检索结果-南通市图书馆

Hardness-thermal stability synergy in nanograined Ni and Ni alloys:Superposition of nanotwin and low-energy columnar boundary

引用

Journal of Materials Science & Technology 2023年第6期137卷 123-131页

作者： F.H.Duan y.lin Q.Li J.H.Luan J.Lu J.Pan y.Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Laboratory of Nanomaterials&Nanomechanics Department of Mechanical EngineeringCity University of Hong KongHong KongChina State Key Laboratory of Material Processing and Die&Mould Technology and School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering City University of Hong KongHong KongChina Centre for Advanced Structural Materials Greater Bay Joint DivisionShenyang National Laboratory for Materials ScienceCity University of Hong Kong Shenzhen Research InstituteShenzhen 518057China City U-Shenzhen Futian Research Institute Shenzhen 518045China

Refining grains into nanoscale can significantly strengthen and harden metallic materials;however,nanograined metals generally exhibit low thermal stability,hindering their practical applications.In this work,we exploit the superposition of the contribution of nanotwins,low-angle grain boundaries,and microalloying to tailor superior combinations of high hardness and good thermal stability in Ni and Ni alloys.For the nanotwinned Ni having a twin thickness of∼2.9 nm and grain size of 28 nm,it exhibits a hardness over 8.0 GPa and an onset coarsening temperature of 623 K,both of which are well above those of nanograined Ni.Re/Mo microalloying can further improve the onset coarsening temperature to 773 K without comprising hardness.Our analyses reveal that high hardness is achieved via strengthen-ing offered by extremely fine nanotwins.Meanwhile,the superior thermal stability is mainly ascribed to the low driving force for grain growth induced by the low-angle columnar boundary architecture and to the additional pinning effect on the migration of twin/columnar boundaries provided by minor Re/Mo solutes.The present work not only reveals a family of nanotwinned metals possessing the combination of ultra-high hardness and high thermal stability but also provides a strategy for tailoring properties of metallic materials by pairing low-angle grain boundaries and twin boundaries.

关键词： Nanotwin Thermal stability Hardness Low-angle grain boundary Microalloying

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Unexpected creep behavior in a rejuvenated metallic glass

引用

Journal of Materials Science & Technology 2023年第32期163卷 140-149页

作者： J.P.Wu y.lin F.H.Duan Q.Chen H.T.Wang N.Li J.L.Wen J.Pan L.Liu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Material Processing and Die&Mould Technology and School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Laboratory of Nanomaterials&Nanomechanics Department of Mechanical EngineeringCity University of Hong KongHong KongChina Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China Shenzhen Polytechnic Shenzhen 518055China

Rejuvenation,bringing metallic glasses(MGs)to the younger and higher energy states,provides an alternative avenue to explore the interplay between the property and microstructures of MGs.In this study,the creep behavior of the Zr_(69.5)Cu_(12)Ni_(11)Al_(7.5)MGs was experimentally examined by controlling the energy state in terms of structural rejuvenation and thermal annealing.It is found that compared to the as-cast counterpart,the annealed MG at a lower energy state exhibits a higher hardness,a smaller displacement,and a lower creep rate due to the decreased free volume and the inhibited activation of the shear transformation zone.Conversely,the rejuvenated MG at a high energy state displays lower hardness and increased free volume content,yet it demonstrates superior creep resistance compared to its as-cast counterpart,which deviates from conventional understanding.This unexpected phenomenon occurs as the initial high-content free volume annihilates during creep,and strain hardening takes precedence over strain softening as the prevailing process during creep deformation,leading to a superior creep performance in extremely rejuvenated MGs.

关键词： Metallic glass Energy state Rejuvenation Creep Strain-hardening

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Bilinear Immersed Finite Volume Element Method for the Diffusion Equation with Discontinuous Coefficient

引用

Communications in Computational Physics 2009年第6期6卷 185-202页

作者： X.-M.He T.lin y.lin Department of Mathematics Virginia TechBlacksburgVA 24060USA Department of Mathematical and Statistical Science University of AlbertaEdmonton ABT6G 2G1Canada Department of Applied Mathematics The Hong Kong Polytechnic UniversityKowloonHong Kong

This paper is to present a finite volume element(FVE)method based on the bilinear immersed finite element(IFE)for solving the boundary value problems of the diffusion equation with a discontinuous coefficient(interface problem).This method possesses the usual FVE method’s local conservation property and can use a structured mesh or even the Cartesian mesh to solve a boundary value problem whose coefficient has discontinuity along piecewise smooth nontrivial curves.Numerical examples are provided to demonstrate features of this method.In particular,this method can produce a numerical solution to an interface problem with the usual O(h2)(in L2 norm)and O(h)(in H1 norm)convergence rates.

关键词： Interface problems immersed interface finite volume element discontinuous coeffi-cient diffusion equation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

VI-RADS多参数MRI对输尿管口膀胱肿瘤的评价

引用

国际医学放射学杂志 2022年第6期45卷 729-730页

作者： Q.Cai J.ling L.Kong y.Huang y.lin Z.Wen 周璐

摘要基于多参数 MRI 的膀胱成像报告和数据系统（VI－RADS）能够对术前膀胱癌分期标准化，但有局限性，特别是对于输尿管口的肿瘤。目的探讨 VI-RADS 在评估输尿

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Generation of kinetic Alfven waves by beam-plasma interaction in non-uniform plasma

Generation of kinetic Alfven waves by beam-plasma interactio...

引用

中国科学院地质与地球物理研究所2012年度（第12届）...

作者： M.H.Hong y.lin X.y.Wang Institute of Geology and Geophysics CAS Physics Department Auburn UniversityAuburnAlabama 36849-5311USA Department of Geophysics and Planetary Science USTC

This work reports a novel mechanism of the generation of kinetic Alfven waves(KAWs) using a two-dimensional hybrid simulation:the KAWs are generated by ion beam-plasma interaction in a non-uniform plasma boundary layer,in which the bulk velocity of the ion beam is assumed to be parallel to the ambient magnetic field.As a result of the beam-plasma interaction,strong shear

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

双极主观等级量表的级别选取

引用

机械设计与研究 2009年第4期25卷 70-72页

作者：乔柱杨国盛 Amol Ghorpade y. lin 章文俊华东理工大学机械与动力工程学院上海中央民族大学信息工程学院北京 Advanced Engineering Design Laboratory Department of Mechanical Engineering University of Saskatchewan57 Campus Dr. Saskatoon SK S7N 5A9 Canada Department of Mechanical and Industrial Engineering Northeastern University USA

双极等级工具(Bipolar rating instruments)用来测量人们对产品的情感观点。这种方法的常用和典型代表就是分为5,7和9这三种等级级别的等级量表(RatingScales),其中的数字代表了等级级别的数目(例如,‘5’表示总共有5种等级级别)。然而... 详细信息

双极等级工具(Bipolar rating instruments)用来测量人们对产品的情感观点。这种方法的常用和典型代表就是分为5,7和9这三种等级级别的等级量表(RatingScales),其中的数字代表了等级级别的数目(例如,‘5’表示总共有5种等级级别)。然而到目前很少有文献关注等级量表的最佳的级别数目问题。这里对这一问题进行了初步研究,尤其是针对这样的三种等级量表(S5,S7,S9),通过实验来给出了答案;研究表明,由于其高可靠性S最为适合。

关键词：主观等级量表评价双极一致性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

黄爱龙教授:“新型冠状病毒感染诱导机体特异性体液免疫反应的新认识”

引用

重庆医科大学学报 2021年第12期46卷 F0002-F0002页

作者： y.lin Z.y.Zhao J.X.Zheng 不详

由严重急性呼吸综合征冠状病毒2(SARS-CoV-2)引起的2019年新型冠状病毒肺炎(COVID-19)疫情目前仍在全球大范围流行,这使全球公共卫生健康面临持续挑战。根据世界卫生组织最新实时统计数据:截至2021年3月28日,全球累计新冠肺炎确诊病例1... 详细信息

由严重急性呼吸综合征冠状病毒2(SARS-CoV-2)引起的2019年新型冠状病毒肺炎(COVID-19)疫情目前仍在全球大范围流行,这使全球公共卫生健康面临持续挑战。根据世界卫生组织最新实时统计数据:截至2021年3月28日,全球累计新冠肺炎确诊病例1.26亿例,累计死亡病例276.97万例。新冠肺炎疫情已对人类的健康和预期寿命等产生了巨大影响,严重损害了全球的叉流合作和稳定发展。新冠病毒感染人体后,可诱导机体产生病毒特异性的体液免疫反应,通过效应B细胞等产生大量的病毒抗原特异性抗体IgA、IgM和IgG等(含中和抗体)来控制病毒的增殖、扩散和再感染。

关键词：体液免疫反应特异性体液免疫中和抗体病毒特异性病毒感染抗原特异性抗体严重急性呼吸综合征冠状病毒全球公共卫生

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

HIGH EPITAXIAL FERROELECTRIC RELAXOR Mn-DOPED Ba(Zr,Ti)O_(3) THIN FILMS ON MgO SUBSTRATES

引用

Journal of Advanced Dielectrics 2011年第4期1卷 383-387页

作者： M.LIU J.LIU G.COLlinS C.R.MA C.L.CHEN A.D.ALEMAyEHU G.SUBRAMANyAM C.DAI y.lin J.HE J.C.JIANG E.I.MELETIS A.BHALLA Q.y.ZHANG Department of Physics and Astronomy University of Texas at San Antonio San Antonio TX 78249USA Key Lab of Materials Modification by Laser Ion Electron BeamsDalian University of Technology Dalian 116024P.R.China The Texas Center for Superconductivity University of Houston HoustonTX 77204USA Department of Electrical and Computer Engineering University of Dayton DaytonOhio 45469USA State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu Sichuan 610054P.R.China Department of Material Science and Engineering University of Texas at Arlington Arlington TX 76019USA Department of Electrical and Computer Engineering University of Texas at San Antonio San Antonio TX 78249USA

Environment friendly ferroelectric relaxor Ba(Zr_(0.2)Ti_(0.8))O_(3)thin fims with the addition of 2%Mn dopant were grown on(001)MgO substrates by pulsed laser deposition.Microstructure studies with X-ray di®raction and transmission electron microscopy reveal that the as-grown Ba(Zr_(0.2)Ti_(0.8))O_(3) thin films are c-axis oriented with an atomic sharp interface.The films have good single crystallinity and good epitaxial quality.The interface relationship was determined to be[100]Mn.BZT//[100]MgO and(001)Mn.BZT//(001)MgO.Nanoscale order/disorder relaxor structures were found with nano-columnar structures.The microwave dielectric measurements(15-18GHz)indicate that the¯lms have excellent dielectric properties with large dielectric constant value,high tunability,and low dielectric loss,promising the development of room temperature tunable microwave elements.

关键词： Ferroelectric relaxor thin films Ba(Zr_(0.2)Ti_(0.8))O_(3) dielectric microwave

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

新型内镜切伦科夫发光成像系统检测和量化胃肠道疾病的可行性研究:人类首次结果

引用

国际医学放射学杂志 2015年第4期 407-408页

作者： H.Hu X.Cao F.Kang M.Wang y.lin M.Liu 乔辉 State Key Laboratory of Cancer Biology Department of Digestive Diseases Xijing Hospital Fourth Military Medical University

摘要目的切伦科夫发光成像(CLI)提供了应用临床放射性示踪剂进行光学成像可能性。本研究的目的是展示一个新开发的内镜CLI(ECLI)系统并阐明其识别和量化胃肠道

关键词：胃肠道疾病发光成像切伦科夫内镜

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Very high-K KREEP-rich clasts in the impact melt breccia of the lunar meteorite SaU 169:New constraints on the last residue of the Lunar Masma Ocean

Very high-K KREEP-rich clasts in the impact melt breccia of ...

引用

中国科学院地质与地球物理研究所2012年度（第12届）...

作者： y.lin W.Shen y.Liu L.Xu B.A.Hofmann Q.Mao G.Q.Tang F.Wu X.H.Li Key Laboratory of the Earth's Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences National Astronomical Observatories Chinese Academy of Sciences

In the impact melt breccia(IMB) of Sayh al Uhaymir(SaU) 169,the most KREEP-rich lunar meteorite to date(Gnos et al.,2004),clasts of a new type of lithologies were discovered,consisting of Ca-poor and Ca-rich pyroxenes(60.8 vol.%), Ba-rich K-feldspar(27.9 vol.%),phosphates(5.6 vol.%),Nb-rich ilmenite(4.0 vol.%),zircon(1.2 vol.%) and minor sulfide (0.6 vol.%).These mafic lithic clasts are more enriched in KREEP component(～1500×CI) than the host meteorite and are highly enriched in potassium.They are referred to as very high-K(VHK) KREEP lithology,and probably most close to the last residual liquid of the Lunar Magma Ocean without significant dilution by other Mg-rich magmas.The fine-grained matrix of the SaU 169 IMB has very similar mineral chemistry to the VHK KREEP lithology,but contains abundant plagioclase with trace K-feldspar.The matrix shows decoupling of K from the REEP-like component;however,it cannot be simply interpreted by mixing the VHK KREEP lithology with anorthosites,which should have diluted the REEP-like component with the same proportion. STMS Pb-Pb dating was conducted on zircons in various petrographic settings and with different crystal habits.All analyses show a main age peak at 3921±3 Ma and a smaller one at 4016±6 Ma.The main age peak is identical to the previous Pb-Pb age by Gnos et al.(2006) and U-Pb age by Liu el al.(2009),dating the catastrophic shock event contributed to the formation of SaU 169 IMB.The older ages are consistent with the previous report of an older bulk U-Pb age by Kramers et al.(2007),suggestive of presence of relict crystals in a few large zircon grains.The VHK KREEP clasts predated the finegrained matrix,but have the same zircon Pb-Pb ages as the latter within the analytical uncertainties.Plagioclase was converted to maskelynite whereas zircon was shocked to diaplectic glass,probably by a second event at～2.8 Ga.However, the identical zircon Pb-Pb ages of the amorphous parts and the remained crystalline areas indicate no resetting of Pb-Pb isotopes by the later shock

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：