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Influence of tool pin profile on the interface migration of friction stir lap joints＊

China Welding 2011年第4期20卷 6-11页

作者：邢丽邹贵生柯黎明魏鹏 School of Aeronautical Manufacturing Engineering Nanchang Hangkong University Nanchang330063. Key Laboratory for Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084.

Friction stir lap joints of LY12 aluminum alloy plates with a thickness of 3 mm were fabricated using several tools with different pin profiles. The effects of tool pin profile on the interface migration of friction stir lap joints were investigated with the comparison of weld morphologies. The results show that the screw thread of the pin plays an important role in the migration of weld interface in the thickness direction. The interface between the sheets will move upwards to the top of the plate when the pin with left hand thread was used. Conversely, the interface will move downwards to the tip of the pin when the pin with right hand thread was used： As for a stir pin with smooth surface was used, the upward or downward migration of the weld interface was largely reduced, but the extension of weld interface to the weld center line from the retreating side becomes more serious. By analyzing the force on the pin according to the sucking-extruding theory for the weld formation, the obtained results have been well explained.

关键词： friction stir welding lap joint pin profile interface migration

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Computational Investigation of Blade slotting on a High-Load Low-Pressure Turbine Profile at various Reynolds Numbers:Part Ⅰ——Slotting Scheme's Verification

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Journal of Thermal Science 2011年第1期20卷 13-20页

作者： Qiang Du Junqiang Zhu Min Zhou Wei Li Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 Graduate School of Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Advanced Energy and Power Chinese Academy of Sciences （Institute of Engineering Thermophysics） Beijing 100080 China Beijing Aeronautical Technology Research Center Beijing 100076 ER. China

Boundary layer separation and reattachment is often an unavoidable feature of low pressure (LP) turbine,one of the main causes of this phenomenon is the high altitude low Reynolds number experienced by the modern LP turbine stage in *** an excellent turbine airfoil design can avoid flow separation on certain extent,but within flight envelope,LP turbine's characteristic Reynolds number may varied greatly,so it will be still under the risk of the presence of separation *** this two parts paper a new concept of slotted-blade was raised to testify the gain of the blade slotting.A high aerodynamic loading LP turbine blade IET-LPTA was under investigated with different Reynolds *** results reveal that the blade slotting could be a way of choice to suppress separation bubble and reduce profile loss under the condition of low Reynolds number,although its position and geometry need to be further investigated.

关键词： Boundary layer separation and reattachment High aerodynamic loading LP turbine blade Slotted-blade

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Corrosion protection and formation mechanism of anodic coating on SiC p/Al metal matrix composite

Corrosion protection and formation mechanism of anodic coati...

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作者： He, Chunlin Lou, Deyuan Wang, Jianming Cai, Qingkui Institute of Surface Engineering Shenyang University Shenyang 110044 China Liaoning Key Laboratory of Advanced Materials Preparation Technology Shenyang University Shenyang 110044 China

The corrosion protection from sulfuric acid anodized coatings on 2024 aluminum and SiC particle reinforced 2024 aluminum metal matrix composite (SiCp/2024Al MMC) in 3.5 wt.% NaCl aqueous solution was investigated using electrochemical methods. The results show that the anodized coating on 2024Al provides good corrosion protection to 3.5 wt.% NaCl, and the anodized coating on the SiCp/2024Al MMC provides some corrosion protection, but it is not as effective as for 2024Al because non-uniformity in thickness and cavities present are associated with the SiC particulates. Cavities above SiC particles are the reason that the anodized coating on the MMC cannot be completely sealed by hot water as with anodic Al alloy. SiC particle anodizes at a significantly reduced rate compared with the adjacent Al matrix. This gives rise to alumina film encroachment beneath the particle and occlusion of the partly anodized particle in the coating. It was found that the barrier layer of anodized Al MMC is not continuous, and it is composed primarily of the barrier layer of anodized Al matrix and a barrier-type SiO2 film on occluded SiC particles in the coating. A new formation mechanism of coating growth during anodizing of a SiCp/2024Al MMC was proposed. © 2011 Elsevier B.V. All rights reserved.

关键词： Corrosion resistance

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Corrosion Resistance of TiN Imitation Gold Decoration Coatings on Golden-Pen Components

Corrosion Resistance of TiN Imitation Gold Decoration Coatin...

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The 8th Asian-European International Conference on Plasma surface engineering 第八届亚欧国际等离子体表面工程会(AEPSE2011)

作者： Jun ying Hou Di Yang Qingdao University of Science and Technology Shandong Provincial Key Laboratory of Polymer Material Advanced Manufactorings TechnologySurface Engineering LaboratoryQingdao 266061China

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Bulk metallic glass Ti42Cu37.1Co4Zr 8Sn2Ag2Be4.9 with high glass forming ability and ductility

Bulk metallic glass Ti42Cu37.1Co4Zr 8Sn2Ag2Be4.9 with high g...

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2011 1st International Conference on High Performance Structures and Materials engineering, ICHPSM 2011

作者： Zhang, Xin Fang Li, Hongxiang Jiang, Zhiqiang Yi, Seonghoon School of Mechatronics Engineering Zhengzhou Institute of Aeronautical Industry Management Zhengzhou 450015 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China Department of Materials Sciences and Metallurgy Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 Korea Republic of

Bulk metallic glass Ti42Cu37.1Co4Zr 8Sn2Ag2Be4.9 that can be cast into a fully amorphous rod of more than 6 mm in diameter by copper molder casting has been developed through systematic alloy design. The bulk metallic... 详细信息

ISBN: (纸本)9783037850756

关键词： Glass

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Bulk metallic glass Ti42Cu37.1Co4Zr8Sn2Ag2Be4.9 with high glass forming ability and ductility

Bulk metallic glass Ti42Cu37.1Co4Zr8Sn2Ag2Be4.9 with high gl...

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2011 First International Conference on High Performance Structures and Materials engineering (ICHPSM 2011)

作者： Xinfang Zhang Hongxiang Li Zhiqiang Jiang Seonghoon Yi School of Mechatronics Engineering Zhengzhou Institute of Aeronautical Industry Management State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Department of Materials Sciences and Metallurgy Kyungpook National University

Bulk metallic glass TiCuCoZrSnAgBe that can be cast into a fully amorphous rod of more than 6 mm in diameter by copper molder casting has been developed through systematic alloy *** bulk metallic glass exhibits high f... 详细信息

关键词： Bulk metallic glass Copper molder casting Kissinger equation Crystallization Shear band

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Nearly total absorption of light and heat generation by plasmonic metamaterials

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Physical Review B 2011年第16期83卷 165107-165107页

作者： Jiaming Hao Lei Zhou Min Qiu Laboratory of Photonics and Microwave Engineering School of Information and Communication Technology Royal Institute of Technology (KTH) Electrum 229 Kista S-164 40 Sweden State Key Laboratory of Surface Physics and Physics Department Fudan University Shanghai 200433 China State Key Laboratory of Modern Optical Instrumentation and Institute of Advanced Nanophotonics Department of Optical Engineering Zhejiang University Hangzhou 310027 China

We theoretically and numerically study the absorption effect and the heat generation in plasmonic metamaterials under light radiation at their plasmonic resonance. Three different types of structures, all possessing high-performance absorption for visible lights, are investigated. The main aim of this work is to present an intuitive and original understanding of the high-performance absorption effects. From the macroscopic electromagnetic point of view, the effective-medium approach is used to describe the absorption effects of the plasmonic metamaterials. On the other hand, the field distributions and heat generation effects in such plasmonic nanostructures are investigated, which also provides a satisfactory qualitative description of such absorption behavior based upon the microscopic perspective.

关键词： LIGHT absorption PLASMONS (Physics) METAMATERIALS ELECTROMAGNETISM ELECTROMAGNETIC fields PLASMA electrodynamics

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Study of γ/γ′ interfaces in nickel-based, single-crystal superalloys by scanning transmission electron microscopy

Study of γ/γ′ interfaces in nickel-based, single-crystal ...

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作者： Ge, Binghui Luo, Yushi Li, Jiarong Zhu, Jing Beijing National Center for Electron Microscopy Tsinghua University Beijing 100084 China Institute of Physics Chinese Academy of Sciences Beijing 100190 China National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials Beijing Institute of Aeronautical Materials Beijing 100095 China Department of Materials Science and Engineering Beijing National Center for Electron Microscopy Tsinghua University Beijing China

The interfaces of γ/γ′ in crept Re-bearing, single-crystal, nickel-based superalloys have been studied by scanning transmission electron microscopy. Elements Ni and Ta are congregated at the γ′ side, ahead of the Re enrichment near interfaces, which shows the retarding effect on element diffusion during creep by Re enrichment. A growth step exists at the γ/γ′ interfaces with the apex of kinks congregated with heavy atoms, which may slow down interface displacement during creep. © 2010 The Minerals, Metals & Materials Society and ASM International.

关键词： Creep

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Computational Investigation of Blade slotting on a High-Load Low-Pressure Turbine Profile at various Reynolds Numbers：Part ISlotting Schemes Verification

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Journal of Thermal Science 2011年第1期20卷 21-25页

作者： Du Qiang Zhu Junqiang Zhou Min Li Wei Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China Graduate School of Chinese Academy of Sciences Beijing China Key Laboratory of Advanced Energy and Power Chinese Academy of Sciences （Institute of Engineering Thermophysics） Beijing China Beijing Aeronautical Technology Research Center Beijing China

The concept of using blade slotting to suppress the large boundary layer separation of high aerodynamic loading low pressure turbine profile has been developed in Part 1. Calculated results highlight the inability performance accompanied with un-proper blade slotting at high Reynolds number, blade slotting optimization seems like compulsory. Meanwhile, to further dignify the rational for use of blade slotting, slotting position and its geometry needed to be optimized. Comparison of different slotting scheme calculation results promised that blade slotting parameter like outlet angle and outlet position are the most important parameters which must be investigated to satisfy the design purpose.

关键词： Blade slotting Optimization Outlet angle Inlet position

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Preparation of micro-patterned surfaces of Si-N-O films and their influence on adhesion behavior of endothelial cells

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Science China(Technological Sciences) 2010年第1期53卷 257-263页

作者： ZHENG Nan,YANG Ping,WANG QiYi,YANG ZhongHai & HUANG Nan key laboratory of advanced technology for Materials of Education Ministry,key laboratory of Artificial Organ surface engineering of Sichuan,School of Materials Science and engineering,Southwest Jiaotong University,Chengdu 610031,China 1. Key Laboratory of Advanced Technology for Materials of Education Ministry Key Laboratory of Artificial Organ Surface Engineering of Sichuan School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China

Microgrooves were prepared on Si(100) surface by photolithography and wet ***,Si-N-O films were deposited on the microgrooves by unbalanced magnetron sputtering(UBMS) and micro-patterned surfaces of Si-N-O films were *** size of the micropatterns was measured by surface *** chemical composition of Si-N-O films were characterized by X-ray photoelectron spectrometry(XPS) and the wettability of the micropatterned surfaces was evaluated by contact angle *** behavior of endothelial cells adhered on the micro-patterned surfaces,including cells adhesion,proliferation and orientation,was evaluated by cell culture test and Alamar blue *** results showed that the amount and activity of endothelial cells on micro-patterned samples were higher than those on flat *** one day's incubation,the cells were well guided along the *** days later,most of the cells grew across the grooves and contacted each *** activity was also much higher than that on flat *** was suggested that the adhesion and proliferation of endothelial cells could be effectively enhanced by micropattern method.

关键词： micropatterns Si-N-O film endothelial cell unbalanced magnetron sputtering

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