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Influence of Ru addition on microstructure and stress-rupture property of Ni-based single crystal superalloys

Progress in Natural science:materials International 2010年第1期20卷 61-69页

作者： Jing-yang CHEN~1,Qiang FENG~(1,2),La-mei CAO~3,Zu-qing SUN~1 1.State key laboratory for advanced Metals and materials,university of science and Technology beijing, beijing 100083,china 2.National Center for materials Service Safety,university of science and Technology beijing,beijing 100083,china 3.National key laboratory of science and Technology on advanced High Temperature Structural materials, beijing Institute of Aeronautical materials,beijing 100095,china Univ Sci & Technol beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China Univ Sci & Technol beijing Natl Ctr Mat Serv Safety Beijing 100083 Peoples R China beijing Inst Aeronaut Mat Natl Key Lab Sci & Technol Adv High Temp Struct M Beijing 100095 Peoples R China

The effects of Ru on the microstructure and stress-rupture property were investigated in two experimental Ni-based single crystal superalloys with and without Ru addition(5.1%,mass fraction).The results indicate that the morphology ofγ' precipitates in the dendrite core and interdendritic region are intermediate and nearly spherical,respectively,in the Ru-free alloy after being aged at 1100℃for 8 *** Re partitioning ratio increases due to Ru addition and Ru partitioned preferentially to theγphase in both dendrite core and interdendritic region of the Ru-containing alloy,which results in more negative lattice misfit and more cuboidalγ' ***,theγ' volume fraction increases while the precipitate size and y channel width decreases due to Ru addition in both dendrite core and interdendritic *** addition improves the stress-rupture life at 1100℃/140 MPa significantly due to higherγ' volume fraction,more negative lattice misfit and a well rafting structure as well as lessγchannel width.

关键词： Ni-based superalloys ruthenium elemental partitioning ratio lattice misfit γ’ morphology stress-rupture property

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A Study on the Wear Resistance of Nano-Material/E51

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Journal of materials science & Technology 2004年第3期20卷 340-343页

作者： Yan GAO Zhenjia WANG Quanyu MA Ge TANG Ji LIANG State key laboratory of Tribology, department of Mechanical engineering, tsinghua university, beijing 100084, china Lab. of Tribology Dept. of Mech. Eng. Tsinghua Univ. Beijing 100084 China

Epoxy resin modified by nanometric γ-alumina or multi-walled carbon nanotubes (MCNTs) was prepared with solution mixingmethod, and the wear resistance of the composite was studied. The results show that when an optimum amount of nanometricalumina or MCNTs is filled in epikote51 (E51), the wear resistance of the composite will increase. When 8 wt pct nanometricγ-alumina is filled in E51, the wear resistance of the composite increases to 230%. When 10% MCNTs is filled in E51, thewear resistance of the composite increases to 226%. When nanometric alumina is filled in, the wear resistance of modifiedepikote51 will increase as the cure temperature is heightened.

关键词： Epoxy resin Nanometric γ-alumina Multi-walled carbon nanotubes (MCNTs) Wear resistance

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Acid/alkali gated photochromism of two diarylperfluorocyclopentenes

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science china Chemistry 2007年第5期50卷 581-586页

作者： CHEN ZiHui1, ZHAO ShengMin2, LI ZhongYu1, ZHANG Zhi1 & ZHANG FuShi1 1 The key Lab of Organic Optoelectronics & Molecular engineering of ministry of education, department of Chemistry, tsinghua university, beijing 100084, china 2 Lab of Printing & Packing materials and Technology-beijing Area Major laboratory, beijing Institute of Graphic Communication, beijing 100084, china 1. The key Lab of Organic Optoelectronics & Molecular engineering of ministry of education Department of Chemistry Tsinghua University Beijing 100084 China 2. Lab of Printing & Packing materials and Technology-beijing Area Major laboratory Beijing Institute of Graphic Communication Beijing 100084 China

Two novel diarylfuorocyclopentenes, which underwent gated photochromism, were synthesized. It was found that the photochromic property of these diarylethenes could be switched by alternative addition of acids/alkalis,... 详细信息

关键词： photochromism, diarylethene, gated reactivity, pyridinium betaine

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Interface-directed sol-gel:direct fabrication of the covalently attached ultraflat inorganic oxide pattern on functionalized plastics

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science china Chemistry 2010年第1期53卷 173-182,287-288页

作者： GAN ShengHua,YANG Peng & YANG WanTai State key laboratory of Chemical Resource engineering College of materials science and engineering,beijing university of Chemical Technology,beijing 100029,china 1. State key laboratory of Chemical Resource engineering College of materials science and engineering Beijing University of Chemical Technology Beijing 100029 China

For plastic electronics and optics,the fabrication of smooth,transparent and stable crack-free inorganic oxide films(and patterning) on flexible polymeric substrates with strong bonding strength and controllable thickness from nanometers to micrometers is a key but still remains a *** versatile inorganic oxides,silica oxide film as SiOx is especially important because this semiconductor material could provide crucial properties in devices or serve as a base layer for further multilayer *** this paper,we describe a new interface-directed sol-gel method to fabricate flexible high quality silicon oxide film onto commodity *** resulting crack-free silica film has strong covalent bonding with polymer substrates,homogeneous morphology with ultralow roughness,highly optical transparency,tunable thickness from nm to μm,and easy patterning *** fabrication strategy relies on a novel photocatalytic oxidation reaction by photosensitive ammonium persulfate(APS),which is able to fabricate highly reactive hydroxyl monolayer surface on inert polymeric *** kind of hydroxylated surface could serve as nucleation and growth sites to initiate surface sol-gel *** a result,well-defined SiOx film deposition(gelation) occurs,and patterned hydroxylation regions could be easily utilized to induce the formation of patterned oxide film *** strategy also excludes the requirements of clean room and vacuum devices so as to fulfill low-cost and fast fabrication *** application examples from such high quality SiOx layer onto plastics are given but should not be limited within *** is that oxygen permeation rate of SiOx deposited polymer film decreases 25 times than pristine polymer substrate,which is good for the potential packaging *** other one is that silanization monolayer,for example,3-aminopropyltriethoxysilane(APTES),could be successfully constructed onto silica layer through classical silanization reac

关键词： surface patterning silicon oxide sol-gel polymer surface modification functional coatings

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A novel synthetic route for LiFePO_4/C cathode materials by addition of starch for lithium-ion batteries

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Chinese Chemical Letters 2007年第2期18卷 237-240页

作者： Shao Hua Luo, Zi Long Tang, Jun Biao Lu, Zhong Tai Zhang State key laboratory of New Ceramics and Fine Processing, department of materials science and engineering, tsinghua university, beijing 100084, china Graduate School at Shenzhen, tsinghua university, Shenzhen 518055, china [a]State key laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China [b]Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

LiFePO4/Carbon composite cathode material was prepared using starch as carbon source by spray-pelleting and subsequent pyrolysis in N2. The samples were characterized by XRD, SEM, Raman, and their electrochemical performance was investigated in terms of cycling behavior. There has a special micro-morphology via the process, which is favorable to electrochemical properties. The discharge capacity of the LiFePO4.C composite was 170 mAh g-1, equal to the theoretical specific capacity at 0.1 C rate. At 4 C current density, the specific capacity was about 80 mAh g-1, which can satisfy for transportation applications if having a more flat discharge flat.

关键词： Lithium-ion batteries Cathode material Carbon coated LiFePO4 Spray-pelleting

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Effect of Finish Rolling Temperature on Microstructure and Mechanical Properties of High Grade Pipeline Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 625-628页

作者： TANG Xing-chang,KANG Yong-lin,BO Yan-yan (School of materials science and engineering,State key laboratory for advanced Metals and materials,university of science and Technology beijing,beijing 100083,china) Univ Sci & Technol beijing State Key Lab Adv Met & Mat Sch Mat Sci & Engn Beijing 100083 Peoples R China

The correlation among finish rolling temperature (FRT),microstructure and mechanical property of the high grade pipeline steel was investigated in this *** microstructure of the steels with different finish rolling temperatures was observed with scanning electronic microscope (SEM) and transmission electronic microscope (TEM).The martensite/austenite (M/A) islands distribution was fixed by colour metallography,and the mechanical properties of the steels were tested with quasi-static tensile testing *** result shows that the fraction of M/A island increased with the finish rolling temperature decreasing,and when the finish rolling temperature is 800℃,the mechanical properties are the best.

关键词： high grade pipeline steel finish rolling temperature martensite/austenite island

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Microstructure and Properties of 980MPa UltrafineGrained Cold Rolled Dual-Phase Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 316-319页

作者： HAN Qi-hang,KANG Yong-lin,ZHAO Xian-meng (School of materials science and engineering,State key laboratory for advanced Metals and materials,university of science and Technology beijing,beijing 100083,china) Univ Sci & Technol beijing Sch Mat Sci & Engn State Key Lab Adv Met & Mat Beijing 100083 Peoples R China

Two kinds of 980MPa grade cold rolled dual phase steels have been developed by designing C-Si-Mn and C-Si-Mn-Nb alloy *** microstructure of martensite in Nb-free steel is consisted of lath martensite and twined martensite with the volume fraction of 67%.However,the main hard phase in Nb-containing one is twined martensit with the volume percent of 59%.The size of martensite islands in Nb-containing steel is from 1μm to 3μm,and the size of NbC precipitates is from 15nm to *** to Nb-containing steel,the yield strength,tensile strength,yield ratio and elongation are 501MPa,1035MPa,0.48 and 17.5% ***,Nb-containing steel has higher working hardening rate value above the critical strain 6.5%.And it decreases slowly with increasing the *** is mainly because of ultrafine grain size and nano-precipitates in ferrite,which improves the compatibility of phases and reduces the stress concentration at the phase interface.

关键词： ultra-high-strength dual-phase steel ultra-fine grain microstructure properties

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Microstructure refinement and magnetic properties enhancement of nanocrystalline Nd_(12.3)Fe_(81.7)B_(6.0) ribbons by addition of Zr

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science china(Technological sciences) 2009年第7期52卷 1891-1896页

作者： BAO XiaoQian, QIAO Yi, GAO XueXu, ZHU Jie & ZHOU ShouZeng State key laboratory for advanced Metals and materials, university of science and Technology beijing, beijing 100083, china 1. State key laboratory for advanced Metals and materials University of Science and Technology Beijing Beijing 100083 China

Effects of Zr addition and annealing treatment on the formation, microstructure and magnetic properties of Nd12.3Fe81.7?xZrxB6.0 (x=0―3.0) ribbons melt-spun and annealed have been systematically investigated by means of vibrating sample magnetometer (VSM), differential scanning calorimeter (DSC), X-ray diffraction (XRD), and high resolution scanning electron microscopy (HRSEM). Phase analysis reveals that Nd2Fe14B is single-phase material. It has been found that the intrinsic coercivity Hci of the optimally processed Nd12.3Fe81.7?xZrxB6.0 ribbons increases monotonically from 751.7 kA/m for x=0 to 1005.3 kA/m for x=3.0. The remanence polarization Jr and maximum energy product (BH)max increase first with Zr addition, then slightly decrease with further increasing Zr content. Optimum magnetic properties with Jr=1.041 T, Hci=887.5 kA/m and (BH)max=175.2 kJ/m3 have been achieved for the ribbons with x=1.5. The significant improvement of magnetic properties originates from the finer grains of the ribbons by introducing Zr.

关键词： Nd-Fe-B magnets nanocrystalline microstructure magnetic properties

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Hexafluoro-2-propanol as a potent cosolvent for chemical ligation of membrane proteins

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science china Chemistry 2011年第1期54卷 110-116页

作者： SHEN Fei,TANG Shan & LIU Lei department of Chemistry,university of science and Technology of china,Hefei 230026,china key laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology,ministry of education department of Chemistry,tsinghua university.beijing 100084,china 1. department of Chemistry University of Science and Technology of China Hefei 230026 China2. Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology Ministry of Education department of Chemistry Tsinghua University Beijing 100084 China

The study on membrane proteins is an important challenge mainly because of their very poor solubility in various *** traditional recombinant expression strategy and the native chemical ligation method both have difficulty in generating sufficient amounts of desired proteins with high *** studies have shown that multiply fluorinated alcohols exhibit good ability to dissolve difficult peptide sequences,especially hexafluoro-2-propanol (HFIP).In the present study we systematically studied the capability of solvents containing different percentage of HFIP in dissolving transmembrane *** both HPLC and UV analyses we concluded that 60% HFIP/8 M urea constituted a good solvent *** this solvent system we also optimized conditions to perform native chemical ligation (NCL).Under the optimized conditions we successfully achieved NCL’s for both dipeptide formation and the synthesis of a model protein (Trifolitoxin).These results suggested that HFIP was a potential cosolvent that could be used in the ligation of poorly soluble peptides for the generation of membrane proteins.

关键词： membrane protein native chemical ligation alternative solvent hexafluoro-2-propanol

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Performance of RAP in the System of Cold Inplace Recycling of Asphalt Pavement

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Journal of Wuhan university of Technology(materials science) 2011年第6期26卷 1211-1214页

作者：马保国 key laboratory for Silicate materials science and engineering of ministry of education Wuhan University of Technology

The property of reclaimed asphalt pavement（RAP） mixture will be affected mainly by composition of old asphalt/soil and cement content in CIR system. We studied the relationship between A/S and cementitious materials. It showed that if there was no soil in RAP, the unconfined compressive strength was only from 0.18 MPa to 1.07 MPa even if adding cement was from 2% to 6%, and RAP samples collapsed during conserving in water. The optimum water content rose from 6.5% to 11% with the declining of A/S from S=0 to A/S=1/5. Five RAP samples all got the maximum compressive strength when A/S=5/5, and the maximum compressive strength of the samples adding 6% cement was 3.17 MPa. It showed that the capacity of RAP was not only affected by A/S, but also by the content of cement. The dynamic modulus of RAP will increase with the rise of loading frequency and decrease with the temperature rising. SEM test showed that C-S-H interlacing formed the netted structure, and it enwrapped the aggregate and improved the strength of RAP.

关键词： cold in-place recycling(CIR) old asphalt reclaimed asphalt pavement (RAP) compressive strength dynamic modulus

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