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20th CIRP Conference on Modeling of Machining Operations in Mons, CIRP CMMO 2025

作者： Adeeb, Syed Ahsan Karpat, Yigit Bilkent University Department of Industrial Engineering Ankara06800 Turkey Bilkent University Department of Mechanical Engineering Ankara06800 Turkey UNAM-Institute of Materials Science and Nanotechnology Ankara06800 Turkey

In plunging-Type tests, a cutting tool is given a sinusoidal movement as the work material with a web on its surface is rotated at a constant speed. If the amplitude and feed rate of the cutting tool and rotational speed of the work material are correctly set, the plunging test can be completed within a full rotation. As a result, a detailed investigation of different episodes of micro-scale machining, such as rubbing, plowing, and shearing, can be conducted with a single test. Combined with force measurements and cut chip morphology, the process mechanics can be investigated in detail. This study conducted plunging tests on an ultra-precision CNC with a diamond cutting tool on commercially pure titanium alloy. The differences in tangential and normal forces observed during plunge-in and pull-out periods corresponding to the same amplitude were analyzed using an analytical model. Resultant forces during the pull-out phase are larger than those observed in the plunge-in phase, attributed to an increase in cut chip thickness. A computational model of the plunging-Type experiment has also been developed based on the findings of the analytical model. The proposed hybrid approach may be useful to improve identification of material constitutive model parameters based on micro scale machining experiments. © 2025 The Authors.

关键词： Titanium alloys

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Effect of Pre-deformation on Nanoscale Precipitation and Hardness of a Maraging Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2089-2100页

作者： Xinlei Zhou Bin Wang Tianyi Zeng Wei Yan Junhua Luan Wei Wang Ke Yang Zengbao Jiao School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China Department of Materials Science and Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

The effect of pre-deformation on nanoscale precipitates and hardness of a maraging stainless steel strengthened by the coprecipitation of Ni_(3)Ti,Mo-enriched and Cr-enriched precipitates was systematically studied using electron back scattered diffraction,transmission electron microscopy and atom probe tomography(APT).Hardness measurements showed that the hardness of specimen with a deformation ratio of 90%peaked at HV 718 aged for 24 h,which is higher than that in the undeformed specimen(HV 603)aged for 72 h at 480℃.APT characterization revealed that pre-deformation could shorten the incubation time of the Mo-enriched and Cr-enriched *** the early-aged stage,pre-deformation increased the stain energy that inhibited the nucleation of Ni_(3)Ti precipitates,but accelerated the rejection of Mo from Ni-Ti ***,the strengthening model indicated that strain hardening(43%)makes a larger contribution to the hardness at the early-aged condition,while precipitation hardening(58%)has most contribution to the hardness at the peak-aged conditition.

关键词： Maraging stainless steel Pre-deformation Precipitation hardening Atom probe tomography

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Radiopaque FeMnN-Mo composite drawn filled tubing wires for braided absorbable neurovascular devices

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Bioactive materials 2024年第10期40卷 74-87页

作者： Adam J.Griebel Petra Maier Henry Summers Benjamin Clausius Isabella Kanasty Weilue He Nicholas Peterson Carolyn Czerniak Alexander A.Oliver David F.Kallmes Ramanathan Kadirvel Jeremy E.Schaffer Roger J.GuilloryⅡ Fort Wayne Metals Fort WayneINUSA School of Mechanical Engineering Stralsund University of Applied SciencesStralsundDEUSA Department of Materials Science and Engineering Michigan Technological UniversityUSA Department of Biomedical Engineering Michigan Technological UniversityUSA Department of Biological Sciences Michigan Technological UniversityUSA Joint Department of Biomedical Engineering Medical College of WisconsinMarquette UniversityUSA Department of Radiology Mayo ClinicRochesterMNUSA Department of Neurosurgery Mayo ClinicRochesterMNUSA

Flow diverter devices are small stents used to divert blood flow away from aneurysms in the brain,stagnating flow and inducing intra-aneurysmal thrombosis which in time will prevent aneurysm *** devices are formed from thin(~25μm)wires which will remain in place long after the aneurysm has been *** their continued presence could lead to secondary complications,an absorbable flow diverter which dissolves into the body after aneurysm occlusion is *** absorbable metals investigated to date struggle to achieve the necessary combination of strength,elasticity,corrosion rate,fragmentation resistance,radiopacity,and *** work proposes and investigates a new composite wire concept combining absorbable iron alloy(FeMnN)shells with one or more pure molybdenum(Mo)*** wire configurations are produced and drawn to 25–250μm *** testing revealed high and tunable mechanical properties on par with existing flow diverter *** vitro degradation testing of 100μm wire in DMEM to 7 days indicated progressive corrosion and cracking of the FeMnN shell but not of the Mo,confirming the cathodic protection of the Mo by the FeMnN and thus mitigation of premature fragmentation *** vivo implantation and subsequentμCT of the same wires in mouse aortas to 6 months showed meaningful corrosion had begun in the FeMnN shell but not yet in the Mo filament *** total,these results indicate that these composites may offer an ideal combination of properties for absorbable flow diverters.

关键词： corrosion composite filled

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Study of Cu Effect and In-situ Yttria Dispersoids on Microstructure Evolution of mechanically Alloyed CoFeNiCrCu High Entropy Alloys

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Metals and materials International 2023年第2期29卷 420-428页

作者： Suprianto Chen, Chun-Liang Department of Materials Science and Engineering National Dong Hwa University No. 1 Sec. 2 Da Hsueh Rd Shoufeng Hualien97401 Taiwan Faculty of Engineering Department of Mechanical Engineering Universitas Sumatera Utara Padang bulan Medan20155 Indonesia

Abstract: The role of Cu and Y on characteristics of the FeCoNiCrCu HEAs synthesized by mechanical alloying was studied. The XRD results suggest that the addition of Cu promotes the formation of the FCC1 and FCC2 phases. The elemental segregation of Cu around the Cr-rich oxide clusters was also observed, indicating the phase decomposition and dissolution of Cu into cluster oxides during high-temperature sintering. Moreover, the presence of the ductile Cu alters the alloying behavior of the materials during ball milling, thereby restricting the formability of Cr-rich oxides. Besides, the high content of yttrium addition can encourage the formation of in-site Y dispersoids, which plays an important role in determining the microstructure refinement and homogeneity. Hence, their mechanical properties can further be greatly improved. Graphical Abstract: [Figure not available: see fulltext.]. © 2022, The Author(s) under exclusive licence to The Korean Institute of Metals and materials.

关键词： mechanical alloying

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Tetris-Style Stacking Process to Tailor the Orientation of Carbon Fiber Scaffolds for Efficient Heat Dissipation

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Nano-Micro Letters 2023年第9期15卷 310-324页

作者： Shida Han Yuan Ji Qi Zhang Hong Wu Shaoyun Guo Jianhui Qiu Fengshun Zhang The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065People’s Republic of China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural University015-0055AkitaJapan Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900People’s Republic of China

As the miniaturization of electronic devices and complication of electronic packaging,there are growing demands for thermal interfacial materials with enhanced thermal conductivity and the capability to direct the heat toward heat sink for highly efficient heat ***-based carbon fiber(CF)with ultrahigh axial thermal conductivity and aspect ratios exhibits great potential for developing thermally conductive composites as ***,it is still hard to fabricate composites with aligned carbon fiber in a general approach to fully utilize its excellent axial thermal conductivity in specific ***,three types of CF scaffolds with different oriented structure were developed via magnetic field-assisted Tetris-style stacking and carbonization *** regulating the magnetic field direction and initial stacking density,the self-supporting CF scaffolds with horizontally aligned(HCS),diagonally aligned and vertically aligned(VCS)fibers were *** embedding the polydimethylsiloxane(PDMS),the three composites exhibited unique heat transfer properties,and the HCS/PDMS and VCS/PDMS composites presented a high thermal conductivity of 42.18 and 45.01 W m^(−1)K^(−1)in fiber alignment direction,respectively,which were about 209 and 224 times higher than that of *** excellent thermal conductivity is mainly ascribed that the oriented CF scaffolds construct effective phonon transport pathway in the *** addition,fishbone-shaped CF scaffold was also produced by multiple stacking and carbonization process,and the prepared composites exhibited a controlled heat transfer path,which can allow more versatility in the design of thermal management system.

关键词： Carbon fiber Magnetic field Thermal management Thermally conductive composites

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Optothermal multimodal manipulation of micro/nanoparticles

Optothermal multimodal manipulation of micro/nanoparticles

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Ding, Hongru Kollipara, Pavana Siddhartha Yao, Kan Zheng, Yuebing Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science & Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

ISBN: (纸本)9781957171258

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On the oxidation and interdiffusion behavior of an AlCoCrFeNiY high-entropy alloy bond coat on a directionally solidified Ni-based superalloy

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Journal of materials science & Technology 2024年第19期186卷 64-78页

作者： Xuanzhen Liu Ying Chen Ling Li Aihui Huang Han Zhang Xiancheng Zhang Jie Lu Xiaofeng Zhao Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Materials The University of ManchesterManchester M139PLUnited Kingdom The Henry Royce Institute The University of ManchesterManchester M139PLUnited Kingdom Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

The oxidation and interdiffusion behavior of a novel AlCoCrFeNiY bond coat deposited on a directionally solidified Ni-based superalloy were systematically studied at 1050,1100 and 1150°C,and compared with a conventional NiCoCrAlY coating deposited on the same *** AlCoCrFeNiY bond coat exhibits lower oxide growth rates due to its large columnar grains and low Al activity at the oxide scale/bond coat ***,AlCoCrFeNiY has higher resistance to oxide spallation than NiCoCrAlY,which is attributed to the formation of a clean and defect-free metal/oxide *** interdiffusion occurs across the AlCoCrFeNiY/superalloy substrate *** experimental evidence and thermody-namic modelling suggest that Fe accelerates interdiffusion and destabilizes theγ’phase,thereby causing the formation of a thick andγ’-depleted interdiffusion *** addition,the AlCoCrFeNiY bond coat un-dergoes more Al depletion and subsequentβtoγtransformation compared with *** on the findings in this work,a novel AlCoCrFeNiY/NiCoCrAlY double-layer bond coat was designed,tested and validated to achieve optimal balance between oxidation and interdiffusion.

关键词： AlCoCrFeNi bond coat Directionally solidified Ni-based superalloy Oxidation Interdiffusion High velocity air-fuel spraying

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Novel Zr-doped β-Li_(3)PS_(4) solid electrolyte for all-solid-state lithium batteries with a combined experimental and computational approach

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Nano Research 2023年第2期16卷 3516-3523页

作者： Junbo Zhang Guoxi Zhu Han Li Jiangwei Ju Jianwei Gu Renzhuang Xu Sumin Jin Jianqiu Zhou Bingbing Chen Department of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Energy Science and Engineering Nanjing Tech UniversityNanjing 211816China

All-solid-state lithium batteries(ASSLBs)are promising for safety and high-energy-density large-scale energy *** this contribution,we propose a Li_(3–4x)Zr_(x)PS_(4)(LZPS)by Zr-dopedβ-Li_(3)PS_(4)(LPS)as a novel solid electrolyte(SE)for ASSLBs based on experimental and simulation *** structure,electronic property,mechanical property,and ionic transport properties of LZPS(x=0,0.03,0.06,and 0.1)are investigated with first-principles ***,LZPS is prepared by solid states reaction *** combining experimental analysis and first-principles calculations,it is confirmed that a small amount of Zr4+can be successfully doped into the framework ofβ-LPS composites without significantly compromising structural *** the Zr^(4+)concentration is x=0.03,the doped material Li_(2.88)Zr_(0.03)PS_(4)exhibits the highest ionic conductivity(5.1×10^(−4)S·cm^(−1))at 30℃,and the Li-ion migration energy barrier is the *** Li_(2.88)Zr_(0.03)PS_(4)SE has obtained the best mechanical properties,the good ductility,and shear deformation resistance,which can better maintain the structural stability of the *** addition,the Li/Li symmetrical cell is assembled,which shows excellent electrochemical stability of electrolyte against *** constructed all-solid-state batteries(LiCoO_(2)-Li_(6)PS_(5)Cl|Li_(2.88)Zr_(0.03)PS_(4)|Li-In)delivers an initial discharge capacity of 130.4 mAh·g^(−1)at 0.2 C and a capacity retention of 85.1%after 100 cycles at room *** study provides a promising electrolyte for the application of ASSLBs with high ionic conductivity and excellent stability against lithium.

关键词： all-solid-state lithium batteries first-principles calculations high ionic conductivity interface stability

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Exfoliation of bulk 2H-MoS_(2)into bilayer 1T-phase nanosheets via ether-induced superlattices

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Nano Research 2024年第6期17卷 5705-5711页

作者： Xiuling Shi Dongmei Lin Zhuorui Xiao Yibo Weng Hanxiang Zhou Xiaoying Long Zhiyu Ding Fuyuan Liang Yan Huang Guohua Chen Kaikai Li Tong-Yi Zhang School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHong KongChina School of Energy and Environment City University of Hong KongTat Chee AvenueKowloonHong KongChina The Hong Kong University of Science and Technology(Guangzhou) Guangzhou Municipal Key Laboratory of Materials InformaticsAdvanced Materials Thrust and Sustainable Energy and Environment ThrustNanshaGuangzhou 511400China

The exfoliation of bulk 2H-molybdenum disulfide(2H-MoS_(2))into few-layer nanosheets with 1T-phase and controlled layers represents a daunting challenge towards the device applications of MoS_(2).Conventional ion intercalation assisted exfoliation needs the use of hazardous n-butyllithium and/or elaborate control of the intercalation potential to avoid the decomposition of the MoS_(2).This work reports a facile strategy by intercalating Li ions electrochemically with ether-based electrolyte into the van der Waals(vdW)channels of MoS_(2),which successfully avoids the decomposition of MoS_(2)at low *** co-intercalation of Li+and the ether solvent into MoS_(2)makes a first-order phase transformation,forming a superlattice phase,which preserves the layered structure and hence enables the exfoliation of bulk 2H-MoS_(2)into bilayer nanosheets with *** with the pristine 2H-MoS_(2),the bilayer 1T-MoS_(2)nanosheets exhibit better electrocatalytic performance for the hydrogen evolution reaction(HER).This facile method should be easily extended to the exfoliation of various transition metal dichalcogenides(TMDs).

关键词： exfoliation of MoS_(2) phase transformations superlattices ether electrolyte hydrogen evolution reaction(HER)

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Emission measurements and in-situ observation of ionic liquid electrospray thrusters with longitudinally grooved emitters

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Journal of Electric Propulsion 2023年第1期2卷 23页

作者： Matsukawa, Koki Nakashima, Yuiko Naemura, Momoko Takao, Yoshinori Department of Mechanical Engineering Materials Science and Ocean Engineering Yokohama National University Kanagawa Yokohama240–8501 Japan Division of Systems Research Yokohama National University Kanagawa Yokohama240–8501 Japan

An externally wetted emitter array with longitudinally grooved structures for ionic liquid electrospray thrusters was fabricated to improve ionic liquid transport to the emitter tips. Two grooved emitter shapes with different groove depths were successfully fabricated using microelectromechanical system processing techniques. We evaluated the current–voltage characteristics, measured the mass spectra using time-of-flight (ToF) spectrometry, and conducted in-situ observations using a high-speed microscope. The experimental results of ion emission show that the absolute emission current increases compared with that of our previous emitter without grooves. This tendency is strengthened with deeper grooves. Moreover, the slope of the current–voltage curve for the grooved emitters does not decrease even when high voltages are applied, indicating that the grooved structure improves the ionic liquid transport to the emitter tips. This improvement is attributed to the low hydraulic impedance of the emitter structure. However, deeper grooving also increases the percentage of current intercepted by the extractor electrode, and electrochemical reactions are not avoided at an alternation frequency of 1 Hz. Although the first current–voltage measurement tended to have unstable characteristics, the ToF results indicated that the emission in the center line was in the pure-ion regime, composed mostly of monomer and dimer ions, under all the measured conditions. High-speed microscope observations showed that too much ionic liquid deposited on the extractor causes ion emission from the extractor to the emitter, known as backspray, and implies that no large droplets are emitted for either grooved emitter structure, which is consistent with the ToF results. © The Author(s) 2023.

关键词： Ion propulsion

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