending this symposium,and 12 plenary lectures,17 keynote lectures,9 invited lectures,12 oral lectures and 115 posters ***,18 excellent posters were selected.

关键词： utilizing Nanjing increment

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The Effect of Pre-Strain on Textures, Nano-Twins and Mechanical Properties of a Novel Nickel-Based Superalloy Gh4251 with Low Stacking Fault Energy

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SSRN 2024年

作者： Dong, Jinxin Yu, Hongyao Cao, Rui Wang, Xingmao Wang, Jue Bi, Zhongnan State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research Institute Beijing100081 China Gaona Aero Material Co. Ltd. Beijing100081 China School of Materials Science and Engineering Nanjing Institute of Technology Nanjing211167 China

The strength and plasticity of a novel polycrystalline low stacking fault energy precipitation-strengthened Nickel-based superalloy at 750°C can be enhanced by appropriate cold rolling pre-deformation. The findings indicate that such pre-deformation leads to the emergence of microscopic substructures, including dislocations, anti-phase boundaries (APBs), stacking faults, and Lomer-Cottrell Locks (L-C locks). The presence of these substructures was observed to increase with the degree of pre-deformation. At a pre-deformation level of 15%, only a few deformation twins were detected near the grain boundaries, with their occurrence rising further in specimens subjected to 25% pre-deformation. Additionally, the formation of nano-twins showed a strong correlation with the intensification of Copper Twin (CuT) and Brass-type textures. Notably, the yield strength of the superalloy at 750°C increased with the augmentation of cold rolling pre-deformation within the range of 5% to 15%. Interestingly, the yield strength of the specimen with 25% pre-deformation was slightly lower than that of the 15% pre-deformation specimen but higher than that of specimens without pre-deformation and those with 5% pre-deformation. Tensile strength continued to rise with increased cold rolling pre-deformation. The specimen with 15% pre-deformation displayed the lowest plasticity. Attributed to factors such as low recovery and recrystallization activation energy, high-density nano-twins, grain refinement, and conducive crystallographic orientation for nano-twin mechanism activation caused by cold rolling pre-deformation, the specimen with 25% pre-deformation exhibited relatively high ductility at 750°C. This study comprehensively explores the relationship between pre-cold rolling deformation, microstructure, texture, and mechanical properties, indicating that cold rolling pre-deformation holds promise for enhancing both the strength and plasticity of Nickel-based superalloys. © 2024, The Authors.

关键词： Textures

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Effect of Laser Power on Microstructure and Mechanical Properties of K418 Nickel-Based Alloy Prepared by Selective Laser Melting

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SSRN 2023年

作者： Lu, Yongxin Zhou, Yuwei Wen, Pengjun Luo, Fan Cao, Jian Xu, Youwei Wang, Shiqing Li, Xiao Zhang, Xiaoyong Li, Wenya School of Material Science and Engineering Xi'an Shiyou University Xi'An710065 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China School of Materials Science and Engineering Northwestern Polytechnical University Xi'An710072 China State Key Laboratory of Advanced Processing and Recycling of NonFerrous Metals Lanzhou University of Technology Lanzhou730050 China

K418 alloy was prepared by selective laser melting (SLM) at different laser powers (160~240W) in this paper. And the influence of laser power on the densification behavior, microstructure, microhardness, and tensile properties were studied systematically. The results showed that the densities of the material increased rapidly first and then decreased slowly with the increase of laser power. When the laser power increased from 160W to 240W, the surface defects of the specimen decreased, the microstructure changed from columnar dendrites to cellular, and the grains grew in the direction preferentially. When the laser power is 200W, the grain size is the smallest, the content of small-angle grain boundaries is more, the Schmidt factor is less, and then the best mechanical properties are achieved, at which the microhardness reaches 362.89±5.01 HV, the tensile strength reaches 1244.35±70.1 MPa, the yield strength reaches 863.89±23.1 MPa, and the elongation of the material reaches a maximum of 12.53±0.71%. In addition, the fracture mode of the material is a mixed tough-brittle fracture mechanism. © 2023, The Authors. All rights reserved.

关键词： Selective laser melting

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Hydrogen Trapping and Embrittlement Behavior in a Second-Generation Ni-Based Single Crystal Superalloy

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SSRN 2024年

作者： Lu, Guangxian Zhao, Yunsong Zhao, Tingting Chen, Yanhui Wang, William Yi Wen, Zhixun State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'An710072 China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'An710072 China Institute of Microstructure Property of Advanced Materials Beijing University of Technology Beijing100124 China National Key Laboratory of Science and Technology on Advanced High Temperature Structural Material China

The present study explores the hydrogen trapping capability and hydrogen embrittlement (HE) behaviors of a second-generation single crystal (SX) superalloy. The susceptibility of HE improves with the increased hydrogen charging duration. Hydrogen induces more cleavages, micro-cracks and denser slip traces. Hydrogen facilitates the formation of nano-voids and the activation of high-density dislocations, leading to denser slip bands which are initiation sites of micro-cracks. Hydrogen is prone to be solutioned in the γ matrix and reversibly trapped at the γ/γ' interface. The First-principles calculations indicate that hydrogen reduces the binding strength at the γ/γ' interface, which promotes the propagation of micro-cracks. © 2024, The Authors. All rights reserved.

关键词： Hydrogen

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