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A Monte-Carlo Approach to Cellular Pattern Evolution for Binary Alloys during Directional Solidification

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Journal of Materials Science & Technology 1995年第2期11卷 127-132页

作者： LIU, JM LIU, ZG WU, ZC Nanjing univ Nanjing China

A Monte-Carlo approach of cellular pattern evolution during directional solidification of a binary alloy has been carried out by imposing a non-uniform probability distribution of particle emission from the particle source, as an approach to the contribution of solute redistribution to the interface evolution. Both the bulk and interface diffusion have been involved in the simulation, and coarsening of the cellular patterns with time has been clearly revealed. The remarkable influence of the interface relaxation and the solute redistribution on the profile bf;solidifying interface has been presented.

关键词： Monte Carlo methods

DRY SLIDING WEAR OF PM Al-10Ti ALLOY

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中国有色金属学会会刊：英文版 1998年第3期8卷 66-71页

作者： Wu, Nianqiang Wu, Jinming Lin, Shuo Zhou, Jinqi Li, Zhizhang Zhejiang univ Hangzhou China

１ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｒｉｎｇｄｒｙｓｌｉｄｉｎｇｏｆｔｈｅａｌｕｍｉｎｕｍａｌｏｙｓａｎｄａｌｕｍｉｎｕｍｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓａｇａｉｎｓｔｓｔｅｅｌｓ，ｔｈｅｒｅｅｘｉｓｔｔｗｏｄｉｓｔｉｎｃ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｒｉｎｇｄｒｙｓｌｉｄｉｎｇｏｆｔｈｅａｌｕｍｉｎｕｍａｌｏｙｓａｎｄａｌｕｍｉｎｕｍｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓａｇａｉｎｓｔｓｔｅｅｌｓ，ｔｈｅｒｅｅｘｉｓｔｔｗｏｄｉｓｔｉｎｃｔｗｅａｒｒｅｇｉｍｅｓ，ｉ．ｅ．...

关键词： Al Ti alloy dry sliding wear delamination

ELECTROMAGNETIC CHARACTERISTICS OF LEVITATION MELTING WITH COLD CRUCIBLE

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中国有色金属学会会刊：英文版 1999年第2期9卷 183-188页

作者： Deng, Kang Zhou, Yueming Ren, Zhongming Gong, Tao Jiang, Guochang Shanghai univ Shanghai China

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｉｎｇｗｉｄｅｌｙｕｓｅｄｉｎｍｅｔａｌｕｒｇｙａｎｄｎｅｗｍａｔｅｒｉａｌｓｐｒｏｃｅｓｓｉｎｇ，ｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｌｅｖｉｔａｔｉｏｎｍｅｌｔｉｎｇｗｉｔｈｃｏｌ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｉｎｇｗｉｄｅｌｙｕｓｅｄｉｎｍｅｔａｌｕｒｇｙａｎｄｎｅｗｍａｔｅｒｉａｌｓｐｒｏｃｅｓｓｉｎｇ，ｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｌｅｖｉｔａｔｉｏｎｍｅｌｔｉｎｇｗｉｔｈｃｏｌｄｃｒｕｃｉｂｌｅｉｓａｖａｌｉｄ...

关键词： cold crucibleelectromagnetic inductionlevitation meltingnumerical simulation

CHEMICAL BEHAVIOR OF CERIUM ELEMENT IN ROCK WEATHERING SYSTEM

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中国有色金属学会会刊：英文版 1999年第1期9卷 160-166页

作者： Chi, Ru'an Zhu, Guocai Zhang, Ping Xu, Yinghui Tsinghua univ Beijing China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｅｌｅｃｔｒｏｎｉｃｓｔｒｕｃｔｕｒｅｏｆｇｒｏｕｎｄｓｔａｔｅａｔｏｍｃｅｒｉｕｍｉｓＸｅ４ｆ１５ｄ１６ｓ２，ａｎｄｔｈｅｅｌｅｃｔｒｏｎｉｃｓｔｒｕｃｔｕｒｅｏｆｔｒｉｖａｌｅｎｔ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｅｌｅｃｔｒｏｎｉｃｓｔｒｕｃｔｕｒｅｏｆｇｒｏｕｎｄｓｔａｔｅａｔｏｍｃｅｒｉｕｍｉｓＸｅ４ｆ１５ｄ１６ｓ２，ａｎｄｔｈｅｅｌｅｃｔｒｏｎｉｃｓｔｒｕｃｔｕｒｅｏｆｔｒｉｖａｌｅｎｔｏｘｉｄｉｚｉｎｇｓｔａｔｅｉｓＸ...

关键词： cerium rare earth ore weathering system chemical behavior

Effect of Accelerated Ageing on the Dielectric Behaviour of Some Varnish Dry Films

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Journal of Materials Science & Technology 1995年第5期11卷 323-328页

作者： S.A.El-Henawii(Faculty of Science, Helwan university, Cairo, Egypt) Helwan univ Cairo Egypt

The variation of the dielectric constant e' and the dielectric loss e' of polyesteramide, alkyd polyesteramide and alkyd varnish dry films were measured within the frequency range from 105 to 107 Hz and the temperature range from 20 to 50℃. The varnish films were subjected to accelerated ageing by heating at 110℃ for diferent durations. The efect of the accelerated ageing on e' and e' were measured. The activation energy and the entropy change of dielectric relaxation for the dry films before and after ageing were also calculated. All the results obtained were recorded and discussed in correlation with the molecular structure of the investigated varnishes.

关键词： Effect of Accelerated Ageing on the Dielectric Behaviour of Some Varnish Dry Films

Synthesis，Characterization，Crystal　Structure　and　Quantum　Chemistry　Calculation　of　the　Mixed　Ligand　Complexes　［Ln（CF_3COO）_3·（Phen）_2·（H_2O）_2］·CH_3COCH_3·H_2O

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Journal of Rare Earths 1995年第4期13卷 246-251页

作者：董南成义祥陆维敏王培筠黄幼青胡盛志 Hangzhou univ Hangzhou China

The complexes of rare earth trifluoroacetate with two 1, 10-phenanthroline Ln (CF_3COO)_3 ·(Phen )_2· CH_3COCH_3·3H_2O (Ln=La, Pr, Nd, Sm, Eu) have prepared in the mixed slovents of H_2O and CH_3COCH_3, and the single crystal Nd (CF_3COO)_3· (Phen )_2· CH_3COCH_3· 3H_2O was determined by four-circle X-ray diffractometer. The crystal is a monoclinic system with space group P2_1/n(14# ), a=0. 9253 ( 1 )nm , b=2. 1500 ( 2 ) nm , c=1.8981 ( 4 ) nm, β= 95. 28( 1 )°, V=3.760(8) nm￣3 , Z=4 , R=0. 035. The coordination number of Nd is 9 , and the coordination polyhedron of Nd atom is distorted tricapped triagonal prism. The electronic structures and chemical bonds of the complex Nd (CF_3COO)_3· (Phen )_2· CH_3COCH_3·3H_2O is studied by the spin unrestricted INDO method.

关键词： Lanthanide trifluoroacetate 1 10-phenanthroline Crystal structure Quantum chemistry calculation

Preparation　of　Yttrium－Barium－Copper　Trinary　Master　Alloys　by　Electrolysis　from　Molten　Fluoride－oxide

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Journal of Rare Earths 1995年第4期13卷 271-276页

作者：童叶翔刘冠昆杨绮琴洪惠婵 Zhongshan univ Guangzhou China

The electrochemical behaviour of Y￣(3+) and Ba￣(2+) on platinum and copper electrode in molten YF_3(70 wt% )-NaF (20 wt%)-CaF_2(10 wt%) has been studied by means of cyclic voltammetry. discharge curve and so on. The Y-Ba-Cu alloy is obtained by fused salt electrolysis with molten YF_3-NaF-CaF_2 as electrolyte and Y_2O_3 and BaO as raw materials. Graphite cell acted as an anode and copper rod as consumable cathode. The molten bath temperature was 1193 K. Cathode current density was 20 A/cm￣2. The contents of yttrium, barium and copper in alloy were about 20wt%, 9 wt% and 71 wt% respectively. Yttrium recovery efficiency was 90 wt%. The current efficiency was 70%～80 %.

关键词： Yttrium-barium-copper Trinary master alloys Electrolysis Molten fluoride-oxide

NUMERICAL MODELLING OF PROGRESSIVE FAILURE IN PARTICULATE COMPOSITES LIKE SANDSTONE

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中国有色金属学会会刊：英文版 1999年第1期9卷 167-173页

作者： Xing, Jibo Yu, Liangqun Zhang, Ruifeng Wang, Yongjia Yantai univ Yantai China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｎｕｍｅｒｉｃａｌｍｏｄｅｌｉｎｇｏｆｐｒｏｇｒｅｓｉｖｅｆａｉｌｕｒｅｉｎｐａｒｔｉｃｕｌａｔｅｃｏｍｐｏｓｉｔｅｓｉｓｉｍｐｏｒｔａｎｔｉｎｕｎｄｅｒｓｔａｎｄｉｎｇｔｈｅｍｅ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｎｕｍｅｒｉｃａｌｍｏｄｅｌｉｎｇｏｆｐｒｏｇｒｅｓｉｖｅｆａｉｌｕｒｅｉｎｐａｒｔｉｃｕｌａｔｅｃｏｍｐｏｓｉｔｅｓｉｓｉｍｐｏｒｔａｎｔｉｎｕｎｄｅｒｓｔａｎｄｉｎｇｔｈｅｍｅｃｈａｎｉｓｍｓｆｏｒｔｈｅｇｅｎ...

关键词： beam particle model particulate composites progressive failure meso structure

Mechanical Behaviors and Microstructural Characteristics of TC11 Alloy during Hot Deformation

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Rare Metals 2000年第2期19卷 101-109页

作者：孙新军白秉哲顾家林陈南平 Tsinghua univ Beijing China

The mechanical behaviors and the microstructural characteristics of TC11 alloy with quenched martensite microstructure during hot compressive deformation were investigated. It shows that at various temperatures and strain rates, the stress strain curves firstly exhibit strain hardening, then strain softening and finally reach the steady deformation state; in the meanwhile, the initial lamellar microstructure is transformed into the equiaxed and uniform one through dynamic recrystallization. It shows that the present TC11 alloy has different Z D relationships in relatively lower temperature (RLT) range and relatively higher temperature (RHT) range, which is believed to be due to different deformation activation energies. During RHT deformation, dynamic recrystallization occurs in both α phases and β phases, but during RLT deformation, dynamic recrystallization only occurs in α phases and in the meanwhile β phases undergo a process of precipitation and growth.

关键词： Z D relationship Hot deformation TC11 alloy Mechanical behaviors Microstructure