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Densification and Microstructure of β-sialon/Nano-size SiC Composites

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Journal of materials Science & Technology 1997年第4期13卷 339-341页

作者： Cheng ZHANG Danyu JIANG Qiang LI and Weiying SUN (Shanghai Institute of Ceramics, chinese academy of sciences, Shanghai 200050, china) Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

β-sialon/nano-size SiC composite ceramic with DyAG(Dy3Al5O12) as grain boundary phase was fabricated through hot-pressing. The effect of nano-size SiC on densification, phase composition, microstructure and mechanica... 详细信息

关键词： Nano SiC Densification and Microstructure of sialon/Nano-size SiC Composites

Pressure-induced crystallite breaking in La_(0.7)Sr_(0.3)Mn_(0.9)Fe_(0.1)O_3 nanosolids

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chinese Science Bulletin 1998年第6期43卷 458-461页

作者： ZHENG Fanlei 1, 2, SUI Yu 1, 3, XU Dapeng 1 and SU Wenhui 1, 4 1. Department of physics, Jilin University, Changchun 130023, china 2. Changchun Institute of physics, chinese academy of sciences, Changchun 130021, china 3. Institute of Metal R Department of physics Jilin University Changchun Chinas Changchun Institute of physics Chinese Academy of Sciences Changchun China Institute of Metal Research Chinese Academy of Sciences Shenyang China international Center for materials physics Chinese Academy of Sceinces Shenyang China Center for Condensed Matter and Radiation physics CCAST (World Lab.) Beijing China

In the compacting process of the La 0.7Sr 0.3Mn 0.9Fe 0.1O 3 nanosolids under the pressure range of 0.0-4.5 GPa, the apparent pressure-induced crystallite breaking phenomenon in these nanosolids was observed. With increasing pressure up to 4.5 GPa, the average grain size decreases by 46% while the magnetization of nanosolids decrease by 40% and their coercive increases by 35%. This kind of breaking has a close relation to the existence of oxygen deficiency in La 0.7Sr 0.3Mn 0.9Fe 0.1O 3 nanoparticles. A simple and convenient method for preparing the bulk nanosolids with a large number of clean interfaces has been suggested.

关键词： nanosolid pressure-induced breaking high pressure.

Tape Casting of Al_2O_3-TiB_2/Al_2O_3-Nano-TiC Multilayer Composites

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Journal of materials Science & Technology 1997年第4期13卷 324-326页

作者： Yuping ZENG Dongliang JIANG Shouhong TAN and Jingkun GUO(Shanghai Institute of Ceramics, chinese academy of sciences, Shanghai 200050, china) Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

Ceramic tapes, containing Al2O3-25 wt pct TiB2(B) and Al2O3-25 wt pct nano-TiC (c), have been obtained by tape casting process. Numerous tapes (about 60～80 tapes) were prepared by stacking in turn the composition (B) and (C), laminating under 10 MPa pressure, eliminating the solvent and burning out the polymer additives. The final green bodies were hot pressed at 1750℃ and 30 MPa. The composite has a bending strength of 568 MPa and a fracture toughness of 5.8 M Pa·m1/2. SEM analysis exhibits that Al2O3 particle growth was inhibited by TiC particles in C. but TiB2 particles could not hinder Al2O3 growth in B. The curves of GTA indicates that all organic additives could be removed completely above 600℃

关键词： Nano TiB Al Tape Casting of Al2O3-TiB2/Al2O3-Nano-TiC Multilayer Composites TiC

Transmission spectra characteristics of 1D photonic crystals with complex dielectric constant

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Rare Metals 2011年第2期30卷 150-154页

作者： GAO Yingjun CHEN Haibo QIU Hongguang LU Qianghua HUANG Changgao College of Physical Science and Engineering Guangxi University Nanning 5300041 China Center oflnternational materials and physics Chinese Academy of Science Shenyang 110016 China

The characteristics of photonic forbidden bands, transmission gain and absorption of one-dimensional （ID） dual-periodical photonic crystals （PC） with a complex dielectric layer were studied by using the optical transfer matrix （TM） method. The results show that the photonic band gap （PBG） of this structure is enlarged and many transmission resonance peaks appear in PBG. Large transmission gain for transmission peaks is obtained if the imaginary part of dielectric constant is negative. With the increase of the absolute value of the imaginary part, the transmission gain increases firstly and the transmittance gain gets to an apex. The imaginary parts of dielectric constant corresponding to transmission gain apex are different according to wavelength. However, the transmission ratio of resonance peaks is less than 1 if the imagi- nary part of dielectric constant is positive. The properties might be used to design multi-narrow-channel band filters and optical amplification devices synchronously.

关键词： photonic crystals one dimensional dielectric properties dielectric constant photonic band gap

PKA原子和SKA原子对同位素(溅射)富集度的贡献分析

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物理学报 2004年第5期53卷 1577-1582页

作者：郑里平张虎勇王庭太马余刚中国科学院上海应用物理研究所

用MonteCarlo模拟方法 ,分析了PKA原子和SKA原子对同位素 (溅射 )富集度的贡献。对于低能零剂量6 3Cu0 56 5Cu0 5溅射 ,同位素富集度是SKA原子的动量不对称性贡献 .对于低能零剂量92 Mo0 51 0 0 Mo0 5溅射 ,是PKA原子的动量不对称... 详细信息

用MonteCarlo模拟方法 ,分析了PKA原子和SKA原子对同位素 (溅射 )富集度的贡献。对于低能零剂量6 3Cu0 56 5Cu0 5溅射 ,同位素富集度是SKA原子的动量不对称性贡献 .对于低能零剂量92 Mo0 51 0 0 Mo0 5溅射 ,是PKA原子的动量不对称性贡献 .

关键词：动量不对称性同位素富集度溅射蒙特卡罗模拟 PKA原子 SKA原子

Properties of MillimeterWaves Interacting with Biomacromolecules in Living Systems

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Properties of MillimeterWaves Interacting with Biomacromolec...

Glass formation of ternary Sm-based Sm-Al-Co bulk metallic glasses

第十四届全国电磁兼容学术会议

作者： Pang Xiao-feng and Zhang An-ying Institute of Life Science and Technology,University of Electronic Science and Technology of china,Chengdu 610054,china,and international centre for materials physics,chinese academy of sciences,shenyang 110015,P.R china

＜正＞ As known, we now come in the electromagnetic and electronic times. A variety of electronicand electric instruments, equipments, materials and components as well as television station andradiobroadcast stations, and so on, have been extensively used in mills and countryside and *** the electromagnetic waves or fields accompany always with us from morning to *** a case it is very necessary to know whether the electromagnetic waves including microwaves

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来源： cnki会议评论

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international Journal of Minerals,Metallurgy and materials 2007年第S1期15卷 50-53页

作者： Jiang Wu1), Qing Wang1), Weirong Chen1), Qingyu Zhang1), Jianbing Qiang1), and Chuang Dong1,2) 1) State Key Lab of materials Modification, Dalian University of Technology, Dalian 116024, china 2) international Center of materials physics, chinese academy of sciences, shenyang, 110016, china

Ternary Sm-based Sm-Al-Co alloys at specific compositions designed using an e/a- and cluster-related criteria exhibit high glass forming abilities and form bulk glassy rods of 3 mm in diameter by a copper mold suction-casting method. Four composi- tions of bulk metallic glasses (BMGs) are Sm50Al25Co25, Sm52Al24Co24, Sm54Al23Co23 and Sm56Al22Co22, which all satisfy a constant conduction electron concentration of 1.5. Among them, the BMG exhibiting the largest reduced glass transition temperature (Trg) is Sm50Al25Co25, which reaches 0.648. The glass transition temperature Tg and the onset crystallization temperature Tx of this alloy are respectively 579 and 640 K at a heating rate of 20 K/min.

关键词： Sm-based alloys bulk metallic glasses alloy design cluster line electron concentration

Cluster-based composition rules for ternary alloy systems

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international Journal of Minerals,Metallurgy and materials 2007年第S1期15卷 1-3页

作者： Chuang Dong1, 2), Qing Wang1), Weirong Chen1), Qingyu Zhang1), Jianbing Qiang1), and Yingmin Wang1) 1) State Key Laboratory of materials Modification, Dalian University of Technology, Dalian 116024, china 2) international Center for materials physics, chinese academy of sciences, shenyang 110016, china

The cluster-based composition rule in ternary alloy systems including quasicrystals, bulk metallic glasses, crystalline phases and Lave phases-related body-centered cubic (BCC) solid solution forming systems was summarized. The so-called cluster line in a ternary phase diagram refers to a straight composition line linking a specific binary cluster to the third element. The compo- sition ranges of quasicrystals and bulk metallic glasses can be determined by the direct use of cluster lines, where two cluster lines intersect at the optimum phase forming composition. Furthermore, the alloys on the cluster line in Laves phase-related BCC solid solution alloy systems have larger hydrogen storage capacities.

关键词： cluster line composition design quasicrystals bulk metallic glasses hydrogen storage alloys

Effects of icosahedral phase formation on the microstructure and mechanical improvement of Mg alloys:A review

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Progress in Natural Science:materials international 2012年第5期22卷 364-385页

作者： D.K.Xu,E.H.Han State Key Laboratory for Corrosion and Protection,Institute of Metal Research,chinese academy of sciences,62 Wencui Road,shenyang 110016,china State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences 62 Wencui Road Shenyang 110016 China

Icosahedral phase(I-phase) is a relatively excellent strengthening phase in Mg *** on their volume fraction,the yield strength of Mg-Zn-Y-Zr alloys can vary from 150 to 450 MPa at room ***,the formation of I-phase has been considered as one of the most effective methods for developing high strength lightweight Mg alloys for automotive and aerospace *** this review article,a series of research work about I-phase containing Mg alloys have been systematically investigated including I-phase formation mechanism and their effects on mechanical properties of Mg *** emphases have been given to:(1) Structure of I-phase and its orientation relationship with the a-Mg matrix.(2) Influence of alloying elements and solidification conditions on I-phase formation.(3) Effects of I-phase on microstructural evolution and mechanical improvement of Mg-Zn-Y-(Zr) ***,the applications of I-phase for the mechanical improvement of other Mg alloys such as AZ91 and super-lightweight Mg-Li alloys are also reviewed.

关键词： Icosahedral phase Mg alloys Mechanical properties Microstructural evolution