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Effect of different metal-reinforcement phases on PEO discharge and coating growth behavior of AZ91 Mg-matrix composites

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Journal of Magnesium and Alloys 2025年

作者： Jiao, Jinchao Gu, Yongrui Ding, Xiaoyun Zhang, Jin Lian, Yong Gao, Pengfei Zhang, Xiaohui Han, Shengli Zheng, Kaihong Pan, Fusheng Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 404100 China

The strength and ductility of Mg alloys were improved through the introduction of metallic reinforcement phases. How the effect of different metal-reinforcement phases on the PEO discharge and coating growth behavior of Mg-matrix composites remains unclear. In this work, the influence of three metal-reinforcement phases (Nb, Mn, and Cu) on voltage evolution, coating morphology, coating phase composition, and corrosion resistance was investigated. The results indicate that Nb-reinforcement undergoes continuous spark discharges, resulting in the formation of a "volcano-like" localized morphology. In contrast, Mn and Cu-reinforcements do not directly participate in PEO discharges;instead, their oxidation products form "nodule-like" protrusions that limit the voltage rise rate. These behaviors are attributed to differences in the properties of the oxidation products of metal reinforcements and the Mg matrix, such as stability, Pilling–Bedworth ratio (PBR), band gap, dielectric constant, and conductivity. These characteristics influence the electrical structure of the PEO coating, thereby altering the PEO discharge and coating growth behavior of the composites. Finally, two models are proposed to describe the PEO discharge mechanisms in the two types of metal-reinforced AZ91-based composites. © 2025

关键词： Corrosion resistance

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Hydrogen Trapping and Embrittlement 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 National Key Laboratory of Science and Technology on Advanced High Temperature Structural Material Beijing Institute of Aeronautical Materials Beijing100095 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'An710072 China Institute of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing100124 China

This study explores the hydrogen trapping capability and hydrogen embrittlement (HE) of a second-generation single crystal (SX) superalloy. Embrittlement susceptibility is greater as the duration of hydrogen charging is extended. The presence of hydrogen induces cleavage, micro-crack formation and denser slip traces. Moreover, hydrogen facilitates the formation of nano-voids and the activation of high-density dislocations, leading to denser slip bands which serve as initiation sites for micro-cracks. In addition, hydrogen is soluble in the γ matrix and is reversibly trapped at the γ/γ' interface. First-principles calculations have indicated 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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Enhancing Corrosion Resistance of Metallic surfaces with Hydrophobic H-BN Nanosheets

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SSRN 2024年

作者： Cheng, Ming Li, Wen Dun, Yuchao Chang, Wei Liu, Zeyu Wei, Qi Li, Shaojie Zhang, Xiaochen Nan, Yang Jin, Lei Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Technology Institute Beijing100024 China Technology Research Center Liyang Aero Power Co. LTD. AECC Guiyang550014 China

The relentless attack of corrosion on metallic surfaces is a pervasive issue that compromises the structural integrity and operational efficiency of materials in numerous industrial applications. This research aims to enhance the corrosion resistance of metallic surfaces through the application of hydrophobic hexagonal boron nitride (h-BN) nanosheets. The primary objectives of this research are to synthesize hydrophobic h-BN nanosheets (BNNS) and to evaluate the efficacy in providing corrosion protection to a variety of metallic substrates. By utilizing a mechanical exfoliation technique, the BNNS were derived from bulk h-BN, followed by a surface modification process to confer hydrophobicity. The synthesized BNNS underwent comprehensive characterization using an array of analytical tools to comprehensively assess the attributes of hydrophobic BNNS in enhancing the corrosion resistance of metallic surfaces. The corrosion resistance of metallic substrates was assessed by applying the BNNS-based coatings and subjecting them to a series of electrochemical tests and salt spray testing. The key findings of this research demonstrate a marked improvement in the corrosion resistance of metallic surfaces post-coating with hydrophobic BNNS. The hydrophobic nature of the BNNS exhibited a significant increase in hydrophobicity post-coating. Electrochemical tests revealed a positive shift in the corrosion potential and a reduction in the corrosion current density, signifying a diminished corrosion rate. By reducing the interaction between water and metal, the BNNS coatings act as a physical barrier, thereby hindering the electrochemical processes that precipitate corrosion. This study offers valuable insights into the development of advanced nanomaterial-based coatings for corrosion protection, with potential applications across various sectors, including aerospace, automotive, and civil infrastructure. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance

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Probing the Formation Mechanism of Hierarchical Microstructures in a Ni-Based Superalloy

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SSRN 2024年

作者： Hou, Bolong Yu, Suyang Shi, Rongpei AECC Beijing Institute of Aeronautical Materials Beijing100095 China Key Laboratory of Advanced High-temperature Structural Materials AECC Beijing Institute of Aeronautical Materials Beijing100095 China College of Materials Science and Engineering Institute of Materials Genome and Big Data Harbin Institute of Technology Shenzhen518055 China

Hierachical microstructures, consisting of a γ matrix with γ’ precipitates that contain embeded finer-scale γ precipitate, have been found to possess improved strength and enhanced coarsening resistance of ordered γ’ precipitates in several nickel superalloys. There is, however, a lacking understanding of the origin and thus design principles of such a hierarchical microstructure. Herein, we empoly a combined experimental and computational thermodynamic and kinetic modeling approach to explore the formation mechanism of the hierarchical microstructure in an experimental, multi-component nickel-base superalloy. Chemical mapping via atom probe tomograph togeter with nucleation driving force calculations suggest that the enrichment of Co, Cr along with the depletion of Al in the γ’ phase drives its phase separation, leading to the formation of this hierarchical microstructure. The alloy and heat treatment strategies discussed here may enable an effective design of a hierarchical γ/γ’/γ microstructure. © 2024, The Authors. All rights reserved.

关键词： Phase separation

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Microstructure and Properties of (Diamond + Tic) Reinforced Ti6al4v Titanium Matrix Composites Manufactured by Directed Energy Deposition

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SSRN 2023年

作者： Wang, Jiandong Tang, Lang Xue, Yu Zhao, Ziang Ye, Zhijie Cao, Wenxin Zhu, Jiaqi Jiang, Fengchun Key Laboratory of Superlight Materials & Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China National Key Laboratory of Science and Technology Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Yantai Graduate School of Harbin Engineering University Yantai264006 China

In this study, (diamond + TiC) reinforced Ti6Al4V titanium matrix composites (DT-TMCs) are fabricated using the directed energy deposition (DED) technique to enhance the hardness, wear resistance, and thermal conductivity of the Ti6Al4V alloy. The phase composition, microstructure, microhardness, wear resistance, and thermal conductivity of the composites are investigated. The findings demonstrate that the DT-TMCs consist of diamond, in-situ formed TiC (including eutectic TiC and primary TiC), α-Ti and β-Ti. The formation of in-situ TiC is attributed to the partial dissolution of the diamond into the Ti6Al4V matrix during directed energy deposition. The superior hardness of in-situ TiC, compared to that of Ti6Al4V alloy, plays a pivotal role in enhancing the overall hardness of the DT-TMCs. Owing to the high hardness and excellent thermal conductivity of diamond, the wear resistance and thermal conductivity of the DT-TMCs are superior to those of the unmodified Ti6Al4V alloy. With an increase in diamond volume fraction from 0% to 15%, the microhardness of the DT-TMCs raises from 333.99 HV0.2 to 438.15 HV0.2, while the wear rate decreases from 207.514 × 10-5 mm³·N-1m-1 to 2.256 × 10-5 mm³·N-1m-1 and thermal conductivity increases from 6.686 W·m-1·K-1 to 13.613 W·m-1·K-1. Additionally, the in-situ TiC exhibits superior thermal conductivity compared to the Ti6Al4V alloy, which also contributes to the improved thermal conductivity of the DT-TMCs. © 2023, The Authors. All rights reserved.

关键词： Wear resistance

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Explainable Machine-Learning Optimization of H-Bn Nanosheets with surface Defects for Enhanced Hydrophobicity

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SSRN 2024年

作者： Cheng, Ming Li, Wen Wei, Qi Dun, Yuchao Chang, Wei Liu, Zeyu Jin, Lei Wei, Guoke Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Technology Institute Beijing100024 China Technology Research Center Liyang Aero Power Co. LTD. AECC Guiyang550014 China

Metal corrosion incurs substantial economic and safety costs in industry, necessitating effective protective materials. Hexagonal boron nitride (h-BN) nanosheets, with their chemical stability and hydrophobicity, are an ideal choice for metal surface protection. However, optimizing their hydrophobic properties remains challenging. This study introduces an explainable AI-driven machine learning model to explore the impact of synthesis variables like temperature, heating time, and additive ratio on h-BN nanosheets' hydrophobicity. The model, with 82% accuracy, identified key variables and their nonlinear relationships, optimizing the nanosheets' hydrophobicity. By evaluating 687,500 conditions, AI-selected strategies significantly enhanced hydrophobicity, verified experimentally. This research underscores AI's potential in materials science, offering a new approach to developing advanced metal protective materials with theoretical and practical implications. © 2024, The Authors. All rights reserved.

关键词： Hydrophobicity

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Explainable Machine-Learning Optimization of H-BN Nanosheets with surface Defects for Enhanced Hydrophobicity

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SSRN 2024年

关键词： Boron nitride

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Effect of preparation method on electric and thermal transport of AgSbTe2

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Journal of Materials Science: Materials in Electronics 2025年第18期36卷 1-12页

作者： Shi, Mingpeng Cai, Fanggong Yuan, Yonglin Tang, Yuan Gao, Pei Lei, Xiaobo Sui, Youpeng Zhang, Qinyong Key Laboratory of Materials and Surface Technology (Ministry of Education) School of Materials Science and Engineering Xihua University Chengdu China Equipment Intelligent Welding Engineering Research Center School of Materials Science and Engineering Sichuan Energy Xihua University Chengdu China Laboratory of Advanced Energetic Materials and Devices School of Materials Science and Engineering Xihua University Chengdu China Huading Guolian Sichuan Power Battery Co. Ltd Chengdu China

AgSbTe2 is a typical thermoelectric material. Due to its low thermal conductivity, thermoelectric materials have been widely concerned by researchers. The preparation method of the material has a great influence on the thermoelectric properties of the material. This study investigates the effects of preparation methods (melting-quenching, MQ, ball milling, BM) and hot-pressing temperatures (350–450 °C) on the thermoelectric properties of AgSbTe2. Powder materials synthesized via MQ and BM were consolidated into bulk samples using DC hot-pressing. Results revealed that MQ-derived samples exhibited fewer impurities (e.g. Ag₂Te) compared to BM-derived counterparts, attributed to insufficient energy during ball milling. Increasing hot-pressing temperature enhanced crystallinity and reduced impurity phases, with MQ-450 (450 °C) achieving the highest phase purity. Thermoelectric performance analysis demonstrated that MQ-450 exhibited optimal electrical properties, with a Seebeck coefficient of 235 μV·K⁻1 at 300 K and a power factor (PF) of 13.16 μW·cm⁻1·K⁻2 at 600 K. Simultaneously, its total thermal conductivity decreased to 0.40 W·m⁻1·K⁻1 at 500 K due to suppressed lattice thermal conductivity (0.20–0.46 W·m⁻1·K⁻1). The synergistic optimization of electrical and thermal transport properties yielded a maximum dimensionless figure of merit (ZT) of 1.67 at 600 K for MQ-450, outperforming existing AgSbTe2-based materials prepared via similar methods. This work highlights the critical role of preparation techniques and processing temperatures in tailoring thermoelectric performance, providing insights for designing high-efficiency thermoelectric materials.

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Superior Solar Water Purification Achieved by the Excellent Photothermal Conversion and Thermal Management of Porous Plasmonic Tin Nanoparticles

SSRN

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SSRN 2023年

作者： Gao, Yaping Zhou, Xiaojie Fu, Nuo Su, Sihua Ma, Baopeng Ruan, Qifeng Wu, Di Zhang, Nan Deng, Ziwei Jiang, Ruibin Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen518055 China

Solar photothermal steam generation promises decentralized water purification, but the lack of materials that have strong sunlight absorption in wide spectral range, superior thermal management, large specific surface area as well as good water wettability limits the overall solar water purification efficiency. Herein, porous TiN nanospheres are prepared for solar water purification. The monodispersed porous TiN nanospheres are prepared through the wet-chemistry synthesis of TiO2 and followed nitridation. The prepared porous TiN nanospheres have relatively large specific surface area and very good hydrophilicity. In comparison with solid TiN nanospheres, the porous counterparts have stronger light absorption and better thermal management. The optimum solar evaporation film prepared with the porous TiN nanospheres and filter membrane (TiN/FM) exhibit a reflectance smaller than ~19% in the entire solar spectrum. All these merits of the porous TiN nanospheres give rise to a water evaporation rate of 1.68 kg m-2 h-1 and a solar-steam conversion efficiency of 93.4% under AM 1.5 irradiation. Both seawater and polluted water can be purified to potable water with TiN/FM. Our work not only provides a preparation approach for monodispersed porous TiN nanospheres but also demonstrates the great potential of porous plasmonic nanoparticles for the future development of solar water purification. © 2023, The Authors. All rights reserved.

关键词： Nanospheres

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Fatigue life research and experimental verification of superalloy thin-walled structures subjected to thermal-acoustic loads

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Chinese Journal of Aeronautics 2020年第2期33卷 598-608页

作者： Jian WANG Fengtong ZHAO Yundong SHA Song GU Department of Aircraft Maintenance Engineering Chengdu Aeronautic PolytechnicChengdu 610100China Liaoning Key Laboratory of Advanced Test Technology for Aeronautical Propulsion System Shenyang Aerospace UniversityShenyang 110136China

Rapid alternating stress is formed in structure subjected to harsh thermal-acoustic loads,which will affect fatigue performance and reduce fatigue life ***,fatigue experiment of superalloy thin-walled structure was carried out to obtain fatigue damage location and failure time of the experiment specimen,and S-iN curves of superalloy thin-walled structure at 723 K were ***,dynamic response simulation of superalloy thin-walled structure under the same load as experiment was implemented,and fatigue life was estimated based on the fatigue life prediction model which mainly included:improved rain-flow counting method,Morrow average stress model and Miner linear cumulative damage ***,comparisons between simulation solutions and experimental results achieved a consistency,which verified the validity of the Fatigue Life Prediction Model(FLPM).Moreover,taking a rectangle plate as the analysis object,the distributions of Fain-low circulation blocks and damage levels of the structure were discussed ***,current research indicates that in pre-buckling the structure is in softened area and fatigue life decreases with the increase of temperature;in post-buckling the structure is in hardened area and fatigue life increases with the increase of temperature within a certain range.

关键词： Experimental verification Fatigue life Improved rain-flow counting method Rain-flow cycle matrix Rain-flow damage matrix Thermal-acoustic load Thin-walled structures

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