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Magnetic field intensity dependent microstructure evolution and recrystallization behavior in a Co-B eutectic alloy

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Journal of Materials Science & Technology 2023年第7期138卷 93-107页

作者： Fan Bu Yiyuan Zhang Haoxiang Liu Jun Wang Eric Beaugnon Jinshan Li yixuan he State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China Collaborative Innovation Center of NPU Shanghai 201108China Institute of Superconducting Materials and Applied Technology Northwestern Polytechnical UniversityXi’an 710072China Univ.Grenoble Alpes INSA ToulouseUniversity Toulouse Paul SabatierEMFLCNRSLNCMIGrenoble 38000France

Systematic understanding on the magnetic field intensity dependent microstructure evolution and re-crystallization behavior in a Co-B eutectic alloy under a constant undercooling(ΔT≈100 K)were carried *** of the magnetic field,the comparable size of divorced FCC-Co and Co_(3)B eutectic ellipsoidal grains coexist with a few regular *** the magnetic field is less than 15 T,the elongated primary FCC-Co dendrites parallel to the magnetic field with the dispersed FCC-Co nano-particles em-bedded within the Co_(3)B matrix occupy the inter-dendrite *** the magnetic field increases to 20 T,the FCC-Co/Co_(2)B anomalous eutectic colonies *** formation mechanism of Co_(2)B phase is discussed from several aspects of the competitive nucleation,the chemical redistribution induced by the thermomagnetic-induced convection and magnetic dipole interaction,and the strain-induced ***,the application of magnetic field is found to promote recrystallization,proved by the lower density of misorientation,the appearance of FCC-Co annealed twins and more Co_(3)B *** work could further enrich our knowledge about the magnetic-dependent microstructure evolution and recrystallization process in the undercooled Co-B system and provide guidance for controlling the microstructures and properties under extreme conditions.

关键词： Magnetic field Undercooled solidification Microstructure evolution Recrystallization Co-B alloy

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凝固过程多尺度原位研究进展

铸造技术 2024年第3期45卷 191-207页

作者：张伦勇贺一轩孙剑飞哈尔滨工业大学材料科学与工程学院黑龙江哈尔滨150001 哈尔滨工业大学金属精密热加工国家级重点实验室黑龙江哈尔滨150001 西北工业大学材料学院陕西西安710072 西北工业大学凝固技术国家重点实验室陕西西安710072

凝固过程控制是诸多相关技术的核心,在不同尺度上理解凝固行为对于实现凝固过程的有效设计与精确控制至关重要。历经数十载,凝固行为的原位研究已在微观尺度上揭示出凝固组织动态演化的丰富行为,并逐步向纳观尺度拓展。本文简要梳理了... 详细信息

凝固过程控制是诸多相关技术的核心,在不同尺度上理解凝固行为对于实现凝固过程的有效设计与精确控制至关重要。历经数十载,凝固行为的原位研究已在微观尺度上揭示出凝固组织动态演化的丰富行为,并逐步向纳观尺度拓展。本文简要梳理了近半个世纪以来在微观尺度及纳观尺度凝固行为原位研究所取得的主要成果,总结了凝固过程多尺度原位研究方法,从原位研究角度揭示了胞晶、枝晶转变与组织演化行为及其影响规律,展示了目前已知的关于等轴晶、共晶体系凝固及组织特征的原位研究成果,也简要介绍了当前在金属熔体纳观尺度形核行为方面原位研究得到的认知。

关键词：凝固过程原位研究多尺度行为

Effect of long-term aging treatment on the tensile strength and ductility of GH 605 superalloy

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Progress in Natural Science:Materials International 2022年第3期32卷 375-384页

作者： yixuan he Xudong Liu Chenxu Xing Zhangchi Bian Qing Zhou Jun Wang Haifeng Wang Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin

Aging treatment is an effective way to optimize the mechanical properties of Co-based superalloys. In this study,commercial GH 605 superalloy was subjected to aging treatment at 650℃ in a wide time range up to 1000 h. The effects of aging time on the tensile characteristics, microstructure evolution and mechanical properties were systematically investigated at room temperature(RT) and 900℃. The results showed that the volume fractions of M6C and M23C6carbide increased with the aging time. After long-term aging treatment, the yield strength(YS) at RT was enhanced from 490.3 MPa to 805.9 MPa, while the alloy still had high tensile ductility(above 20%).Microscopic observations by transmission electron microscopy(TEM) indicated that the strengthening mechanism was related to carbide precipitation inside the grains and the change in the dislocation slipping mode. Moreover,long-term aging treatment can increase the elongation from 24.1% to 47.3% at 900℃ accompanied by a slight increase of YS from 299.3 MPa to 313.9 MPa. Based on detailed microstructure analysis the strengthening mechanism can be attributed to the refined grains as well as carbide precipitation inside the grains and around the grain boundaries.

关键词： GH 605 superalloy Long-term aging treatment Carbide Strengthening mechanism

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黄疸外治法的研究进展

实用中医内科杂志 2024年第7期38卷 1-3页

作者：孙叶卫家润刘家玲何毅轩陈月桥广西中医药大学广西南宁530000 广西中医药大学第一附属医院广西南宁530000

探讨黄疸外治法的研究进展,黄疸外治法在治疗上的不足及医学工作者将来需要突破的目标,以期为黄疸临床治疗提供参考。通过查阅分析大量近年来外治法治疗各类黄疸的临床研究等相关文献进行综述。对黄疸的中医病因病机、发展简史进行简述... 详细信息

探讨黄疸外治法的研究进展,黄疸外治法在治疗上的不足及医学工作者将来需要突破的目标,以期为黄疸临床治疗提供参考。通过查阅分析大量近年来外治法治疗各类黄疸的临床研究等相关文献进行综述。对黄疸的中医病因病机、发展简史进行简述,并从吹鼻疗法、药浴疗法、灌肠疗法、按摩疗法、中药熏洗、脐疗、穴位贴敷疗法、中医综合疗法及西医外治法等方面对黄疸外治法进行归纳总结。历经多年的研究和发展,治疗黄疸的外治法已较为完善,但仍有一部分问题等待去解决。

关键词：黄疸外治法研究进展

Conditional Generative Adversarial Network Enabled Localized Stress Recovery of Periodic Composites

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 957-974页

作者： Chengkan Xu Xiaofei Wang yixuan Li Guannan Wang he Zhang Transportation and Municipal Engineering Institute Powerchina Huadong Engineering CorporationHangzhou310014China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China Anhui Transport Consulting&Design Institute Co. Ltd.Hefei230088China Center for Balance Architecture Zhejiang UniversityHangzhou310058China

Structural damage in heterogeneousmaterials typically originates frommicrostructures where stress concentration ***,evaluating the magnitude and location of localized stress distributions within microstructures under external loading is *** unit cells(RUCs)are commonly used to represent microstructural details and homogenize the effective response of *** work develops a machine learning-based micromechanics tool to accurately predict the stress distributions of extracted *** locally exact homogenization theory efficiently generates the microstructural stresses of RUCs with a wide range of parameters,including volume fraction,fiber/matrix property ratio,fiber shapes,and loading ***,the conditional generative adversarial network(cGAN)is employed and constructed as a surrogate model to establish the statistical correlation between these parameters and the corresponding localized *** stresses predicted by cGAN are validated against the remaining true data not used for training,showing good *** work demonstrates that the cGAN-based micromechanics tool effectively captures the local responses of composite *** can be used for predicting potential crack initiations starting from microstructures and evaluating the effective behavior of periodic composites.

关键词： Periodic composites localized stress recovery conditional generative adversarial network

Effects of an ultra-high magnetic field up to 25 T on the phase transformations of undercooled Co-B eutectic alloy

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Journal of Materials Science & Technology 2021年第34期93卷 79-88页

作者： yixuan he Yuhao Wua Fan Bu Chengxiong Zou Zhangchi Bian Qiliang Huang Tie Liu Qiang Wang Jun Wang Jinshan Li Eric Beaugnon State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an.710072China Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University.Xi'an710072China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University.Shenyang110819China Univ.Grenoble Alpes INSA ToulouseUniv.Toulouse Paul SabatierEMFLCNRSLNCMIGrenoble38000France

While there have been multiple recent reports in the literature focusing on the effects of magnetic field on the phase transformation behaviors,the research conducted with an ultra-high magnetic field greater than 20 T is still *** the current study,the structure evolution of Co-B alloys are experimentally studied with *** effects of a 25 T magnetic field on the solidification behavior and the subsequent solid-state phase transformation behavior have been *** 25 T magnetic field is confirmed to have little effect on the homogeneous nucleation,but have some influence on the heterogeneous nucleation of Co_(3) B and Co_(23)B6 phases by modifying the wetting angleθ.The decomposition of Co_(23)B6 phase in the subsequent cooling process can be effectively suppressed by applying the 25 T magnetic *** present work might be helpful for not only theoretically understanding the influence of ultra-high magnetic field on the phase transformation behaviors but a potential technology of field-manipulation of magnetic materials.

关键词： Ultra-high magnetic field Non-equilibrium solidification Solid-state phase transformation Metastable phase

Liquid state dependent solidification of a Co-B eutectic alloy under a high magnetic field

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Journal of Materials Science & Technology 2022年第21期116卷 58-71页

作者： yixuan he Fan Bu Yuhao Wu Jianbao Zhang Dawei Luo Zhangchi Bian Qing Zhou Tie Liu Qiang Wang Jun Wang Haifeng Wang Jinshan Li Eric Beaugnon State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China Collaborative Innovation Center of NPU Shanghai 201108China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Univ.Grenoble Alpes INSA ToulouseUniv.Toulouse Paul SabatierEMFLCNRSLNCMI38000 GrenobleFrance

The structure transition inside the Co-81.5at.%B alloy liquid has been studied by an in-situ magnetization measurement.A crossover was observed on the 1/M-T curve during the overheating process,indicating that a liquid-liquid structure transition(LLST)took place in the *** on this information,the effects of LLST on the solidification behavior,microstructure and tribology property were investigated *** sample solidified with the LLST exhibits significantly different solidification behaviors,i.e.,the nucleation undercooling and the recalescence extent are conspicuously enlarged,and the solidification time is *** a result,the microstructure is effectively refined and homogenized,and the hardness and wear resistance are significantly *** present work might be helpful for not only theoretically understanding the influence of LLST on the solidification behavior but also providing an alternative approach to tailor the microstructure and properties.

关键词： Liquid-liquid structure transition Solidification Magnetization Tribology property

The Mystery 40 Hz:Unraveling the Efficacy of Rhythmic Stimulation in Alzheimer's Disease

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Neuroscience Bulletin 2024年第6期40卷 831-834页

作者： yixuan Ku Guangdong Provincial Key Laboratory of Brain Function and Disease Center for Brain and Mental Well-beingDepartment of PsychologySun Yat-sen UniversityGuangzhou510006China Peng Cheng Laboratory Shenzhen518000China

Promises and Challenges of Rhythmic *** advances in research have made significant strides in understanding the potential of 40 Hz rhythmic optogenetic stimulation for the treatment of Alzheimer's disease(AD).A pivotal study conducted by Iaccarino et al.(2016)unveiled that targeted stimulation of interneurons at this specific frequency results in a remarkable reduction ofβ-amyloid levels in a mouse model of AD[1].

关键词： stimulation Alzheimer

深过冷Co-B合金外源触发形核行为及组织研究

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铸造技术 2024年第3期45卷 300-308页

作者：张瑶清卜凡张垚君程宇豪贺一轩王军李金山西北工业大学凝固技术国家重点实验室陕西西安710072 西北工业大学先进润滑与密封材料研究中心陕西西安710072

合金的形核机制及其控制方法是凝固理论的重要研究领域之一。触发形核方式可自主控制形核过冷度,对研究形核理论及组织演变具有极大帮助。但熔体具有亚稳性,在实际处理时,外源性杂质引入熔体后将作为触发形核异质点,改变过冷度ΔT和再... 详细信息

合金的形核机制及其控制方法是凝固理论的重要研究领域之一。触发形核方式可自主控制形核过冷度,对研究形核理论及组织演变具有极大帮助。但熔体具有亚稳性,在实际处理时,外源性杂质引入熔体后将作为触发形核异质点,改变过冷度ΔT和再辉度ΔT_(R),显著影响后续凝固行为,该种现象更为普遍。本文通过玻璃包覆结合循环过热过冷方式,获得两类不同形核模式凝固的Co_(80)B_(20)合金。自发形核模式下,ΔT及ΔT_(R)分别为280和199 K,组织组成为Co/Co_(3)B细小规则共晶。外源性触发形核模式下,ΔT和ΔT_(R)降至122和21 K。组织转变为初生Co枝晶及晶间的Co_(23)B_(6)基体相。外源性杂质将降低f(θ),减小临界形核半径,降低ΔT,使得组织更加不均匀,在实际的熔体处理过程中应予以控制。

关键词：形核模式 Co-B合金凝固行为微观结构