检索结果-内蒙古大学图书馆

Strengthening and deformation mechanism of high-strength CrMnFeCoNi high entropy alloy prepared by powder metallurgy

引用

Journal of materials science & Technology 2023年第1期132卷 119-131页

作者： Y.Xing C.J.Li Y.K.Mu Y.D.Jia K.K.Song J.Tan G.Wang Z.Q.Zhang J.H.Yi J.Eckert Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 12Leoben A-8700Austria Adjunct with National University of Science and Technology«MISiS» Leninsky Prosp.4Moscow 119049Russia

Multiphase CrMnFeCoNi high-entropy alloys(HEAs)were prepared by a powder metallurgy process com-bining mechanical alloying(MA)and vacuum hot-pressing sintering(HPS).The single-phase face-centered cubic(FCC)HEA powder prepared by MA was sintered into a bulk HEA specimen containing FCC phase matrix along with precipitated M 23 C 6 phase and nanoscaleσphase *** the sintering temper-ature was 1223 K,the ultimate strength reaches 1300±11.6 MPa,and the elongation exceeds 4%±0.6%.Microstructural characterization reveals that the formation of nanoscale particles and deformation twins play critical roles in improving the strain hardening(SH)*** the MA time promoted the formation of the precipitated phase and enhanced the SH ability by increasing the number of precip-itated *** SH capacity increases significantly with increasing sintering temperature,which is attributed to a significant enhancement in the twinning capacity due to grain growth and the reduced number ofσphase *** systematic studies,the planar glide of dislocations was found to be the main mode of deformation,while deformation twinning appeared as an auxiliary deformation mode when the twinning stress was *** the formation of precipitates leads to grain bound-ary and precipitation strengthening effects,crack initiation is more prominent owing to increased grain boundary brittleness around the precipitated M 23 C 6 *** prominence of crack initiation is a contra-diction that must be reconciled with regard to precipitation *** work serves as a useful reference for the preparation of high-strength HEA parts by powder metallurgy.

关键词： High entropy alloy Powder processing Grain reﬁnement Precipitation strengthening Deformation twinning

来源：评论

学校读者我要写书评

暂无评论

Real-space atomic dynamics in metallic liquids investigated by inelastic neutron scattering

引用

Physical Review B 2024年第2期110卷 024309-024309页

作者： Zengquan Wang Wojciech Dmowski Hui Wang Robert Ashcraft Douglas L. Abernathy Kenneth F. Kelton Takeshi Egami Shull-Wollan Center Department of Materials Science and Engineering Department of Physics and Institute of Materials Science and Engineering Neutron Scattering Division Department of Physics and Astronomy Materials Sciences and Technology Division

Understanding the dynamics of liquids at the atomic level remains a major challenge. Even though viscosity is one of the most fundamental properties of liquids, its atomistic origin is not fully elucidated. Through inelastic neutron scattering experiment on levitated metallic liquid droplets, the time-dependent pair correlation function, the Van Hove function, was determined for Zr50Cu50 and Zr80Pt20 liquids at various temperatures. The time for change in local atomic connectivity, τLC, which is the timescale of atomic bond cutting and forming, is estimated based on the exponential decay of the nearest neighbor peak of the Van Hove function. At high temperatures above the crossover temperature TA, τLC is equal to the Maxwell relaxation time, τM=η/G∞, where η is the macroscopic shear viscosity and G∞ is the high-frequency shear modulus. Below TA the ratio of τM/τLC increases with decreasing temperature, indicating increased atomic cooperativity as predicted by molecular dynamics simulation.

关键词： Diffusion Structural properties Neutron pair-distribution function analysis Neutron scattering

来源：评论

学校读者我要写书评

暂无评论

Oriented structural design of MXene electrodes for lithium sulfur catalysis

引用

Journal of Energy Chemistry 2024年第12期99卷 66-73页

作者： Yu Wang Jiaming Li Qinhua Gu Zhilin Liu Hengrui Zhang Shunri Zheng Shichong Xu Kar Ban Tan Yaxiao Luo Zhaoliang Yu Haibo Li Wenjuan Han Mingzhe Zhang Ming Lu Bingsen Zhang State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012JilinChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education The Joint Laboratory of MXene Materialsjilin Normal UniversityChangchun 130103JilinChina Department of Chemistry.Faculty of Science University Putra MalaysiaSerdang 43400SelangorMalaysia School of Optoelectronic Science Changchun College of Electronic TechnologyChangchun 130114jilinChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai jiao Tong UniversityShanghai 200240China

The lithium-sulfur reaction can contribute to the chemical electrical energy conversion capacity due to the multi-level ion/electron transfer process. However, the appearance of soluble intermediate products prevents efficient electron transfer, making it impossible to achieve stable cycling and capacity contribution. Restricted catalysis provides a solution for inhibiting the shuttle of soluble lithium ***, MXene aerogel with optimized channel utilization is designed as S host according to the polysulfide control strategy of localization, adsorption, and catalysis. With the help of the results of oriented channels, the polysulfide conversion process is optimized, providing a comprehensive scheme for inhibiting the shuttle effect. Lithium sulfur catalytic batteries have achieved high capacity and stable *** system provides a comprehensive solution for lithium sulfur reaction catalysis and a new perspective for the functional application of MXene based lithium sulfur batteries.

关键词： MXene Aerogel Lithium-sulfur battery Catalyst

来源：评论

学校读者我要写书评

暂无评论

Understanding Degradation Mechanisms in Single Crystal NMC Cathodes for Enhanced Lithium-Ion Battery Performance - A Review 2

Understanding Degradation Mechanisms in Single Crystal NMC C...

引用

2nd International Conference on Multidisciplinary engineering and Applied science, ICMEAS 2023

作者： Abraham, Bernice Ngwi Ngasoh, Odette Fayen Offia-Kalu, Nkechi E. Anye, Vitalis Chioh Amune, Daniel Obi, Uchenna C. Bello, Abdulhakeem Department of Materials Science and Engineering Abuja Nigeria Department of Mechanical Engineering Abuja Nigeria African University of Science and Technology Department of Materials Science and Engineering Abuja Nigeria Department of Theoritical Applied Physics Abuja Nigeria

ISBN: (纸本)9798350358834

Lithium-ion batteries have revolutionized portable electronics and electric transportation, but their longevity and performance continue to be the focus of research. Single crystal nickel manganese cobalt (SC-NMC) cathodes are emerging materials for advancing lithium-ion battery technology. However, harnessing their potential requires comprehending the degradation mechanisms which occur during cycling. This review presents an extensive analysis of the intricate degradation processes affecting them. We explore the structural transformations, surface layer formation, and lithium loss mechanisms that govern the capacity fade and voltage decay observed in these cathode materials. By examining the latest developments in diagnostic techniques and characterization methods, we examine the tools available for studying degradation phenomena. Furthermore, mitigation strategies to enhance the resilience of NMC cathodes are explored, elucidating material modifications and protective coatings. Understanding this is pivotal for designing more robust lithium-ion batteries. This review identifies critical research gaps, offering a roadmap for advancements in energy storage. © 2023 IEEE.

关键词： Single crystals

来源：评论

学校读者我要写书评

暂无评论

Boron Nitride-Integrated Lithium Batteries:Exploring Innovations in Longevity and Performance

引用

Energy & Environmental materials 2024年第6期7卷 13-40页

作者： Shayan Angizi Sayed Ali Ahmad Alem Mahdi Torabian Maryam Khalaj Dmitri Golberg Amir Pakdel Department of Chemical Engineering McMaster University1280 Main St WHamiltonONL8S 4L7 Canada Institute of Chemistry of Polymeric Materials Montanuniversität LeobenOtto-Glöckel-Strasse 2A-8700 LeobenAustria Department of Chemistry Materials and Chemical EngineeringPolitecnico di MilanoPiazza Leonardo da Vinci 3220133 MilanItaly Department of Materials Science and Engineering Northwestern UniversityEvanstonIL60208 USA Centre for Materials Science and School of Chemistry and Physics Queensland University of Technology(QUT)2 GeorgeBrisbaneQLD4000 Australia Research Centre for Materials Nanoarchitectonics(MANA) National Institute for Materials Science(NIMS)Namiki 1Ibaraki3050044 Japan Department of Mechanical Manufacturing and Biomedical EngineeringTrinity College DublinThe University of DublinDublinD02PN40 Ireland

The current global warming,coupled with the growing demand for energy in our daily lives,necessitates the development of more efficient and reliable energy storage *** batteries(LBs)are at the forefront of emerging power sources addressing these *** studies have shown that integrating hexagonal boron nitride(h-BN)nanomaterials into LBs enhances the safety,longevity,and electrochemical performance of all LB components,including electrodes,electrolytes,and separators,thereby suggesting their potential value in advancing eco-friendly energy *** review provides an overview of the most recent applications of h-BN nanomaterials in *** begins with an informative introduction to h-BN nanomaterials and their relevant properties in the context of LB ***,it addresses the challenges posed by h-BN and discusses existing strategies to overcome these limitations,offering valuable insights into the potential of BN *** review then proceeds to outline the functions of h-BN in LB components,emphasizing the molecular-level mechanisms responsible for performance ***,the review concludes by presenting the current challenges and prospects of integrating h-BN nanomaterials into battery research.

关键词： electrode electrolyte hexagonal boron nitride lithium battery separator

来源：评论

学校读者我要写书评

暂无评论

Tuning the magnetic anisotropy in artificially layered Mn3GaN/Mn3Ga superlattices

引用

Physical Review materials 2024年第1期8卷 L011401-L011401页

作者： Lu Guo Neil Campbell Alexander J. Grutter Gahee Noh Tianxiang Nan P. Quarterman Si-Young Choi Thomas Tybell Mark S. Rzchowski Chang-Beom Eom Department of Materials Science and Engineering University of Wisconsin-Madison Madison Wisconsin 53706 USA Department of Physics University of Wisconsin-Madison Madison Wisconsin 53706 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Department of Materials Science and Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea Center for Van der Waals Quantum Solids Institute for Basic Science Pohang 37673 Republic of Korea Department of Electronic Systems Norwegian University of Science and Technology Trondheim 7491 Norway

Artificially layered superlattices with two distinct spin structures offer new opportunities for manipulation of magnetic properties and interfacial spin configurations. We have grown epitaxial, coherent superlattices of ferrimagnetic Mn3Ga and noncollinear antiferromagnetic Mn3GaN. The out-of-plane ferrimagnetism of the Mn3Ga layer, and the Berry-phase charge to spin current generation by the noncollinear antiferromagnetic Mn3GaN layer, provide a unique combination for spintronic applications. Reactive magnetron sputtering growth resulted in abrupt transitions between the two layers through controlling the N2 flow. X-ray diffraction and cross-sectional scanning transmission electron microscopy images demonstrate clean layering and consistent modulation wavelengths, with interfacial roughness less than one unit cell. This allows investigation of the interfacial magnetic interactions. Through a combination of superconducting quantum interference device magnetometry and polarized neutron reflectometry we show that Mn3Ga/Mn3GaN superlattice structures have the out-of-plane magnetic anisotropy decreased compared to Mn3Ga single-layer films. This softening is primarily a result of reduced anisotropy energy at the interface and is linked to the Mn3GaN layer. This superlattice structure provides a platform for devices that use out-of-plane spin torques generated from an antiferromagnetic material to switch the net magnetic moment of a ferrimagnetic material. Our results demonstrate the tunability of magnetic anisotropy to allow for optimal balancing of the switching power and thermal stability in spintronic heterostructures.

关键词： Magnetic anisotropy Magnetism

来源：评论

学校读者我要写书评

暂无评论

In situ silver clusters decorated Bi_(24)O_(31)Cl_(10)nanorods for boosting photo-thermal catalytic activities

引用

Journal of materials science & Technology 2024年第23期190卷 236-247页

作者： Yunxiang Zhang Yu Wang Chenliang Zhou Hazem Abdelsalam Wei Chen Li Huang Zhichao Mu Zhili Chen Diab Khalafallah Qinfang Zhang School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Key Laboratory for Ecological-Environment Materials of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China Theoretical Physics Department National Research CentreEl-Buhouth Str.12622DokkiGizaEgypt Mechanical Design and Materials Department Faculty of Energy EngineeringAswan UniversityP.O.Box 81521AswanEgypt

High photogenerated carrier recombination rate and weak spectral response are the two main factors restricting photocatalytic activities of *** this work,a novel Ag/Bi_(24)O_(31)Cl_(10)heterojunction has been developed by the in-situ photoreduction technique to address the preceding ***-chemical properties of as-synthesized 0.7 wt%Ag/Bi_(24)O_(31)Cl_(10)photocatalysts were investigated in *** Ag clusters can be seen as surface plasmon polaritons to light absorption capacity and photothermal effect,which was demonstrated via Raman and UV-Vis diffuse reflectance spectra(UV-Vis DRS).Den-sity functional theory(DFT)calculations show that the additional unoccupied crystal orbital by the silver(Ag)will accelerate the charge separation where some of the excited electrons to the conduction band of Bi_(24)O_(31)Cl_(10)will drift to these orbitals which in turn prevent charge ***,Ag metal cluster-decorated Bi_(24)O_(31)Cl_(10)photocatalysts can be identified as electron trappers to boost the spatial separation of the photogenerated carrier,and finally,the CH 4 generation rate and the rhodamine b(RhB)degraded efficiency of Ag/Bi_(24)O_(31)Cl_(10)photocatalysts are enhanced about 1.54 and 5.20 times,*** Ag/Bi_(24)O_(31)Cl_(10)composite photocatalyst retained high photocatalytic activities after four cycles indi-cating the stability and repeatability of the Ag/Bi_(24)O_(31)Cl_(10)*** work aims to provide new insight into modifying ideal semiconductor materials for high photocatalytic activity.

关键词： Photocatalyst Bi_(24)O_(31)Cl_(10) Ag clusters Surface plasmon polariton Electron trapper

来源：评论

学校读者我要写书评

暂无评论

Insights into ionic association boosting water oxidation activity and dynamic stability

引用

Journal of Energy Chemistry 2024年第2期89卷 99-109,I0004页

作者： Zanling Huang Shuqi Zhu Yuan Duan Chaoran Pi Xuming Zhang Abebe Reda Woldu Jing-Xin Jian Paul K.Chu Qing-Xiao Tong Liangsheng Hu Xiangdong Yao Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province Shantou UniversityShantou 515063GuangdongChina Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515063GuangdongChina State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology Wuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina School of Advanced Energy Sun Yat-sen University(Shenzhen)Shenzhen 518107GuangdongChina

There have been reports about Fe ions boosting oxygen evolution reaction(OER)activity of Ni-based catalysts in alkaline conditions,while the origin and reason for the enhancement remains ***,we attempt to identify the activity improvement and discover that Ni sites act as a host to attract Fe(Ⅲ)to form Fe(Ni)(Ⅲ)binary centres,which serve as the dynamic sites to promote OER activity and stability by cyclical formation of intermediates(Fe(Ⅲ)→Fe(Ni)(Ⅲ)→Fe(Ni)-OH→Fe(Ni)-O→Fe(Ni)OOH→Fe(Ⅲ))at the electrode/electrolyte interface to emit O_(2).Additionally,some ions(Co(Ⅱ),Ni(Ⅱ),and Cr(Ⅲ))can also be the active sites to catalyze the OER process on a variety of *** Fe(Ⅲ)-catalyzed overall water-splitting electrolyzer comprising bare Ni foam as the anode and Pt/Ni-Mo as the cathode demonstrates robust stability for 1600 h at 1000 mA cm^(-2)@~1.75 *** results provide insights into the ioncatalyzed effects boosting OER performance.

关键词： Oxygen evolution reaction Fe(Ⅲ)-catalysis Ni-Fe binary active centers Ion-catalyzed effects Robust stability

来源：评论

学校读者我要写书评

暂无评论

Magnetic microstructure of nanocrystalline Fe-Nb-B alloys as seen by small-angle neutron and x-ray scattering

引用

Physical Review B 2024年第5期110卷 054437页

作者： Venus Rai Ivan Titov Michael P. Adams Kiyonori Suzuki Joachim Kohlbrecher Andreas Michels Department of Physics and Materials Science Department of Materials Science and Engineering CH-5232 Villigen PSI Switzerland

We have investigated the magnetic microstructure of two-phase Fe-Nb-B based Nanoperm alloys using unpolarized small-angle neutron scattering (SANS) and small-angle x-ray scattering (SAXS). Our SANS analysis reveals a significantly large magnetic scattering contribution due to spin misalignment, primarily originating from the substantial jump in the longitudinal magnetization at the interfaces between the particles and the matrix. The magnetic scattering exhibits an angular anisotropy that resembles a clover-leaf-type pattern, consistent with the predictions of micromagnetic SANS theory. Analysis of the one-dimensional SANS data yields values for the exchange-stiffness constant and the average anisotropy and magnetostatic fields. The micromagnetic correlation lengths for all three samples exhibit a similar field variation with sizes ranging between about 10–35nm. We also find that the nuclear and magnetic residual scattering component of the SANS cross section exhibits a similar q dependency as the SAXS data. These findings further validate the applicability of the micromagnetic SANS theory, and the mesoscopic information obtained is important for the advancement of the soft magnetic properties of this class of material.

关键词： Magnetic anisotropy Magnetic interactions Micromagnetism Magnetic nanoparticles Nanoparticles Magnetism Magnetization measurements Micromagnetic modeling Neutron scattering Neutron techniques Small angle neutron scattering Small-angle x-ray scattering X-ray scattering

来源：评论

学校读者我要写书评

暂无评论

Recovery of a Luther-Emery phase in the three-band Hubbard ladder with longer-range hopping

引用

Physical Review B 2024年第1期110卷 014511-014511页

作者： Luhang Yang Thomas P. Devereaux Hong-Chen Jiang Stanford Institute for Materials and Energy Sciences Department of Physics Department of Materials Science and Engineering

A lightly doped single-band Hubbard model on a two-leg ladder exhibits a Luther-Emery phase, whereas the three-band Hubbard ladder behaves as a Luttinger liquid upon hole doping. To understand this discrepancy, we present a systematic density-matrix renormalization group study of the three-band Hubbard model on two-leg cylinders with further-neighbor particle hoppings. The inclusion of the longer-range hopping is motivated by the studies of the single-band Hubbard model in which the further-neighbor hopping terms are suggested to be crucial for the unconventional superconductivity. When the longer-range hopping parameters are small, the ground state is a Luttinger liquid having mutually commensurate superconducting, charge, and spin density wave correlations. Increasing the longer-range hopping drives a transition into a Luther-Emery phase with quasi-long-ranged superconducting and charge orders but short-ranged spin-spin correlations. By down-folding the three-band Hubbard model into an effective t−t′−J−J′ model, we find that in the Luther-Emery phase, both the nearest- and second-neighbor kinetic energies are enhanced due to an effective increase of copper-oxygen hybridization. Amplifying intercell oxygen orbital hopping mirrors the benefits of reducing the charge transfer energy, causing doped holes to favor oxygen orbitals and strengthening superconducting pairing.

关键词： Multiband superconductivity Superconducting phase transition Cuprates Hubbard model Numerical techniques

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：