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Tailoring mechanical and magnetic properties of AlCoCrFeNi high-entropy alloy via phase transformation

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Journal of Materials Science & Technology 2021年第14期73卷 83-90页

作者： Chendong Zhao Jinshan Li Yudong Liu William Yi Wang Hongchao Kou eric beaugnon Jun Wang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an710072PR China Univ.Grenoble Alpes INSA ToulouseUniv.Toulouse Paul SabatierEMFLCNRSLNCMI38000GrenobleFrance

Phase constitutions,either changed by alloying or by phase transformation,are the key factors to determine the magnetic and mechanical performances of high-entropy alloys(HEAs).Using the AlCoCrFeNi HEA as a candidate alloy,this paper demonstrates the effect of phase transformation on both the mechanical and magnetic properties in the multi-phase *** increasing heat treatment temperature,the sigma(σ)and face-centered-cubic(FCC)phases disappeared at 1000℃and 1200℃,*** volume fraction changes ofσ,FCC and body-centered-cubic(BCC)phases have divergent effects on mechanical and magnetic *** excellent strength-ductility combination will be achieved as the disappearance ofσphase and formation of FCC *** for the magnetic properties,the volume fraction of BCC phase plays a major role in determining its saturation *** the volume fraction change of BCC phase is not evident,the higher volume fraction of FCC phase will influence its magnetization at 2 *** present work might provide insights into analyzing the evolution of both mechanical and magnetic properties of HEAs caused by complex phase transformation.

关键词： High-entropy alloy Phase transformation Mechanical property Magnetic property

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

High Field Environment for EPM at the LNCMI

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Journal of Iron and Steel Research International 2012年第S2期19卷 1072-1075页

作者： beaugnon eric DEBRAY Francois LNCMI CNRS/UJF/INSA UPS

The Laboratoire National des Champs Magn(?)tiques Intenses(LNCMI) is the CNRS French National High Magnetic Field Facility associated with three universities:Joseph Fourier in Grenoble,Paul Sabatier and INSA in *** delivers to researchers direct current high magnetic field up to 35 teslas in 34 mm in Grenoble and pulsed field up to 80 T in *** of new high field magnets and associated instrumentations are user oriented. These developments(highly homogeneous magnets,magnets for diffraction studies,high field gradient magnet...) are impulsed by different user *** a few years,magneto-science is attracting new users for the study of high field effects on physical,chemical and biological processes such as electrochemistry,metallurgy,nanostructuration, implying new methodologies and new experimental developments such as high temperature environment up to 1600 K.A survey of these developments is *** laboratory is supported by the European Commission which contributes for the 'Transnational Access' to the facility.

关键词： high magnetic fields instrumentation levitation

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−liquid structure transition in metallic melt and its impact on solidification:A review

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2293-2310页

作者： Yi-xuan HE Jin-shan LI Jun WANG eric beaugnon State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China UniversitéGrenoble Alpes INSA ToulouseUniversitéToulouse Paul SabatierEMFLCNRSLNCMI38000 GrenobleFrance

Understanding the nature of liquid structures and properties has always been a hot field in condensed matter physics and metallic materials *** liquid is not homogeneous and the local structures inside change discontinuously with temperature,pressure,*** liquid will experience liquid−liquid structure transition under a certain ***−liquid structure transition widely exists in many metals and alloys and plays an important role in the final microstructure and the properties of the solid *** work provides a comprehensive review on this unique structure transition in the metallic liquid together with the recent progress of its impact on the following microstructure and properties after *** effects are discussed by integrating them into different experimental results and theoretical *** application of liquid−liquid structure transition as a strategy to tailor the properties of metals and alloys is proven to be practical and efficient.

关键词： liquid−liquid structure transition metals and alloys thermal history solidification

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

Effect of Static Mgnetic Fields on the Recalescence Behavior of Undercooled Co-Sn Liquid

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Journal of Iron and Steel Research International 2012年第S2期19卷 1076-1080页

作者： WANG Jun beaugnon eric LI Jin-shan HU Rui RIVOIRARD Sophie SULPICE Andre State Key Laboratory of Solidification Processing Northwestern Polytechnical University CNRS/CRETA 25 rue des martyrs BP16638042 Grenoble CEDEX 9France

The recalescence behavior of undercooled Co-Sn alloys under static magnetic fields was investigated using glass slag fluxing technique in a 12T superconducting *** indicated that the nucleation temperature and the highest temperature after recalescence of undercooled melt can be affected by the static magnetic *** undercooling for Co-Sn alloys keep unchanged when a strong magnetic field was applied while the recalescence extent was reduced. With the increasing Co content for Co-Sn eutectic systems,the effect of the magnetic field on the recalescence was *** find that the magnetic field has very limited effect on the nucleation temperature on alloys while the highest temperature after recalescence is affected by the field depending on the magnetization difference of the undercooled melt before and after solidification.

关键词： Recalescence undercooling magnetic field solidification.

高温原位测试材料相变的新方法：高温法拉第磁秤

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材料科学与工艺 2011年第2期19卷 23-27页

作者：张翠萍 Xavier Chaud eric beaugnon 曹海涛周廉西北工业大学凝固技术国家实验室西安710072 西北有色金属研究院西安710016 Universite Joseph Fourier Grenoble 38000France CRETA/CNRS Grenoble 38042France

高温原位磁化率测试法利用顺磁性材料在相变时磁化率变化的原理,直接测试出材料相变时的转变温区,是研究顺磁性材料相变的一种新的尝试.我们采用高温法拉第磁秤测试了Ag2O和CuO在升温和降温中磁化率的变化曲线,通过磁化率的转变演示了A... 详细信息

高温原位磁化率测试法利用顺磁性材料在相变时磁化率变化的原理,直接测试出材料相变时的转变温区,是研究顺磁性材料相变的一种新的尝试.我们采用高温法拉第磁秤测试了Ag2O和CuO在升温和降温中磁化率的变化曲线,通过磁化率的转变演示了Ag2O和CuO相变的动态过程.以此介绍了原位观测顺磁性材料晶体学相变的高温法拉第磁秤方法.高温法拉第磁秤在相变研究上的应用为顺磁性材料制备工艺提供了真实可靠的实验参数.

关键词：高温法拉第磁秤晶体学相变磁化率 Ag2O CuO

强磁场下Cu-Co难混溶合金凝固过程中晶体取向和性能的调整(英文)

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Transactions of Nonferrous Metals Society of China 2023年

作者：魏晨李金山闫育洁贺一轩 eric beaugnon 王军西北工业大学凝固技术国家重点实验室 Univ.Grenoble Alpes， INSA Toulouse， Univ.Toulouse Paul Sabatier， EMFL，CNRS， LNCMI

对Cu50Co50合金在不同磁场强度下进行了非平衡凝固实验，研究了富钴相的取向、组织演化和磁性能。结果表明，凝固后相分离的棒状富钴相可以实现排列形态，并沿5 T强磁场(HMF)方向以＜111＞的晶体方向发生取向。然而发生二次液-液相分离... 详细信息

对Cu50Co50合金在不同磁场强度下进行了非平衡凝固实验，研究了富钴相的取向、组织演化和磁性能。结果表明，凝固后相分离的棒状富钴相可以实现排列形态，并沿5 T强磁场(HMF)方向以＜111＞的晶体方向发生取向。然而发生二次液-液相分离的富铜相的取向没有受到HMF的显著影响。在0 T磁场下凝固的合金表现出近磁各向同性行为，而在5 T磁场下凝固的合金则表现出磁各向异性行为。合金的饱和磁化强度略有增加，矫顽力相应降低，这与富钴晶体的取向演化行为密切相关。

关键词：强磁场微观组织演化铜钴合金相分离磁性能