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Spark plasma sintering of a novel Mg-0.7Ca alloy: A comprehensive study

Journal of Magnesium and Alloys 2025年第3期13卷 1325-1340页

作者： Parisa Golmohammadi Behzad Nayebi Ahmad Bahmani Nader Parvin Woo Jin Kim Department of Materials and Metallurgical Engineering Amirkabir University of Technology(Tehran Polytechnic)TehranIran Department of Advanced Materials and Renewable Energy Iranian Research Organization for Science and TechnologyTehranIran Department of Materials Science and Engineering Hongik UniversitySeoulRepublic of Korea

Light-weight Mg-based alloys have gained attention owing to their various applications in engineering and biomedicalﬁ*** advancements in modern powder metallurgy techniques,such as spark plasma technique(SPS),have enabled achieving near-net-shape products with tailored properties and decreased in-process ***,improving their mechanical and physical properties require further *** this study,a novel Mg-0.7Ca alloy was produced using SPS *** effects of process parameters such as sintering time and additive type on the microstructural evolutions,phase arrangements,and mechanical and physical properties of the consolidated materials were investigated through various characterization ***-dense samples were produced from 60-minute ball-milled powder mixtures through spark plasma sintering at 420℃ for 7,10,and 13 min under 38 MPa of externally applied *** obtained samples were then characterized using Field Emission Scanning Electron Microscopy(FESEM),Electron Backscatter Diffraction(EBSD),X-ray Energy Dispersive Spectroscopy(EDS),and X-ray Diffraction(XRD)analysis methods,as well as mechanical tests including compression strength and micro-hardness *** results indicated that while improved densiﬁcation behavior is observed in parafﬁn-contained samples,relatively better compression properties are achieved in starch-contained *** is also found that the phase arrangement of the starch-contained samples includes higher fractions of the secondary phases such as oxides and residual carbons,which can positively affect the mechanical strength,despite decreased *** microstructural characterizations showed an intensiﬁed thermomechanical response of the materials in both groups via increased sintering ***,the competition between the inﬂuencing parameters causes scattered strengthening behavior and texture in the consolidated *** discussions about the densiﬁcation behavior,te

关键词： Powder metallurgy Magnesium Spark plasma sintering Grain boundary Mechanical properties Texture

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Design and fabrication of 1D nanomaterials for electromagnetic wave absorption

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国家科学评论（英文版） 2025年第2期12卷 360-382页

作者： Hongdu Jin Min Liu Lei Wang Wenbin You Ke Pei Han-Wen Cheng Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceAcademy for Engineering &TechnologyFudan UniversityShanghai 200438China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceAcademy for Engineering &TechnologyFudan UniversityShanghai 200438China College of Physics Donghua UniversityShanghai 201620China School of Materials Science &Engineering Tongji UniversityShanghai 201804China

The design and fabrication of high-performance electromagnetic wave(EMW)absorbing materials are essential in developing electronic communication technology for defense and civilian *** materials function by interacting with EMWs,creating various effects such as polarization relaxation,magnetic resonance,and magnetic hysteresis in order to absorb *** progress has been made to improve the dimensional performance of such materials,emphasizing the'thin,light,broad,and strong'functional ***-dimensional(1D)nanostructures are characterized by high surface area,low density,and unique electromagnetic properties,providing promising solutions to address some of the challenges in facilitating multiple reflections and wideband resonances,which are crucial for effective EMW *** paper provides an overview of recent advances in exploring 1D structures for enhancing EMW absorption and their *** design and fabrication of nanofibers,nanowires,and other 1D nanostructures are *** advantages of 1D nanomaterials in EMW absorption are also *** and future directions are discussed,focusing on developing new design concepts and fabrication methods for achieving high-performance and lightweight EMW absorbers and enhancing fundamental understanding of EMW absorption mechanisms.

关键词： electromagnetic wave absorption one-dimensional nanomaterials absorption mechanism fabrication methods

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Gyroid Triply Periodic Minimal Surface Lattice Structure Enables Improved Superelasticity of CuAlMn Shape Memory Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1047-1065页

作者： Mengwei Wu Chunmei Ma Ruiping Liu Huadong Fu Department of Materials Science and Engineering China University of Mining and Technology(Beijing)Beijing100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China

Improving the shape memory effect and superelasticity of Cu-based shape memory alloys(SMAs)has always been a research hotspot in many *** work systematically investigates the effects of Gyroid triply periodic minimal surface(TPMS)lattice structures with different unit sizes and volume fractions on the manufacturing viability,compressive mechanical response,superelasticity and heating recovery properties of CuAlMn *** results show that the increased specific surface area of the lattice structure leads to increased powder adhesion,making the manufacturability proportional to the unit size and volume *** compressive response of the CuAlMn SMAs Gyroid TPMS lattice structure is negatively correlated with the unit size and positively correlated with the volume *** superelastic recovery of all CuAlMn SMAs with Gyroid TPMS lattice structures is within 5%when the cyclic cumulative strain is set to be 10%.The lattice structure shows the maximum superelasticity when the unit size is 3.00 mm and the volume fraction is 12%,and after heating recovery,the total recovery strain increases as the volume fraction *** study introduces a new strategy to enhance the superelastic properties and expand the applications of CuAlMn SMAs in soft robotics,medical equipment,aerospace and other fields.

关键词： Shape memory alloys Superelasticity Gyroid triply periodic minimal surface(TPMS)lattice structure Selective laser melting(SLM)

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Fe-based high-entropy alloy with excellent mechanical properties enabled by nanosized precipitates and heterogeneous grain distribution

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Journal of materials science & technology 2024年第14期181卷 71-81页

作者： Heechan Jung Sangwon Lee Taehyeok Kang Alireza Zargaran Pyuck-Pa Choi Seok Su Sohn Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Graduate Institute of Ferrous and Energy Materials Technology Pohang University of Science and TechnologyPohang 37673Republic of Korea

High-entropy alloys(HEAs)consisting of CoCrFeNiAlTi systems,with a face-centered cubic(FCC)matrix reinforced by ordered L12 precipitates,have demonstrated exceptional strength-ductility ***,the current compositional design of HEAs heavily relies on high Ni and Co contents,compro-mising the balance between properties and ***,it is crucial to optimize the cost-performance trade-offby fine-tuning the range of Fe,Co,and Ni,while maintaining excellent strength-ductility *** this study,we propose a novel Fe-based HEA with nanosized precipitates and a heteroge-neous grain distribution,achieving a strength-ductility combination comparable to state-of-the-art Ni-or Co-based *** alloy benefits from both precipitation hardening and hetero-deformation-induced strengthening attributed to the heterogeneous grain distribution,resulting in excellent yield strength of 1433 MPa,tensile strength of 1599 MPa,and ductility of 22%.The microstructural evolution and its in-fluence on mechanical properties are unraveled with respect to the observation of precipitate-dislocation interaction and hetero-deformation-induced stress(HDI stress)*** study suggests that the challenge of balancing properties and cost can be addressed through optimized compositional and mi-crostructural design.

关键词： High-entropy alloys Precipitation Heterogeneous microstructure Mechanical property HDI stress

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Machine learning-assisted efficient design of Cu-based shape memory alloy with specific phase transition temperature

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International Journal of Minerals,Metallurgy and materials 2024年第4期31卷 773-785页

作者： Mengwei Wu Wei Yong Cunqin Fu Chunmei Ma Ruiping Liu Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

The martensitic transformation temperature is the basis for the application of shape memory alloys(SMAs),and the ability to quickly and accurately predict the transformation temperature of SMAs has very important practical *** this work,machine learning(ML)methods were utilized to accelerate the search for shape memory alloys with targeted properties(phase transition temperature).A group of component data was selected to design shape memory alloys using reverse design method from numerous unexplored *** modeling and feature modeling were used to predict the phase transition temperature of the shape memory *** experimental results of the shape memory alloys were obtained to verify the effectiveness of the support vector regression(SVR)*** results show that the machine learning model can obtain target materials more efficiently and pertinently,and realize the accurate and rapid design of shape memory alloys with specific target phase transition *** this basis,the relationship between phase transition temperature and material descriptors is analyzed,and it is proved that the key factors affecting the phase transition temperature of shape memory alloys are based on the strength of the bond energy between *** work provides new ideas for the controllable design and performance optimization of Cu-based shape memory alloys.

关键词： machine learning support vector regression shape memory alloys martensitic transformation temperature

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State-of-art of in situ observations of inclusion agglomeration at steel/Ar and steel/slag interfaces:a review of recent development on experimental and theoretical studies

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Journal of Iron and Steel Research International 2025年第2期32卷 315-333页

作者： Yi Wang Jian-xun Fu Deepoo Kumar Qiang Wang Hong-liang Yang Wang-zhong Mu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden Engineering Materials Division of Materials ScienceDepartment of Engineering Science and MathematicsLuleåUniversity of TechnologyLuleå 97187Sweden Department of Metallurgical Engineering and Materials Science IIT BombayPowaiMumbaiIndia Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina ABB Metallurgy Västerås 72136Sweden

Cleanliness control of advanced steels is of vital importance for quality control of the *** order to understand and control the inclusion removal during refining process in molten steel,its motion behaviors at the multiple steel/gas/slag interfaces have attracted the attention much of metallurgical *** recent development of the agglomeration of non-metallic inclusions at the steel/Ar and steel/slag interfaces has been summarized,and both the experimental as well as theoretical works have been *** terms of in situ observation of high-temperature interfacial phenomena in the molten steel,researchers utilized high-temperature confocal laser scanning microscopy to observe the movement of more types of inclusions at the interface,i.e.,the investigated inclusion is no longer limited to Al_(2)O_(3)-based inclusions but moves forward to rare earth oxides,MgO-based oxides,*** terms of theoretical models,especially the model of inclusions at the steel/slag interface,the recent development has overcome the limitations of the assumptions of Kralchevsky-Paunov model and verified the possible errors caused by the model assumptions by combining the water model and the physical *** but not least,the future work in this topic has been suggested,which could be in combination of thermal physical properties of steels and slag,as well as utilize the artificial intelligence-based methodology to implement a comprehensive inclusion motion behaviors during a comprehensive metallurgical process.

关键词： Inclusion movement Steel/Ar interface Steel/slag interface In situ observation

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advanced high-entropy alloys breaking the property limits of current materials

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Journal of materials science & technology 2024年第19期186卷 219-230页

作者： Dongyue Li Peter K.Liaw Lu Xie Yong Zhang Wenrui Wang School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

The growing need for stronger and more ductile structural materials has spurred an intense search for innovative,high-performance ***,alloys face a pervasive trade-off:high strength often comes at the expense of ductility and vice *** advent of high-entropy alloys(HEAs)offering both high strength and ductility has transformed this *** this work,we discuss the deformation mechanisms of HEAs,examine the foundations of the strength-ductility trade-off,and explore approaches for designing HEAs to surmount this ***,we analyze the factors that govern HEA-deformation performance,which in turn influence the HEA *** also propose a perspective on future research directions concerning the mechanical behavior of HEAs,highlighting potential breakthroughs and novel strategies to advance the field.

关键词： High-entropy alloy Strength-ductility Trade-off Microstructure Deformation mechanism

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Data driving design of high-entropy alloys for lightweight and dynamic applications

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science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 10-24页

作者： Kaixuan Cui Junwei Qiao Peter KLiaw Yong Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Materials Science and Engineering University of TennesseeKnoxville TN 37996USA

The topic of high-entropy alloys is one of the focus for both physics and materials ***-entropy alloys were usually defined as solid solution alloys,while the solid solution is different from the traditional terminal solid solution,because the solid solution without solvent element is the dominant *** discovery of high-entropy alloys greatly extended the composition space and the possibility of creating unique micro-and nano-level structures,which can meet the demands of lightweight and dynamic *** relationship between the phases and the parameters for the high-entropy alloys is rather *** data driving design can screen the specific high-entropy *** correlation between the composition and properties of highentropy alloys can be discovered by material genetic engineering and data science.

关键词： phase-formation rules materials genetic engineering lightweight high-entropy alloys dynamic properties

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Quantum Dots Mediated Crystallization Enhancement in Two-Step Processed Perovskite Solar Cells

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纳微快报（英文版） 2025年第7期17卷 342-354页

作者： Heng Liu Geyu Jin Jiantao Wang Weihai Zhang Long Qing Yao Zhang Qiongqiong Lu Pengfei Yue Guoshang Zhang Jing Wei Hongbo Li Hsing-Lin Wang Henan Key Laboratory of Advanced Conductor Materials Institute of MaterialsHenan Academy of SciencesZhengzhou 450046People's Republic of China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People's Republic of China Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081People's Republic of China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People's Republic of China College of New Energy Ningbo University of TechnologyNingbo 315336People's Republic of China Henan Key Laboratory of Advanced Conductor Materials Institute of MaterialsHenan Academy of SciencesZhengzhou 450046People's Republic of China

Hybrid organic-inorganic lead halide perovskites have emerged as a promising material for high-efficiency solar cells,yet challenges related to crystalliza-tion and defects limit their performance and *** study investigates the use of perovskite quantum dots(QDs)as crystallization seeds to enhance the quality of FAPbI3 perovskite films and improve the performance of perovskite solar cells(PSCs).We demonstrate that CsPbI3 and CsPbBr3 QDs effectively guide the crystallization process,leading to the formation of larger crystals with preferential orientations,particularly the(001)and(002)planes,which are associated with reduced defect *** seed-mediated growth strategy resultedin PSCs with power conversion efficiencies(PCEs)of 24.75％and 24.11％,respectively,compared to the baseline efficiency of 22.05％for control ***,devices incorporating QD-treated perovskite films exhibited remarkable stability,maintaining over 80％of their initial PCE after 1000 h of simulated sunlight exposure,a significant improvement over the *** optoelectronic characterization revealed reduced non-radiative recombination and enhanced charge transport in QD-treated *** findings highlight the potential of QDs as a powerful tool to improve per-ovskite crystallization,facet orientation,and overall device performance,offering a promising route to enhance both efficiency and stability in PSCs.

关键词： Quantum dots Perovskite solar cells Two-step Crystallization Efficiency Stability

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Restructuring the cell network of non-equiatomic CoCrFeNiMoC medium-entropy alloy fabricated by laser powder bed fusion

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材料科学技术（英文版） 2025年第11期214卷 143-152页

作者： Hyeonseok Kwon Eun Seong Kim Yoon-Uk Heo Jungho Choe Rae Eon Kim Soung Yeoul Ahn Sang-Ho Oh Jeong Min Park Byeong-Joo Lee Hyoung Seop Kim Center for Advanced Aerospace Materials Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Graduate Institute of Ferrous & Eco Materials Technology Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Department of 3D Printing Materials Korea Institute of Materials Science(KIMS)Changwon 51508Republic of Korea Department of 3D Printing Materials Korea Institute of Materials Science(KIMS)Changwon 51508Republic of Korea Department of Advanced Future Convergence Materials Korea UniversitySeoul 02841Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Graduate Institute of Ferrous & Eco Materials Technology Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul03722Republic of Korea Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai980-8577Japan

Metal additive manufacturing(MAM)enables near-net shape production of components with minimized waste and excellent mechanical performance based on multi-scale microstructural ***-cially,the dislocation cell network that often bears elemental segregation or precipitation of a secondary phase contributes to enhancing the strength of additively manufactured *** cell boundaries can also act as active nucleation sites for the formation of precipitates under post-MAM heat treatment,as the chemical heterogeneity and profuse dislocations generate a driving force for *** this work,we subjected a Co18Cr15Fe50Ni10Mo6.5C0.5(at％)medium-entropy alloy fabricated by laser powder bed fusion(LPBF)to post-LPBF annealing at 900 ℃ for 10 *** investigation revealed that the cell boundaries of the as-built sample,which were decorated by Mo segregation,are replaced byμ phase and M6C type carbide precipitates during annealing while the grain structure and size remain unaffected,indicating that the post-LPBF annealing delivered the proper amount of heat input to alter only the cell *** yield strength slightly decreased with annealing due to a reduction in the strengthening effect by the cell boundaries despite an increased precipitation strengthening ***-ever,the post-LPBF annealing improved the strain hardenability and the ultimate tensile strength was enhanced from～1.02 to～1.15 GPa owing to reinforced back stress hardening by the increased disloca-tion pile-up at the *** results suggest that the cell structure with chemical heterogeneity can be successfully controlled by careful post-MAM heat treatment to tailor the mechanical performance,while also providing insight into alloy design for additive manufacturing.

关键词： Laser powder bed fusion Medium-entropy alloy Cell structure Strain hardening Precipitation Back stress hardening

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