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Laser powder b e d fusion of copper matrix iron particle reinforced nanocomposite with high strength and high conductivity

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Journal of materials science & Technology 2023年第3期134卷 50-59页

作者： Yingang Liu Jingqi Zhang Qiang Sun Meng Li Ming Yan b Xing Cheng Miaoquan Li Ming-Xing Zhang School of Mechanical and Mining Engineering The University of QueenslandSt.LuciaQLD 4072Australia Department of Materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials Southern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Liquid-liquid phase separation,and the resulted solute segregation,during conventional solidification have been a long-term challenge to produce copper(Cu)-iron(Fe)immiscible composites with high strength and high *** present work reports an effective solution to this issue through laser powder bed fusion(L-PBF)in-situ alloying of Cu-8 wt.%*** observation showed that the fast cooling within micron-scale melt pools fully eliminated the Fe segregation and therefore the L-PBF fabricated nanocomposite achieved the homogeneous microstructure,which featured equiaxed fine grains around 1μm in *** of the nanocomposite at 600℃for 1 h enabled precipitation of two types of *** is coarser Fe nanoprecipitates with body-centered cubic(BCC)structure and diam-eter of 100-300 nm,mainly distributing along grain *** other is smaller Fe nanoprecipitates with face-centered cubic(FCC)structure and diameter of 10-35 nm,being observed within the grains and having coherent interfaces with the Cu *** a result,the aged Cu-Fe nanocomposite achieved tensile strength of 462.9±6.6 MPa with 30.4%±1.7%elongation to failure and 74.5%IACS(International Annealed Copper Standard)electrical *** formation mechanisms of the nanoprecipitates and the strengthening mechanisms of the nanocomposite are discussed.

关键词： Immiscible alloy Copper Laser powder bed fusion Ageing Nanocomposite

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Evolution of nonmetallic inclusions in 80-t 9CrMoCoB large-scale ingots during electroslag remelting process

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International Journal of Minerals,Metallurgy and materials 2024年第7期31卷 1525-1539页

作者： Shengchao Duan Min Joo Lee Yao Su Wangzhong Mu Dong Soo Kim Joo Hyun Park School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China Department of Materials Science and Chemical Engineering Hanyang UniversityAnsan 15588Rep.of Korea Department of Materials Science and Engineering KTH Royal Institute of TechnologyBrinellvägen 23Stockholm 10044Sweden Department of Engineering Science and Mathematics Division of Materials ScienceLuleåUniversity of Technology97187 LuleåSweden Casting&Forging Business Unit Nuclear Business GroupDoosan EnerbilityChangwon 51711Rep.of Korea

In combination with theoretical calculations,experiments were conducted to investigate the evolution behavior of nonmetallic inclusions(NMIs)during the manufacture of large-scale heat-resistant steel ingots using 9CrMoCoB heat-resistant steel and CaF_(2)–CaO–Al_(2)O_(3)–SiO_(2)–B_(2)O_(3)electroslag remelting(ESR)-type slag in an 80-t industrial ESR *** main types of NMI in the consumable electrode comprised pure alumina,a multiphase oxide consisting of an Al_(2)O_(3)core and liquid CaO–Al_(2)O_(3)–SiO_(2)–MnO shell,and M_(23)C_(6)carbides with an MnS *** Al_(2)O_(3)and MnS inclusions had higher precipitation temperatures than the M_(23)C_(6)-type carbide under equilibrium and nonequilibrium solidification ***,inclusions can act as nucleation sites for carbide layer *** ESR process completely removed the liquid CaO–Al_(2)O_(3)–SiO_(2)–MnO oxide and MnS inclusion with a carbide shell,and only the Al_(2)O_(3)inclusions and Al_(2)O_(3)core with a carbide shell occupied the remelted *** M_(23)C_(6)-type carbides in steel were determined as Cr_(23)C_(6)based on the analysis of transmission electron microscopy *** substitution of Cr with W,Fe,or/and Mo in the Cr_(23)C_(6)lattice caused slight changes in the lattice parameter of the Cr_(23)C_(6)***,Cr_(21.34)Fe_(1.66)C_(6),(Cr_(19)W_(4)C_(6),Cr_(18.4)Mo_(4.6)C_(6),and Cr_(16)Fe_(5)Mo_(2)C_(6)can match the fraction pattern of Cr_(23)C_(6)*** Al_(2)O_(3)inclusions in the remelted ingot formed due to the reduction of CaO,SiO_(2),and MnO components in the liquid *** increased Al content in liquid steel or the higher supersaturation degree of Al_(2)O_(3)precipitation in the remelted ingot than that in the electrode can be attributed to the evaporation of CaF_(2)and the increase in CaO content in the ESR-type slag.

关键词： nonmetallic inclusion heat-resistant steel electroslag remelting M_(23)C_(6) carbide MnS inclusion supersaturation degree

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Critical firing conditions for titanium alloys by molten droplet ignition

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Corrosion Communications 2023年第3期11卷 33-43页

作者： Lin Chen Yu Dong Yun-Qi Tong Mei-Jun Liu Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University

Reliable service of indispensable titanium alloys in aeroengines is limited by titanium fire with unclear critical *** this study,critical conditions in the form of parameter phase diagrams for secondary burning were determined by molten droplet *** element analysis（FEA） reveals that the molten droplet size（R0）,relative oxygen content（Pr）,and initial temperature（T0） significantly affect titanium fire following power exponential *** addition,Prand T0affect ablation synergically,and a unified empirical relationship for critical ablation of titanium alloy is ***,the critical T0of a typical TC4 alloy under 20%Pris higher than 973 K,which explains the reliable service performance of TC4 alloy at ≤ 873 K in compressors in commerical air *** addition,the critical empirical conditions are consistent with the FEA results,and the deviation occurs due to oxidation at T0≥ 673 ***,the ablated TC4 alloy can be divided into five characteristic zones,and loose and porous oxide scales are formed at the front of the titanium *** present study points the way towards long-lifetime services of TC4 alloys through sound titanium fire protection strategies.

关键词： Titanium fire Ablation Molten droplet ignition Critical conditions Scaling law

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Temperature dependence of pressure sensitive flow in bulk metallic glass composites

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Journal of materials science & Technology 2024年第14期181卷 165-175页

作者： Priyanka Saini Yakai Zhao Biao Li Long Zhang U.Ramamurty R.L.Narayan Department of Materials Science and Engineering Indian Institute of TechnologyDelhi 110016India School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Republic of Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research138634Republic of Singapore Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The constraint factor,C,defined as hardness,H,to the yield strength,σ_(y),ratio,is an indirect measure of the pressure sensitivity in *** investigations determined that while C is less than 3 for crystalline materials,and remains invariant with change in temperature,it is greater than 3 for bulk metallic glasses(BMGs)and increases with increasing temperature,below their glass transition temper-ature,T_(g).In this study,the variations in C for two BMG composites(BMGCs),which have an amorphous matrix and in situ precipitated crystallineβ-Ti dendrites,which in one case transforms under stress toα”-Ti and deforms by slip in the other,as a function of temperature are examined and compared with that of a *** this purpose,instrumented indentation tests,with a Berkovich tip,and uniaxial com-pression tests were performed to measure the H andσ_(y),respectively,on all alloys and their constituents at temperatures in the range of 0.48 T_(g) and 0.75 T_(g).σ_(y) and H of the BMGC with transforming dendrites(BMGC-T)increase and remain invariant with increasing temperature,***,in BMG and the BMGC with non-transforming dendrites(BMGC–NT),the same properties decrease with increas-ing ***-T has the highest C of∼4.93 whereas that of BMGC–NT and BMG are∼3.72 and∼3.28,respectively,at 0.48 T_(g).With increasing temperature,C of the BMG and BMGC–NT increases with temperature,but that of the BMGC-T *** values of C and their variations as a function of temperature were explained by studying the variation of pressure sensitivity of the amorphous phase and concluding that the plastic flow in BMGCs under constrained conditions,such as indentation,is con-trolled by the flow resistance of the amorphous matrix whereas that in uniaxial compression,which is only partially constrained,is controlled by plasticity in both the dendrites and matrix.

关键词： Bulk metallic glass composites Hardness Pressure sensitivity Martensitic transformation

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Thermal and mechanical enhancements in polyimide/basalt fiber composites through mineral-based nano-dust particles

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Iranian Polymer Journal (English Edition) 2025年 1-12页

作者： Kumar, Arputham Arul Jeya Kumar, Ramasamy Senthil Madan, Madhur Gangishetti, Ankit Prakash, Muniyandi Department of Mechanical Engineering Center for Composites and Advanced Materials SRM Institute of Science and Technology Kattankulathur Tamil Nadu Chennai603203 India Department of Mechanical Engineering Mohamed Sathak Engineering College Tamil Nadu Keelakarai623806 India

The mineral-based nanoparticles derived from grinding of automobile brake pads are used in this study. The influence of nano-brake-pad dust particles in polyimide (PI) reinforced basalt fiber (BF) composites is experimentally investigated. Four different weight fractions of composites are prepared using hot compression molding. The fabricated PBN composites with dispersed nano-dust fillers find applications in automobile and aerospace engineering. The physical properties of the formulated composites are studied using Fourier transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) are carried out to identify the enhanced thermal behavior of the composites. The FTIR spectrum indicates the stretching of molecular structure for the occurrence of C=O links. SEM shows the strong interfacial bonding between the ingredients and matrix. DSC shows the glass transition temperature reduces with nanoparticles addition. TGA reveals that the composites withstand a temperature of 512.15 °C without degrading and the percentage of weight loss after degradation of the composite enhances to 28.64% more, when compared to the pure sample. DMA shows a significant increase of about 84.32% in storage modulus and subsequent decrease in the value of tan δ by around 42.9% when the weight percentage of nano-dust particles increases, compared with pure composites. The presence of multiple elements in the nano-dust particles may influence the physical and thermo-mechanical properties of the polymer composite when compared with single compound nanocomposites. © Iran Polymer and Petrochemical Institute 2025.

关键词： Compression molding

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Improving fire retardancy of Ti alloys with a refractory ceramic barrier layer

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Corrosion Communications 2023年第4期12卷 19-28页

作者： Lin Chen Yu Dong Yun-Qi Tong Mei-Jun Liu Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University

Reliable service of indispensable titanium alloys in aeroengines is limited by the bottleneck problem of titanium fires. In this study, a tri-layer fire retardant coating with a bi-functional ceramic barrier layer is proposed to suppress titanium fire. Results show that the current coating can increase the fire retardant temperature by ≥300 K under droplet ignition. Thermal barrier effect of the YSZ refractory ceramic layer significantly reduces Ti alloy temperature, and oxygen barrier effect prevents active Ti from directly contacting oxygen during the entire ablation process. Therefore, the two barrier effects effectively prevent occurrence of titanium fire. In addition,dissolution of the Ni-based abradable seal coating makes burning TC4 molten droplet extinguished in a short time, thus further inhibiting titanium fire ignition. The present study provides an effective method for reliable service and titanium fire-resistant design of titanium alloys.

关键词： Ceramic barrier coating Abradable seal coating Fire retardant Ablation Melting

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Corrosion behavior of single-and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution

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International Journal of Minerals,Metallurgy and materials 2023年第4期30卷 689-696页

作者： Dongpeng Wang Guang Chen Anding Wang Yuxin Wang Yanxin Qiao Zhenguang Liu Zhixiang Qi Chain Tsuan Liu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Advanced Structural Materials Department of Mechanical and Biomechanical EngineeringCity University of Hong KongHong Kong 999077China Engineering Research Center of Materials Behavior and Design Ministry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the *** results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.

关键词： titanium alloy single crystal corrosion X-ray photoelectron spectroscopy

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Dual-strategy regulation for enhancing hydrogen storage performance of non-activated Mg8Ni-TiO2/MnO2 composites

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Journal of Energy Chemistry 2025年第4期103卷 543-555页

作者： Duode Zhao Xiaojiang Hou Chenlu Wang Danting Li Xinlei Xie Peixuan Zhu Xiaohui Ye Guoquan Suo Guang Yang Guangsheng Xu School of Material Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material Shaanxi University of Science and Technology College of Mechanical & Electrical Engineering Shaanxi University of Science and Technology Research Center of High-performance Aerospace Materials and Devices Shaanxi Polytechnic Institute

Magnesium-based materials are considered as among the most promising candidates for hydrogen storage,owing to their high storage capacity,safety,and ***,a passivation layer easily forms on the surface of magnesium,which hinders the dissociation and diffusion of *** dehydrogenation temperature,sluggish kinetics and activation difficulties hinder their commercial ***,dual-strategy regulation through nickel microalloying and surface catalysis of TiO2/MnO2catalysts has been proposed to obtain more active sites and diffusion channels that promote hydrogen dissociation and ***8Ni-X(X=None,TiO2,and TiO2/MnO2) can achieve more than 80% hydrogen absorption without ***8Ni-5 wt% TiO2/MnO2absorbs hydrogen 5.27 wt% in 30 s at 200℃and desorbs 5.15 wt% in 20 min at 325℃.The activation energy（Ea） of hydrogen absorption is 52.04kJ/*** results are significantly better than those of Mg8Ni and MgH2under the same *** NiTi phase is generated in the course of hydrogenation,and the coexistence of multiple phases and multivalent Ti facilitates the transport of electrons and *** dual-strategy regulation means of surface catalysis and microalloying is promising for the design of high-capacity fast hydrogen absorbed and desorbed materials without activation.

关键词： Hydrogen storage Mg8Ni Microalloying Thermodynamics TiO2/MnO2

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Multi-scale synergic optimization strategy for dielectric energy storage ceramics

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Journal of Advanced Ceramics 2023年第4期12卷 649-680页

作者： Xuhui Fan Jing Wang Hao Yua Zehan Zheng Ji Zhang Kongjun Zhu State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Materials Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

Dielectric capacitors,serving as the indispensable components in advanced high-power energy storage devices,have attracted ever-increasing attention with the rapid development of science and *** various dielectric capacitors,ceramic capacitors with perovskite structures show unique advantages in actual application,e.g.,excellent adaptability in high-temperature *** the optimization of their energy storage performance has become a hot research topic *** review presents the basic principles of energy storage in dielectric ceramics and introduces multi-scale synergic optimization strategies according to the key factors for superior energy storage *** summarizing the common points in numerous works,several universal modification strategies are reviewed,and future research on fatigue fracture of ceramic capacitors under multi-field including but not limited to force,electric,and thermal coupling conditions is also anticipated.

关键词： dielectric capacitors high-power energy storage multi-scale

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Enhancing Mg-Li alloy hydrogen storage kinetics by adding molecular sieve via friction stir processing

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Journal of materials science & Technology 2024年第13期180卷 45-54页

作者： Bin Li Xuan Sun Hao Chen Yan Yang Qun Luo Xiaohua Yang Yu'an Chen Guobing Wei Qian Li Fusheng Pan National Engineering Research Center for Magnesium Alloys&College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steel&School of Materials Science and Engineering&Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China School of Mechanical Engineering Sichuan UniversityChengdu 610065China

Mg-Li alloy is a lightweight hydrogen storage material with high hydrogen capacity,but its poor kinetics limited its practical *** this work,MCM-22 molecular sieve was added to Mg-Li alloy by friction stir processing(FSP)as the catalyst to enhance the kinetic properties of Mg-Li alloy(denoted as Mg-Li-MCM-22).The resulting Mg-Li-MCM-22 possesses the reversible hydrogen storage capacity of ca.6 wt.%and can release 5.62 wt.%hydrogen within 50 min at 623 K,showing improved *** Chou model and Johnson-Mehl-Avrami-Kolmogorov(JMAK)model calculations reveal that the lattice defects generated by FSP improve the kinetics of hydrogen adsorption/*** pinning effect of MCM-22 particles produces more grain boundaries and dislocations,thus,increasing the diffusion rate of hydrogen atoms and providing more nucleation sites,therefore,reducing the dehydrogenation activation *** work provides a new strategy for the preparation of hydrogen storage materials.

关键词： Mg-Li alloy Hydrogen storage Hydriding/dehydriding reaction kinetics Friction stir processing Molecular sieve

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