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Impact of annealing on structural and corrosion resistance properties of Ti_(20)Zr_(20)Hf_(20)Be_(20)Ni_(20)high-entropy metallic glass

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Rare Metals 2025年第1期44卷 565-580页

作者： Ke-Ran Li Pan Gong Dong-Liang Wang Cheng Zhang Hu Huang Muhammad Yasir Mao Zhang Xin-Yun Wang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057China Key Laboratory of CNC Equipment Reliability Ministry of EducationSchool of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130022China Department of Materials Science&Engineering Institute of Space TechnologyIslamabad 44000Pakistan

This study comprehensively investigates the effects of annealing on the structural,electrochemical properties and passivation film characteristics of Ti_(20)Zr_(20)Hf_(20)Be_(20)Ni_(20)(at%)high-entropy metallic glass(HE-MG).Subjected to various annealing temperatures,the samples were analyzed in a 3.5 wt%NaCl solution to evaluate changes in their microstructure and assess their corrosion *** reveal that the HE-MG undergoes multistage crystallization,displaying an amorphous matrix integrated with face centered cubic(FCC)and Ni_(7)Zr_(2)phases between 420 and 500℃,indicating robust thermal *** assessments identify a critical temperature threshold:Below the glass transition temperature(Tg),the HE-MG maintains excellent corrosion resistance,promoting stable passivation *** Tg,enhanced long-range atomic rearrangement during relaxation increases passivation layer defects and significantly diminishes corrosion resistance.X-ray photoelectron spectroscopy(XPS)analyses show that the primary components of the passivation layer are TiO_(2),ZrO_(2),HfO_(2)and *** annealing temperatures lead to enhanced Be and Ni content and decreased Ti,Zr and ***,high mixing entropy and significant atomic size mismatch suppress long-range atomic rearrangement and *** crystallization begins above Tg by_(20)℃,with crystalline phases evenly distributed within the matrix without drastically affecting corrosion *** investigation highlights the impact of thermal treatment on the properties of HE-MG,contributing valuable insights into optimizing their performance and applications.

关键词： High-entropy metallic glass Annealing Corrosion resistance Glass transition temperature Cluster

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PERFORMANCE EVALUATION OF HONEYCOMB FOAM CORE HYBRID SANDWICH COMPOSITES WITH VARYING FIBER REINFORCED POLYMER SKIN

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Composites: Mechanics, Computations, Applications 2024年第1期15卷 65-78页

作者： Kamaraj, M. Matthew, Samuel Navghare, Sarvesh Datta, Shubhabrata Centre for Composite and Advanced Materials Department of Mechanical Engineering Faculty of Engineering and Technology SRM Institute of Science and Technology Kattankulathur Tamil Nadu Chengalpattu603203 India

This research is an analysis of a unique high-density honeycomb foam named Lantor Soric, a flexible core material specifically used for resin infusion. To understand the full scope of this unique core material, it was bonded with various synthetic, natural, and hybrid face sheets. The glass, carbon, and jute fibers were utilized to prepare the face sheets, and epoxy was used as a binder. The sandwich composite samples were developed by a vacuum resin infusion technique. The performance of the sandwich composite, such as water absorption, flammability, and tensile and flexural strength, revealed that the addition of honeycomb foam to the composite structure improved the performance, such as water absorption, flammability, and tensile and flexural strength of the sandwich composite. The honeycomb foam was able to distribute the resin evenly throughout the laminate via its flow channels. Also, the hybrid composite of natural and synthetic fibers showed some astonishing properties in mechanical testing. The failure mechanism of the sandwich composite was inspected using scanning electron microscopy. Fractography revealed that the main mechanism for the failure was fiber pull out, voids, and interfacial debonding. © 2024 by Begell House, Inc. ***.

关键词： Foams

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Effect of austenitizing temperature on martensitic transformation in SA508Gr.4N steel

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Journal of materials science & Technology 2024年第19期186卷 244-255页

作者： Shumeng Lu Li Wan Shanju Zheng Mengnie Li Juanna Ren Baosheng Liu Manal F.Abou Taleb Zeinhom M.El-Bahy Zhongdong Xu Xiaojing Wang Mohamed M.Ibrahim Zhanhu Guo Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China Department of Materials Science and Engineering Inner Mongolia Zhongsheng Engineering Technology Co.Ltd.Alashan 750300China Department of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon TyneNE18STUK Department of Chemistry College of Science and Humanities in Al-KharjPrince Sattam Bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

SA508Gr.4 N steel is commonly used in nuclear pressure vessels. The current study discloses the impact of austenitizing temperature on its martensitic transformation. Various austenitizing temperatures were employed to examine the martensitic transformation at different experimental conditions. The characteristics of grain boundaries, microstructure, transformation kinetics, and crystallography of the martensitic phase following the austenitizing process and martensitic transformation were analyzed. Austenitizing temperatures had minimal effects on the critical temperature of the austenitizing phase transition. However, an increase in austenitizing temperature resulted in larger grain sizes. The phase composition primarily consisted of lath martensite, accompanied by a small amount of residual austenite (RA). As the austenitizing temperature increased, the temperature of martensite-start temperature (Ms) initially decreased and then increased. On the other hand, the temperature of martensite-finish (Mf) showed no significant sensitivity to changes in the austenitizing temperature. Moreover, the average size of the lath martensite structure was increased, and there was an increased tendency for variant selection as the austenitizing temperature increased, and the combination of specific orientation relationships appeared. This study is very valuable for revealing the microstructure evolution at different temperatures.

关键词： SA508Gr.4 N steel Austenitizing temperature Martensitic transformation Microstructures characteristics

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In-situ experiment tests and particulate simulations on powder paving process of additive manufacturing

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Particuology 2023年第3期74卷 164-172页

作者： Tan Cheng Hui Chen Qing Teng Qingsong Wei State Key Lab of Materials Forming and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore

In this work,in-situ experimental tests are first performed to investigate the powder spreading process of additive manufacturing,where different kinds of scrapers and spreading speeds are *** kinetic behaviours of individual powder particles are discussed by discrete element method *** is found that the decrease of inclination angle of the scraper improves the powder pressure and compaction in the spreading process,leading to a denser powder flow and thus a denser powder *** increase of spreading speed also improves the powder pressure and compaction in the spreading ***,the powder flow becomes looser due to the volume dilation,and thus the quality of the paved powder bed *** industrial applications,if the higher powder spreading speed is employed to improve the processing efficiency,the scraper with a smaller inclination angle can be used to ensure the powder bed quality.

关键词： Additive manufacturing Powder paving Packing quality Powder bed Inclination angle In-situ measurement

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EBSD Characterization of Microstructure and Micro-texture in a Friction Stir-Welded DP600 Steel

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 789-802页

作者： H.Ashrafi M.Shamanian M.Sanayei F.Farhadi J.A.Szpunar Faculty of Chemical and Materials Engineering Shahrood University of TechnologyShahrood***Iran Department of Materials Engineering Isfahan University of TechnologyIsfahan***Iran Department of Mechanical Engineering University of SaskatchewanSaskatoonSKS7N 5A9Canada Department of Materials Science and Engineering Worcester Polytechnic InstituteWorcesterMA01609USA

The microstructure and micro-texture in different areas of a friction stir(FS)-welded DP600 steel were investigated by means of electron backscatter *** volume fraction of martensite and non-polygonal ferrite was evaluated based on the image quality(IQ)*** of grain boundaries revealed that the fraction of sub-grain boundaries as well as that of low-angle grain boundaries in the heat-affected zone(HAZ)and stir zone(SZ)was more than doubled compared to those in the DP600 steel base metal(BM).The micro-texture examination of the BM showed strong{112}<110>and{111}<112>components with an intensity 4.6 times of that random *** texture showed a memory effect in the HAZ,with a reduced overall *** the SZ,D_(1),D_(2) and E shear texture components together with a cube component were *** of these texture components of ferrite were attributed to the transformation of B and R texture components of prior austenite,which are evidences of continuous dynamic recrystallization mechanism in the SZ of the friction stir-welded DP600 steel.

关键词： Dual phase steel Friction stir welding Micro-texture Image quality

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Improvement of interleaving Aramid pulp microfibers on compressive strengths of carbon fiber reinforced polymers with and without impact

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Chinese Journal of Aeronautics 2023年第10期36卷 459-470页

作者： Fei CHENG Guangming YANG Yunsen HU Bingyan YUAN Xiaozhi HU School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang 621010China Engineering Research Center of Biomass Materials Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China Department of Mechanical Engineering University of Western AustraliaPerth WA6009Australia

Compressive strengths and elastic moduli of Carbon Fiber Reinforced Polymer(CFRP)composites can be noticeably improved by multiple ultra-thin interlays with non-woven Aramid Pulp(AP)micro/nano-fibers.10-ply CFRP specimens with 0,2,4,6,8 g/m^(2)AP were tested under uniaxial *** flexible AP fibers,filling the resin-rich regions and further constructing the fiber bridging at the ply interfaces,can effectively suppress delamination growth and lead to very good improvements both in the compressive strength and the elastic *** CFRP specimen with an optimum interlay thickness has a distinct shear failure mode instead of the typical delamination cracking along the direction of continuous carbon *** Strengths After Impacts(CAI)of 12.35 J were also measured,up to 90%improvement in CAI has been *** is concluded those ultra-thin interlays of non-woven AP micro/nano-fibers are beneficial to design and manufacture“high strength”CFRP composites.

关键词： Compressive strength Carbon Fiber Reinforced Polymer(CFRP) Aramid pulp Interleaving Interfacial reinforcing

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Wear Mechanism and Electrochemical Properties of Different Interlayers on DLC Film Deposited by PECVD Technique

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Journal of Bio- and Tribo-Corrosion 2024年第2期10卷 1-12页

作者： Asadian, Keivan Samiee, Mohsen Mafi, Majid Department of Semiconductors Materials and Energy Research Center Karaj Iran Department of Metallurgy and Materials Engineering Islamic Azad University Karaj Branch Karaj Iran Mechanical Engineering Department Iran University of Science and Technology Tehran Iran

This research is an attempt to coat diamond-like carbon (DLC) thin films on AISI 420 stainless steel substrate by plasma-enhanced chemical vapor deposition (PECVD). The plasma nitriding process and the creation of a zirconium nitride (ZrN) layer were used to increase the adhesion of the coating to the substrate. Microstructural studies using field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM) showed that all the coatings contained no porosity and were completely dense so that the mean surface roughness (Ra) of the ZrN-DLC coating was 3.02 nm. The corrosion polarization test showed that applying the coatings improved the corrosion resistance i.e., the corrosion current density of the ZrN-DLC sample was 3.6 × 10–8 A/cm2, which was at least 1000 times better than that of the substrate. The samples contained DLC exhibited improved wear behavior than other samples. The plasma-nitrided DLC sample was the best in the wear test, so much so that the DLC in this sample was able to prevent the transfer to the abrasive mechanism. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Corrosion resistance

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Tertiary orientation structures enhance the piezoelectricity of MXene/PVDF nanocomposite

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Nano Research 2024年第6期17卷 5629-5635页

作者： Yong Ao Tao Yang Guo Tian Shenglong Wang Tianpei Xu Lin Deng Jieling Zhang Lihua Tang Weili Deng Long Jin Weiqing Yang Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Department of Mechanical Engineering The University of AucklandAuckland 1010New Zealand Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031China

With the increasing demand for flexible piezoelectric sensor components,research on polyvinylidene fluoride(PVDF)based piezoelectric polymers is mounting ***,the low dipole polarization and disordered polarization direction presented in PVDF hinder further improvement of piezoelectric ***,we constructed an oriented tertiary structure,consisting of molecular chains,crystalline region,and MXene sheets,in MXene/PVDF nanocomposite via a temperature-pressure dual-field regulation *** highly oriented PVDF molecular chains form approximately 90%of theβ*** addition,the crystalline region structure with long-range orientation achieves out of plane polarization *** parallel orientation arrangement of MXene effectively enhances the piezoelectric performances of the nanocomposite,and the current output of the device increases by nearly 23 *** high output device is used to monitor exercise action,exploring the potential applications in wearable electronics.

关键词： flexible sensor piezoelectric MXene/polyvinylidene fluoride(PVDF)nanocomposite orientation structures

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Automating selective area electron diffraction phase identification using machine learning

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Journal of Materiomics 2024年第4期10卷 896-905页

作者： M.Mika N.Tomczak C.Finney J.Carter A.Aitkaliyeva Nuclear Engineering Program in Department of Materials Science University of Florida100 Rhines HallGainesville32611FLUSA Department of Materials Science&Engineering Case Western Reserve University2111 Martin Luther King Jr DrCleveland44106OHUSA

Selective area electron diffraction(SAED)patterns can provide valuable insight into the structure of a ***,the manual identification of collected patterns can be a significant bottleneck in the overall phase classification *** this work,we utilize the recent advances in computer vision and machine learning(ML)to automate the indexing of SAED *** performance of six different ML algorithms is demonstrated using metallic plutonium-zirconium *** most successful approach trained a neural network(NN)to make a classification of the phase and zone axis,and then utilized a second NN to synthesize multiple independent predictions of different tilts in a single sample to make an overall phase *** results demonstrate that automated SAED phase identification using ML is a viable route to accelerate materials characterization.

关键词： Selective area electron diffraction Machine learning Phase identification Metallic fuels Pu alloys

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Efficient predictions of formation energies and convex hulls from density functional tight binding calculations

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Journal of materials science & Technology 2023年第10期141卷 236-244页

作者： Anshuman Kumar Zulfikhar A.Ali Bryan M.Wong Materials Science&Engineering Program University of California-RiversideRiverside92521CAUSA Department of Physics&Astronomy University of California-RiversideRiverside92521CAUSA Materials Science&Engineering Program Department of Chemical&Environmental EngineeringDepartment of Physics&Astronomyand Department of ChemistryUniversity of California-RiversideRiverside92521CAUSA

Defects in materials significantly alter their electronic and structural properties,which affect the per-formance of electronic devices,structural alloys,and functional ***,calculating all the possible defects in complex materials with conventional Density Functional Theory(DFT)can be compu-tationally *** enhance the efficiency of these calculations,we interfaced Density Functional Tight Binding(DFTB)with the Clusters Approach to Statistical Mechanics(CASM)software package for the first *** SiC and ZnO as representative examples,we show that DFTB gives accurate results and can be used as an efficient computational approach for calculating and pre-screening formation ener-gies/convex *** DFTB+CASM implementation allows for an efficient exploration(up to an order of magnitude faster than DFT)of formation energies and convex hulls,which researchers can use to probe other complex systems.

关键词： CASM DFTB DFT Formation energy Convex hull

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