Daqian SUN
,
Zhenfeng ZHOU and Haicheng CAO (Dept. of Mater. Sci. Eng.
,
Jilin University of Technology
,
Changchun 130022
,
China)
材料科学技术（英文）
Effect of Si, Al and Bi on the microstructure and mechanical properties of as-welded and austempered ductile iron weld metals has been studied with SEM, TEM, X-ray diffraction, image analysing system, tension and other test methods. Results show that increasing weld Si, Al and Bi content favours improving the chilling tendency of as-welded ductile iron weld and mechanical properties of austempered ductile iron weld and the mechanism is also discussed. On this basis the optimum chemical composition of weld is determined. The mechanical properties of weld and welded joint after austempering can match those of austempered ductile iron
关键词:
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
By cyclically deforming a [(5) over bar 913]perpendicular to[(5) over bar 79] copper bicrystal with a perpendicular grain boundary (GB), the fatigue crack initiation and fracture behavior were investigated. It was found that only the primary slip systems were activated on both G1[(5) over bar 913] and G2[(5) over bar 79] grains including the vicinity of the GB at axial plastic strain range of 1.8 x 10(-4)-2.56 x 10(-3). By observing the surface and fractography, it was confirmed that the fatigue cracks always nucleated and propagated along the GB, and displayed an obvious tendency on different surfaces. On the front surface of the bicrystal, the intergranular cracking was more preferential than that on the lateral surface, even though the geometrical conditions among PSB, GB and stress axis on the lateral surface claimed to enhance cracking are more close to those proposed by Christ (Mater. Sci. Eng. A117 (1989) L25). Based on the experimental results above, the effect of the interaction of PSB with GB and stress axis on intergranular fatigue cracking in the bicrystal is discussed. It is suggested that Christ's geometrical conditions for intergranular cracking might be further developed and the plastic strain incompatibility near the GB should play a more important effect on intergranular fatigue cracking. (C) 1999 Elsevier Science S.A. All rights reserved.
关键词:
copper bicrystal;cyclic deformation;grain boundary;fractography;intergranular cracking;nucleation
Journal of Materials Research
The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.
关键词:
room-temperature
Composites Science and Technology
Short glass fiber-reinforced nylon 6,6 with and without rubbery inclusions were injection molded into standard specimens. The mechanical properties and the residual fiber length distribution were measured. The macro-to-micro model proposed by Bowyer and Bader [J. Mater. Sci., 7 (1972) 1315] was used to determine the interfacial shear strength (IFSS). The IFSS in the toughened nylon 6,6-based composites was found to be superior to that in the untoughened nylon 6,6-based composites. This indicates that the presence of rubbery phase in the composite system contributed to the interfacial bonding between nylon 6,6 and glass fibers (GF). Back-scattered electron imaging taken on a plane perpendicular to the mold filling direction for fiber-reinforced toughened nylon 6,6 showed that the rubbery phase adhered to the GF surface. This morphological feature was regarded as a main factor responsible for the improvement of IFSS in the reinforced toughened nylon 6,6 composites. (C) 2004 Published by Elsevier Ltd.
关键词:
glass fiber;nylon 6,6;reinforced polymers;glass;strength;behavior;microstructures;thermoplastics
杨金瑞
,
余尚先
,
顾江楠
高分子材料科学与工程
通过对resol(羟甲基酚化合物和低分子量羟甲基酚树脂)DEPT135图谱的分析讨论,得到一系列计算resol微细结构参数的经验公式.根据DEPT135图谱可判断是否发生缩聚反应,根据经验公式可计算酚单体各个活性点参与反应百分率或酚羟基导入率、不同类型缩聚所占百分率及低分子量羟甲基酚树脂的平均核体数.
关键词:
羟甲基酚化合物
,
羟甲基酚树脂
,
DEPT135
,
结构参数
中国腐蚀与防护学报
由中国金属学会主办、中国科学院金属研究所承办的英文期刊ActaMetallurgicaSinica（EnglishLettersl于近日通过ThomsonReuters的评审，入选SCI数据库。该刊自2009年起出版的论文被ThomsonReuters旗下的ScienceCitationIndexExpanded（alsoknownasSeiSeareh），JournalCitationReports／ScienceEdition和CurrentContents@／EngineeringComputingandTechnol-ogy所收录。这是继（《金属学报》和《材料科学技术（英文版）》之后，金属所承办的又一被SCI收录的期刊。
关键词:
SCI
,
中国科学院金属研究所
,
中国金属学会
,
英文期刊
,
材料科学技术
,
数据库
中国腐蚀与防护学报
由中国金属学会主办、中国科学院金属研究所承办的英文期刊ActaMetallurgicaSinica（EnglishLettersl于近日通过ThomsonReuters的评审，入选SCI数据库。该刊自2009年起出版的论文被ThomsonReuters旗下的ScienceCitationIndexExpanded（alsoknownasSeiSeareh），JournalCitationReports／ScienceEdition和CurrentContents@／EngineeringComputingandTechnol-ogy所收录。这是继（《金属学报》和《材料科学技术（英文版）》之后，金属所承办的又一被SCI收录的期刊。
关键词:
SCI
,
中国科学院金属研究所
,
中国金属学会
,
英文期刊
,
材料科学技术
,
数据库
Physica E-Low-Dimensional Systems & Nanostructures
Generally, phase transfer of metal nanoparticles between aqueous phase and organic phase need two reagents at last. One is stabilizer of nanoparticles, the other is phase-transfer agent (Chem. Lett. 21 (1992) 1527; J. Colloid Interface Sci. 161 (1993) 471; J. Phys. Chem B 101 (1997) 9876; Chem. Commun. (1997) 537; Langmuir 14 (1998) 602; J. Phys. Chem B 103 (1999) 7238; Chem. Mater. 13 (2001) 4692; Langmuir 17 (2001) 733; Langmuir 16 (2000) 9775; Langmuir 18 (2002) 3364; J. Am. Chem. Soc. 123 (12001) 11148). In this paper, Ag nanoparticle prepared by tannic acid reduction of AgNO3 in aqueous medium were transferred to chloroform solution via a remarkably simple one-step route under the effect of phase-transfer inducer dimethyldioctadecylammonium chloride (DDAC), where no special stabilizer was required. Monolayer of Ag nanoparticles is obtained on carbon film by self-assembly using chloroform organosol. The effect of the inducer DDAC concentration is checked, and it was found that 5 x 10(-3) mol dm(-3) of DDAC was the optimum concentration for phase transfer of Ag nanoparticles. The organosol, Ag nanoparticle self-assembled monolayer and phase transfer were characterized by UV-vis spectra, TEM, ED and TF-IR. (C) 2004 Elsevier B.V. All rights reserved.
关键词:
silver;nanostructures;UV-Vis spectroscopy;DDAC;organosol;modified gold nanoparticles;shape-controlled synthesis;silver;nanoparticles;colloidal gold;aspect-ratio;nanorods;toluene;nanodisks;platinum;water
腐蚀学报（英文）
由中国金属学会主办、中国科学院金属研究所承办的英文期刊Acta Metallurgica Sinica（English Letters）于近日通过Thomson Reuters的评审，入选SCI数据库．该刊自2009年起出版的论文被Thomson Reuters旗下的Science Citation Index Expanded（alsoknownas Sci Search），Journal Citation Reports／science Edition和Current Contents/Engineering Computingand Technology所收录．这是继《金属学报》和《材料科学技术（英文版）》之后，金属所承办的又一被SCI收录的期刊
关键词:
SCI
,
中国科学院金属研究所
,
Thomson
,
中国金属学会
,
Edition
,
英文期刊
,
材料科学技术
,
数据库
Journal of Physics and Chemistry of Solids
The layered ternary ceramics Ti3SiC2 and Ti3AlC2 are isostructural and can form Ti3Si1-xAlxC2 solid solutions combining the advanced properties of both compounds [H.B. Zhang, Y.C. Zhou, Y.W. Bao, M.S. Li, Improving the oxidation resistance of Ti3SiC2 by forming a Ti3Si0.90Al0.1C2 solid solution, Acta Mater. 52 (2004) 3631-3637; E.D. Wu, J.Y. Wang, H.B. Zhang, Y.C. Zhou, K. Sun, Y.J. Xue, Neutron diffraction studies of Ti3Si0.9Al0.1C2 compound, Mater. Lett. 59 (2005) 2715-2719; J.Y. Wang, Y.C. Zhou, First-principles study of equilibrium properties and electronic structure of Ti3Si0.75Al0.25C2 solid solution, J. Phys.: Condens. Matter 15 (2003) 5959-5968; Y.C. Zhou, J.X. Chen, J.Y. Wang, Strengthening of Ti3AlC2 by incorporation of Si to form Ti3Al1-xSixC2 solid solutions, Acta. Mater. 54 (2006) 1317-1322]. In the present work, the solid solutions of Ti3Si1-xAlxC2 (x = 0, 0.25, 0.33, 0.5, 0.67, 0.75, 1) are investigated by first-principle calculations based on pseudo-potential plan-wave method within the density functional theory framework. The results show that as Al content increases in the solid solution, all the bonds have weakened to certain extents, which lead to an unstable structure both energetically and geometrically. The calculated results are compared and discussed with the reported data for the Ti3Si1-xAlxC2 solid solutions. (c) 2007 Elsevier Ltd. All rights reserved.
关键词:
ceramics;ab initio calculations;electronic structure;electrical;conductivity;oxidation behavior;mechanical-properties;ti3sic2;temperature;ti3alc2;air;si
