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The mechanisms of grain growth of Mg alloys:A review

Journal of Magnesium and Alloys 2022年第9期10卷 2384-2397页

作者： Qinghua Chen Ruinan Chen Jian Su Qingsong He Bin Tan Chao Xu Xu Huang Qingwei Dai Jian Lu School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China Department of Mechanical Engineering City University of Hong KongHong KongChina

Grain growth directly influences the plasticity and strength of Mg *** the grain size decreases from the microscale to the nanoscale,the plasticity of Mg alloys continually increases,whereas the strength first increases and later *** trends are observed because the plastic deformation mechanism changes from dislocation–twinning dominance to grain boundary *** this study,the factors influencing grain growth,such as the temperature of plastic deformation/annealing,second-phase particles and solute atoms,are examined to aid effective control of the grain ***,the mechanisms of grain growth,typically induced by strain and thermal activation,are ***-induced grain boundary migration is attributable to the difference in the strain energy stored in adjacent grains with high-density ***-induced grain boundary migration is driven by the difference in the energy of the grain boundary/subgrain boundary and boundary *** grain growth can be induced by anisotropy of the strain energy,anisotropy of the grain boundary mobility,depinning of the second phase and high misorientation gradient.

关键词： Mg alloys Grain growth mechanical properties Microstructure

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A state-of-the-art review of the fabrication and characteristics of titanium and its alloys for biomedical applications

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Bio-Design and Manufacturing 2022年第2期5卷 371-395页

作者： Masoud Sarraf Erfan Rezvani Ghomi Saeid Alipour Seeram Ramakrishna Nazatul Liana Sukiman Centre of Advanced Materials Department of Mechanical EngineeringFaculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Department of Materials Science and Engineering Sharif University of TechnologyAzadi Ave.P.O.Box 11365‑9466TehranIran Center for Nanotechnology and Sustainability Department of Mechanical EngineeringNational University of SingaporeSingapore 117581Singapore

Commercially pure titanium and titanium alloys have been among the most commonly used materials for biomedical applications since the 1950 *** to the excellent mechanical tribological properties,corrosion resistance,biocompatibility,and antibacterial properties of titanium,it is getting much attention as a biomaterial for ***,titanium promotes osseointegration without any additional adhesives by physically bonding with the living bone at the implant *** properties are crucial for producing high-strength metallic alloys for biomedical *** alloys are manufactured into the three types ofα,β,andα+β.The scientific and clinical understanding of titanium and its potential applications,especially in the biomedical field,are still in the early *** review aims to establish a credible platform for the current and future roles of titanium in *** first explore the developmental history of ***,we review the recent advancement of the utility of titanium in diverse biomedical areas,its functional properties,mechanisms of biocompatibility,host tissue responses,and various relevant antimicrobial *** research will be directed toward advanced manufacturing technologies,such as powder-based additive manufacturing,electron beam melting and laser melting deposition,as well as analyzing the effects of alloying elements on the biocompatibility,corrosion resistance,and mechanical properties of ***,the role of titania nanotubes in regenerative medicine and nanomedicine applications,such as localized drug delivery system,immunomodulatory agents,antibacterial agents,and hemocompatibility,is investigated,and the paper concludes with the future outlook of titanium alloys as biomaterials.

关键词： Titanium and titanium alloys Biomedical application Functional properties Biocompatibility Antibacterial activity Advanced manufacturing

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Dynamic crushing behavior and energy absorption of hybrid auxetic metamaterial inspired by Islamic motif art

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Applied Mathematics and Mechanics(English Edition) 2023年第3期44卷 345-362页

作者： Ruilan TIAN Huaitong GUAN Xuhao LU Xiaolong ZHANG Huanan HAO Wenjie FENG Guanglei ZHANG Department of Engineering Mechanics Hebei Key Laboratory of Mechanics of Intelligent Materials and StructuresShijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Materials Science and Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Auxetic honeycomb structures are promising metamaterials with outstanding mechanical properties,and can be potentially used in energy absorption *** this study,a novel modified re-entrant hybrid auxetic metamaterial inspired by Islamic motif art is designed by integrating four-pointed double re-entrant motifs with symmetric semi-hexagonal unit cells to achieve a high energy absorption capacity(EAC).Theoretical analyses and numerical simulations are performed to examine the dynamic crushing behavior of the four-pointed double re-entrant combined structure(FDRCS).The developed finite element models(FEMs)are validated by the experiments under quasi-static *** deformation mode and stress-strain curves are further studied under low,medium,and high crushing *** theoretically predicted plateau stress of the FDRCS under different crushing velocities is consistent with the numerical simulation *** crushing stress and the EAC of the FDRCS are influenced by the geometric parameters and crushing *** FDRCS exhibits a negative Poisson's ratio(NPR),owing to the four-point re-entrant structure(RES).Moreover,the specific energy absorption(SEA)of these structures is higher than that of nonauxetic hexagonal and auxetic re-entrant structures,owing to the generation of more plastic hinges that dissipate more energy during dynamic crushing.

关键词： re-entrant honeycomb auxetic hybrid metamaterial energy-absorption dynamic crushing

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Simultaneously improving mechanical properties and oxidation resistance of Ti-bearing high-entropy superalloys at intermediate temperature via silicon addition

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Journal of materials science & Technology 2023年第26期157卷 30-41页

作者： Shaofei Liu Weicheng Xiao Bo Xiao Jiang Ju Yinghao Zhou Yilu Zhao Zengbao Jiao Junhua Luan Qian Li Jinxiong Hou Ji-jung Kai Tao Yang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Hong Kong Institute for Advanced Study City University of Hong KongHong Kong 999077China

Ti-bearing high-entropy superalloys(HESAs)often suffer from severe intergranular embrittlement and terrible oxidation degradation at intermediate *** we showcase that minor Si addition can effectively mitigate the intergranular embrittlement and improve the oxidation resistance of the a(Ni_(2)Co_(2)FeCr)_(92) Ti_(4)Al_(4) HESA at 700℃ *** analysis revealed that the intergranu-lar G phase induced by 2 at%Si addition can effectively suppress the inward diffusion of oxygen along grain boundaries at 700℃,thus enhancing the tensile ductility of the alloy from∼8.3%to∼13.4%.Be-sides,the 2 at%Si addition facilitated the formation of a continuous Al_(2)O_(3) layer during oxidation,con-tributing to a remarkable reduction in the growth rate of the oxide scale to a quarter of the Si-free *** results demonstrate that Si can be a favorable alloying element to design advanced HESAs with syn-ergistically improved thermal-mechanical performance.

关键词： High-entropy superalloy mechanical property Oxidation behavior Intermediate temperature Silicon addition

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ENHANCING PHOTOVOLTAIC SOLAR PANEL EFFICIENCY VIA COMPUTATIONAL FLUID DYNAMICS (CFD) COOLING ANALYSIS

ENHANCING PHOTOVOLTAIC SOLAR PANEL EFFICIENCY VIA COMPUTATIO...

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ASME 2024 International mechanical engineering Congress and Exposition, IMECE 2024

作者： Azari, Fatemeh Jazaei, Robabeh Gharehdaghi, Samad Department of Mechanical Engineering and Materials Science College of Engineering University of Pittsburgh PittsburghPA United States Department of Physics and Engineering College of Engineering and Science Slippery Rock University Slippery RockPA United States Department of Mechanical Engineering Technology College of Polytechnic Purdue University Fort WayneIN United States

ISBN: (纸本)9780791888681

This paper computationally evaluates the effectiveness of integrating fins in increasing the efficiency of Photovoltaic Solar Systems. Building on previous Finite Element Analysis (FEA) that contrasted the performance of bare panels against those equipped with rectangular and cylindrical heat sinks, this investigation primarily concentrates on Computational Fluid Dynamics (CFD) models executed within ANSYS Fluent. Through simulations under laminar and turbulent conditions, characterized by Reynolds numbers of approximately 2000 and 6000, respectively, the study introduces significant simplifications by considering a solitary PV layer, a single fin, and a fluid domain. This approach significantly economizes computational resources. Comparative analysis with FEA data indicates that bare panels and panels with pin fins achieved efficiencies of 14.63% and 19.34%, respectively, underscoring the efficacy of utilizing water as a coolant and optimizing flow velocity. Additionally, results reveal that the laminar and turbulent CFD models exhibit average temperatures of 25.19°C and 25.18°C, respectively, correlating to the efficiency of 19.71% thereby marking an insignificant uptick from the turbulent to the laminar model. © 2024 by ASME.

关键词： Computational fluid dynamics

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Optimized CeO_(2) Nanowires with Rich Surface Oxygen Vacancies Enable Fast Li-Ion Conduction in Composite Polymer Electrolytes

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Energy & Environmental materials 2023年第1期6卷 218-223页

作者： Lu Gao Nan Wu Nanping Deng Zhenchao Li Jianxin Li Yong Che Bowen Cheng Weimin Kang Ruiping Liu Yutao Li State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes School of Textile Science and EngineeringTiangong UniversityTianjin 300387China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustin TX 78712USA Department of Materials of Science and Engineering China University of Mining and Technology(Beijing)Beijing 100083China Enpower Energy Corp. Beijing 102600China

Low-cost and flexible solid polymer electrolytes are promising in all-solid-state Li-metal batteries with high energy density and ***,both the low room-temperature ionic conductivities and the small Li^(+)transference number of these electrolytes significantly increase the internal resistance and overpotential of the ***,we introduce Gd-doped CeO_(2) nanowires with large surface area and rich surface oxygen vacancies to the polymer electrolyte to increase the interaction between Gd-doped CeO_(2) nanowires and polymer electrolytes,which promotes the Li-salt dissociation and increases the concentration of mobile Li ions in the composite polymer *** optimized composite polymer electrolyte has a high Li-ion conductivity of 5×10^(-4)4 S cm^(-1) at 30℃ and a large Li+transference number of ***,the composite polymer electrolytes have excellent compatibility with the metallic lithium anode and high-voltage LiNi_(0.8)Mn _(0.1)Co_(0.1)O_(2)(NMC)cathode,providing the stable cycling of all-solid-state batteries at high current densities.

关键词： composite polymer electrolytes,Gd-doped CeO_(2)nanowires Li-ion conduction oxygen vacancies surface interaction

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Resilient Polymer Nanocomposites for Type II Thermal Interface materials 23

Resilient Polymer Nanocomposites for Type II Thermal Interfa...

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23rd IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2024

作者： Pokhrel, Geeta Howarter, John A. Wilson, Michael C. Davis, Chelsea S. Purdue University School of Materials Engineering West LafayetteIN47907 United States University of Delaware Department of Mechanical and Materials Science and Engineering NewarkDE19716 United States

ISBN: (纸本)9798350364330

Thermal interface materials (TIMs) in electronics are typically used between the heat source and heat sink to enhance heat dissipation. TIMs are continuously exposed to harsh conditions such as temperature cycling, mechanical stress, humidity, vibration, and shock, which can lead to failure and hinder efficient thermal conduction. Both thermal and mechanical properties are equally important for electronic reliability and performance. However, mechanical properties are often overlooked in the literature compared to thermal properties. This study emphasizes the fabrication of TIMs based on thermoplastic elastomer (TPE) nanocomposites with mechanical robustness and sufficient thermal conductivity. The form factor of the TIM is Type II, an elastomeric thermal pad. mechanical robustness in the TIMs is achieved through triblock copolymers of polystyrene-block-polyisoprene-block-polystyrene (SIS). Thermal conductivity of these robust films is enhanced by incorporating functionalized 2D hexagonal boron nitride (BN) nanoplatelets. Above 20 vol.% BN, both in plane and cross plane thermal conductivities decrease. Additionally, the incorporation of the nanoplatelets increases surface roughness, elastic modulus, and mechanical hysteresis. We observe that an increase in nanofiller content negatively impacts mechanical performance without necessarily improving thermal conductivity. Thus, understanding the balance of mechanical and thermal performance is critical for optimization. The results obtained through this research can offer valuable insights for designing elastomeric thermal pads. © 2024 IEEE.

关键词： Nanocomposites

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Flash‑Induced High‑Throughput Porous Graphene via Synergistic Photo‑Effects for Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第11期15卷 1-18页

作者： Jin Soo Lee Jeong‑Wook Kim Jae Hee Lee Yong Koo Son Young Bin Kim Kyoohee Woo Chanhee Lee Il‑Doo Kim Jae Young Seok Jong Won Yu Jung Hwan Park Keon Jae Lee Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑roYuseong‑guDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑roYuseong‑guDaejeon 34141Republic of Korea Department of Printed Electronics Nano‑Convergence Manufacturing Systems Research DivisionKorea Institute of Machinery and Materials(KIMM)156 Gajeongbuk‑RoYuseong‑GuDaejeon 34103Republic of Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology232 Gongneung‑roNowon‑guSeoul 01811Republic of Korea Department of Mechanical Engineering(Department of Aeronautics Mechanical and Electronic Convergence Engineering)Kumoh National Institute of Technology61 Daehak‑roGumiGyeongbuk 39177Republic of Korea

Porous 2D materials with high conductivity and large surface area have been proposed for potential electromagnetic interference(EMI)shielding materials in future mobility and wearable applications to prevent signal noise,transmission inaccuracy,system malfunction,and health ***,we report on the synthesis of lightweight and flexible flash-induced porous graphene(FPG)with excellent EMI shielding *** broad spectrum of pulsed flashlight induces photo-chemical and photo-thermal reactions in polyimide films,forming 5×10 cm^(2)-size porous graphene with a hollow pillar structure in a few *** resulting material demonstrated low density(0.0354 g cm^(−3))and outstanding absolute EMI shielding effectiveness of 1.12×10^(5) dB cm^(2) g^(−1).The FPG was characterized via thorough material analyses,and its mechanical durability and flexibility were confirmed by a bending cycle ***,the FPG was utilized in drone and wearable applications,showing effective EMI shielding performance for internal/external EMI in a drone radar system and reducing the specific absorption rate in the human body.

关键词： Porous graphene Flash lamp Photo-pyrolysis High-throughput Electromagnetic interference shielding

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Multi-objective parametric modelling during wire-cut electric discharge machining of Incoloy 800H 6

Multi-objective parametric modelling during wire-cut electri...

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6th International Conference on Advancements in materials and Manufacturing, ICAAMM 2024

作者： Reddy Paturi, Uma Maheshwera Sahasra Bhojane, Omkar Sunil Reddy, Goturi Sheshank Vamshi, Nudurupati Achintya Nandan, Konidhala Reddy, N.S. Department of Mechanical Engineering CVR College of Engineering Telangana Hyderabad501510 India School of Materials Science and Engineering Gyeongsang National University Jinju52828 Korea Republic of

Incoloy 800H exhibits exceptional resistance to corrosion in aqueous environments and demonstrates a strong resistance to chloride stress-corrosion cracking. In this study, a multi-objective parametric optimization technique is used to model and optimize the process inputs and the response parameters during wire electrical discharge machining (WEDM) of Incoloy 800H. Statistical techniques, response surface methodology (RSM) and analysis of variance (ANOVA) were employed for this purpose. The correlation coefficient is used to determine the accuracy of statistical model predictions based on experimental data. The results of statistical analysis demonstrate that the model predictions and experimental observations are in high agreement, with correlation coefficients of 0.9224 for surface roughness and 0.9968 for material removal rate (MRR). Thus, RSM helps in choosing the best input parameters, minimizing experimental trials, and enhancing process efficiency. © Published under licence by IOP Publishing Ltd.

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Solid solution dependence of the deformation behavior in Mg-xZn(x=0,1,2 wt%)alloys:In-situ neutron diffraction and crystal plasticity modeling

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Journal of Magnesium and Alloys 2025年第2期13卷 823-838页

作者： Huai Wang Soo Yeol Lee You Sub Kim Huamiao Wang Wanchuck Woo Ke An School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China Department of Materials Science and Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Neutron Science Division Korea Atomic Energy Research InstituteDaejeon 34057Republic of Korea Neutron Scattering Division Oak Ridge National LaboratoryOak Ridge 37831United States

The effects of solid solution on the deformation behavior of binary Mg-xZn(x=0,1,2 wt%)alloys featuring a designated texture that enables extension twinning under tension parallel to the basal pole in most grains,were investigated using in-situ neutron diffraction and the EVPSC-TDT *** diffraction was used to quantitatively track grain-level lattice strains and diffraction intensity changes(related to mechanical twinning)in differently oriented grains of each alloy during cyclic tensile/compressive *** measurements were accurately captured by the *** stress-strain curves of Mg-1 wt%Zn and Mg-2 wt%Zn alloys show as-expected solid solution strengthening from the addition of Zn compared to pure *** macroscopic yielding and hardening behaviors are explained by alternating slip and twinning modes as calculated by the *** solid solution's influence on individual deformation modes,including basal〈a〉slip,prismatic〈a〉slip,and extension twinning,was then quantitatively assessed in terms of activity,yielding behavior,and hardening response by combining neutron diffraction results with crystal plasticity *** Mg-1 wt%Zn alloy displays distinct yielding and hardening behavior due to solid solution softening of prismatic〈a〉***,the dependence of extension twinning,in terms of the twinning volume fraction,on Zn content exhibits opposite trends under tensile and compressive loadings.

关键词： Magnesium alloy Deformation behavior Solid solution Crystal plasticity modeling Neutron diffraction

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