检索结果-南通市图书馆

Low Shear Strength and Shear-Induced Failure in Ti3.iC2

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2003年第3期19卷 197-200页

作者： Yiwang BAO Yanchun ZHOUHigh Performance Ceramic Division, shenyang National Laboratory for materials Science, Institute of Metal Research, {2. Academy of {3., shenyang 110016, china Lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Shear strength and shear-induced Hertzian contact damage in Ti_3.iC_2.were investigated using double-notched-beam specimen and steel spherical indenter, respectively. The shear strength of 40 MPa that was only about 10% of bending strength was obtained for this novel ceramic. The SEM fractograph of specimens failed in shear test indicated a combination of intergranular and transgranular fracture. Under a contact load, plastic indent without cone crack could be formed on the surface of Ti3.iC2.sample. Optical observation on side view showed half-circle cracks around the damage zone below the indent, and the crack shape was consistent with the contrail of the principal shearing stress. The low shear strength and the shearing-activated intergranular sliding were confirmed being the key factors for failure in Ti3.iC2.

关键词： Ti_3.iC_2 Shear strength Contact damage Double-notched specimen

Chronological record of the Early Mesozoic underplating in the northern margin of North china—U-Pb chronometry of zircons in the Late Mesozoic andesite from Western Liaoning

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:materials international 2007年第8期17卷 943-947页

作者： Shao ji'an~(1,2.*) Zhang Hongfu~2.Liu Xiaoming~3.Li Zhitong~4 (1.School of Earth and Space sciences,Peking University,Beijing 100871,{3. 2.Institute of Geology and Geo{2. and Key Laboratory of Mineral Resources,chinese Academy of sciences,Beijing 10002.,{3. 3.Key Laboratory of Continental Dynamics,Northwestern University,Xi'an 710069,{3. 4.Institute of Geology and Mineral Resources of shenyang,shenyang 11003.0}{3.) School of Earth and Space sciences Peking University Beijing 100871 China Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Acad. of Sci. Beijing 100029 China Key Laboratory of Continental Dynamics Northwestern University Xi'an 710069 China Institute of Geology and Mineral Resources of shenyang Shenyang 110032 China

Cathodoluminescence spectroscopic analysis of zircons in the uppermost sanukites of the early Cretaceous Yixian Forma- tion in Western Liaoning reveals zoning structures of the zircons in the volcanic rocks. LA-ICP-MS chronometry shows that the central part of the zircons is remnant zircon with a U-Pb dating of 2.4 Ma,which is consistent with the age of the Early Mesozoic underplating granulites,and that the periphery is zircon crystallizing out of the host magma with a U-Pb dating of 116 Ma,which is highly consistent with the Ar-Ar dating of the host volcanic *** of the clinopyroxenes xenocrystals in the sanukites are similar to those of the clinopyroxenes in the underplating granulites,indicating that the granulites accreted to the lower crust in the Early Mesozoic have been reformed and disrupted by the upwelling diapers of the asthenosphere and taken part in formation of the sanukites in the Late Mesozoic.

关键词： northern margin of North china Mesozoic volcanic rock U-Pb chronometry of zircon underplating granulite

Optical, Mechanical and Laser-induced Damage Threshold Properties of 1064 nm, 53.0}nm Frequency-doubled Antireflection Coating for LBO

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(materials Science) 2011年第4期26卷 687-689页

作者：谭天亚 Department of physics Liaoning University

1 064 nm, 53.0}nm frequency-doubled antireflection （AR） coatings with buffer layer of SiO2.between the coating and the substrate were fabricated by the electron beam evaporation technology on the substrate of lithium triborate （LiB3.5 or LBO） crystals. The residual reflectance of the sample is 0.07% and 0.11% at 1 064 nm and 53.0}nm, respectively. The adhesion and the laser-induced damage threshold （LIDT） of the sample are greater than 2.0 mN and 18.6 J/cm2. The strengthening mechanism of adhesion and LIDT of the buffer layer of SiO2.were discussed by considering full plastic indentation and shear theory, and spallation of a plated film induced by thermal shock stress, respectively.

关键词： frequency-doubled AR coating LBO adhesion LIDT buffer layer

Nanocrystallization of Cementite in 0.4C-1Cr Steel During High-Power Surface Processing

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(materials Science) 2005年第3期20卷 60-63页

作者：赵新奇 School of materials Science and Engineering Tongji University Shanghai Baosteel Research Institute Shanghai 201900China

The microstructures of the nanocrystalline surface layer of a quenched and high temperature tempered 0. 4C- 1Cr steel induced by high-power surface processing （HPSP） technique were characterized by scan- ning eleetron microscopy and transmission electron microscopy. The results indicate that a nanocrystalline layer was fabricated on the surface of the steel 19 using HPSP treatment. The mean grain size in the surface layer is about 11 nm. The nanocrystallization of cementite is prior to that of the matrix phase, ferrite.

关键词： cementite high-power surface processing surface nanocrystallization

Microstructural Characteristics of La_(0.7)Ca_(0.3.MnO_3.Films and Multilayers

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2000年第6期16卷 601-604页

作者： Mingguang WANG, DouXing LI, Lianlong HE and Hengqiang YE (Laboratory of Atomic Imaging of Solid, Institute of Metal Research, chinese Academy of sciences,{2.,{3.) Guangcheng XIONG (Department of physics and Mesoscopic physics National Labo Lab. of Atomic Imaging of Solid Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110015 China

La0.7Ca0.3.nO3.(LCMO) films and La0.7Ca0.3.nO3.Gd0.7Ca0.3.nO3.(LCMO/GCMO) multilayers have been prepared by pulsed laser deposition. The microstructures of both systems were investigated by transmission electron microscopy (TEM). The main structure of the films and the multilayers was monoclinic with a unit cell of size 2.p x-2.p. x -2.p, where ap is the lattice constant of single perovskite crystal. The LCMO films were composed of three-dimension multitwinning domains, while the LCMO/GCMO multilayers showed two-domain structure. In LCMO/GCMO multilayers, LCMO layers were coherent with GCMO layers and the interfaces between LCMO and GCMO layers were free from mismatch dislocation, which resulted in highly strained multilayerd structures.

关键词： LCMO Microstructural Characteristics of La MnO3.Films and Multilayers Ca

Simulation of Tensile Behavior of Nickel Foam

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S3期40卷 224-227页

作者： Zhao Mingjuan 1, Zhang Xiaolan 1, Zhao Longzhi 1,3. Zhang Jinsong 2.1 Key Laboratory of Ministry of Education for Conveyance and Equipment, East china Jiaotong University, Nanchang 3.0013. china 2.Institute of Metal Research, {2. Academy of sciences, shenyang 110016, china 3.Key Laboratory of Superlight materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, china E china Jiaotong Univ Key Lab Minist Educ Conveyance & Equipment Nanchang 330013 Peoples R China Harbin Engn Univ Minist Educ Key Lab Supertight Mat & Surface Technol Harbin 150001 Peoples R China chinese Acad Sci Inst Met Res Shenyang 110016 Peoples R China

Nickel foam is widely used as the electrode, the catalyst carrier, sound absorption material and other application fields. The tensile behavior of the open cell nickel foam which is one of the most important parameters in the design process was investigated with the finite element method based on ANSYS software in this paper. The effects of strain rates and temperature on the yield strength of the nickel foam were obtained. The results show that the yield strength exhibit a nonlinear reduction with the increases of the temperature for the elastic bending of the struts of the reinforcement grew quickly depending on the temperature. However, the yield strength increases slowly with the improvement of the strain rate because the strain rate neither change the internal structure and properties such as the porosity and the aperture, nor alter the external circumstance in order to change the internal properties such as the temperature. The results of the simulation accord with those of the experiments, which is very important to understand the tensile behavior of the foam materials.

关键词： nickel foam ANSYS yield strength temperature strain rate

Effect of Respective Additions of Ga, Zr and Combined Additions of Co, Ga, Zr on Magnetic Properties of Remanence-enhanced Nd_(8.4) Fe_(87.1) B_(4.5) Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2000年第2期16卷 118-120页

作者： Baozhi CUI, Xiaokai SUN, Wei LIU, Zhidong ZHANG, Dianyu GENG and Xinguo ZHAO (Institute of Metal Research, chinese Academy of sciences,{2.,{3.) Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The effect of a partial substitution of Zr, Ga; Co and Ga; Co. Ga and Zr; respectively, for Fe on the structure and magnetic properties of Nd_8.4Fe_87.1B_4.5 alloy prepared by mechanical alloying has been studied in detail. It has been shown that, intrinsic coercivity μ0 H_c and maximum magnetic energy product (BH)_max increase for only Zr or Ga-containing samples, which is mainly due to the refinement of soft grains. The combined addition of Co and Ga is less effective for improving μoH_c and (BH)_max than the respective addition of Co or Ga. which may be due to the formation of CsCl-type CoGa. μoH_c and (BH)_max for combined Co, Ga. Zr-added alloy are higher than those for the combined Co, Ga-added alloy but lower than those for only Zr-containing alloy.

关键词： Alloy Fe Zr on Magnetic Properties of Remanence-enhanced Nd Effect of Respective Additions of Ga Nd

Growth and Microstructure of r.f. Sputtered Fe/Ti Multilayers

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2001年第5期17卷 521-524页

作者： Wei WANG shenyang National Laboratory for materials Science, Institute of Metal Research, {2. Academy of {3., shenyang 110016, china Lishi WEN Department of Surface Engineering of materials, Institute of Metal Research, {2. Academy of Science shenyang Natl. Lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Fe/Ti multilayers with different modulation wavelengths (Lambda) prepared by r.f. sputtering has been investigated by using cross sectional transmission electron microscopy (XTEM). It was observed that the columnar structure, interface morphology, and metastable phase presented at the interface of the multilayer system strongly depend on the bilayer thickness (Lambda). For high period multilayers, the waviness wavelength of interfaces is about two times broader than the column diameter. For a sample with Lambda =3. nm, its column width and waviness wavelength was about 80, and 190 nm, respectively. Both of them decreased with the reduction of Lambda, so as to nearly equal values of column diameter and waviness wavelength were obtained. The Fe and Ti grains of both 3. nm and 6 nm multilayers are polycrystalline, and have a textured structure. In short bilayer thickness (Lambda =6 nm), the intermetallic compound Fe2.i was presented at the interfaces due to solid state reaction; for Lambda =2.nm, amorphous phase Ti-rich layer was formed at the interfaces, resulting in a sharp interface multilayer structure.

关键词： Ti Growth and Microstructure of r.f Sputtered Fe/Ti Multilayers Fe

Properties of Reactive Magnetron Sputtered ITO Films without in-situ Substrate Heating and Post-deposition Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2000年第3期16卷 281-285页

作者： Meng CHEN, Xuedong BAI, Jun GONG, Chao SUN, Rongfang HUANG and Lishi WEN (Institute of Metal Research, the chinese Academy of sciences,{2.,{3.) Ion Beam Lab. Shanghai Institute of Metallurgy Chinese Academy of Sciences Shanghai 200050 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Indium tin oxide (ITO) films were prepared on polyester, Si and glass substrate with relatively high deposition rate of above 0.9 nm/s by DC reactive magnetron sputtering technique at the sputtering pressure of 0.06 Pa system, respectively. The dependence of resistivity on deposition parameters, such as deposition rate, target-to-substrate distance (TSD), oxygen flow rate and sputtering time (thickness), has been investigated, together with the structural and the optical properties. It was revealed that all ITO films exhibited lattice expansion. The resistivity of ITO thin films shows significant substrate effect: much lower resistivity and broader process window have been reproducibly achieved for the deposition of ITO films onto polyester rather than those prepared on both Si and glass substrates. The films with resistivity of as low as 4.2. x 10^-4 Ω.cm and average transmittance of ～78% at wavelength of 400～700 nm have been achieved for the films on polyester at room temperature.

关键词： ITO Properties of Reactive Magnetron Sputtered ITO Films without in-situ Substrate Heating and Post-deposition Annealing TSD rate than