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Segregation of Liquid Phase in the Extruded Semisolid Metal

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Journal of Materials Science & Technology 2003年第3期19卷 209-212页

作者： Zhao YANG,Haifeng ZHANG,Aiming WANG,Bingzhe DING Zhuangqi HU shenyang National Lab.for Materials Science,Institute of Metal Research,Chinese Academy of Sciences, shenyang 110016,China Lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The influence of stress and strain on the solid/liquid segregation formed in deformed semisolid metal was ***compression experiment at a low constant strain rate was conducted on a Gleeble 15.0 thermo-mechanical sireulator.The stress and strain fields of the samples were calculated by finite element *** experiment results and themodeling results prove that the hydrostatic pressure gradient is the driving force for solid/liquid ***segregated liquid phase usually agglomerates in the micropores and shear bands are created by sliding of equiaxeddendrite *** sliding among the grains is influenced by the solid fraction and grain size of the semisolid slurry,so as the solid fraction and grain size change,the morphology of the segregated liquid changes.

关键词： Semisolid metal Solid/liquid segregation Hydrostatic pressure Sliding of grains

EFFECT OF METAL-OXIDE DIFFUSION BARRIER ON INTERDIFFUSION OF ELEMENTS BETWEEN COATING AND SUBSTRATE

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Acta Metallurgica Sinica(English Letters) 1991年第9期4卷 174-178页

作者： SUN Biwu GUAN Hengrong SUN Xiaofeng (Institute of Metal Research,Academia Sinica,shenyang)LI Tiefan (Institute of Corrosion and Protection of Metals,Academia Sinica,shenyang) Acad Sinica Shenyang China

The effect of LPPS Ni_3Al-Y_2O_3 diffusion barrier layer on interdiffusion of elements between coating and substrate has been *** was found that the retardation of interdiffusion is related to the amount of oxide in the diffusion barrier *** retardation is not remark- able when the content of Y_2O_3 is 8 wt-%,whereas the diffusion of Al,Co or Cr has all been notably retarded when the content of Y_2O_3 reaches 30 wt-%.The retardation effect of diffu- sion barrier is different for different elements such as Al,Co or Cr.

关键词： coating diffusion barrier diffusion

Combination of drainage, water supply and environmental protection as well as rational distribution of water resource in Zhengzhou mining district

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Science China Earth Sciences 2005年第10期48卷 1768-1779页

作者： WU Qiang1, LI Duo1,2, DI Zhiqiang3, MIAO Ying3, ZHAO Suqi4 & GUO Qiwen5.1. Resource Exploitation Engineering College, CUMT, Beijing 100083, China 2. Shijiazhuang Engineering College, University of Economics, Shijiazhuang 05.031, China 3. shenyang Institute of Geology and Mineral Resources, shenyang 110032, China 4. State Adminstration of Coal Mine Safety, Beijing 100013, China 5. Zhengzhou Coal Mine Company (Group), Zhengzhou 45.371, China Resource Exploitation Engineering College CUMT Beijing China Shijiazhuang Engineering College University of Economics Shijiazhuang China shenyang Institute of Geology and Mineral Resources shenyang China State Adminstration of Coal Mine Safety Beijing China Zhengzhou Coal Mine Company (Group) Zhengzhou China

The geological condition of coalfield is much complex in China. With increasing in mining depth and drainage amount, the contradiction of drainage, water supply and environ-mental protection is becoming more and more serious. However, the contradiction can be solved by the scientific management of optimizing combination of drainage, water supply and environ-mental protection. The Philip multiple objectives simplex method used in this article has searched for a possible solution at the first step, and then it goes on searching to find out whether there is a weight number that can lead the solution to the biggest. It can reduce the randomness and diffi-culty of traditional weight method which determine the weight number artificially. Some beneficial coefficients are vague and the number is larger in the model of water resource dispatch. So the vague layer analysis method can consider these vague factors fully, combining the qualitative and quantitative analysis together. Especially, this method can quantify the experiential judge-ment of policy decider, and it will turn to be more suitable if the structure of objective factors is complex or the necessary data are absent. In the paper, the two methods above are used to solve the plans of drainage, water supply and optimizing distribution of water resource in the Zhengzhou mining district.

关键词： combination of drainage, water supply and environmental protection, Philip multiple objective simplex method, vague layer analysis method, distribution of water resource.

Microstructure Evolution in a Rapidly Solidified Cu85.e15.Alloy Undercooled into the Metastable Miscibility Gap

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Journal of Materials Science & Technology 2005年第5期21卷 759-762页

作者： Jie HE and Jiuzhou ZHAOInstitute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A model has been developed to describe the microstructure evolution in the atomized droplets of Cu-Fe alloy during cooling through the metastable miscibility gap. Calculations have been performed for Cu85.e15.alloy to investigate the process of liquid-liquid phase transformation. The numerical results indicate that the minority phase droplets are nucleated in a temperature region around the peak of the supersaturation. The average radius of the Fe-rlch droplets decreases and the number density of the minority phase droplets increases with decreasing the atomized droplet size. The simulated results were compared with the experimental ones. The kinetic process of the liquid-liquid phase transformation was discussed in detail.

关键词： Cu-Fe alloy Metastable miscibility gap Liquid-liquid phase transformation Microstructure evolution Modeling

316L Austenite Stainless Steels Strengthened by Means of Nano-scale Twins

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Journal of Materials Science & Technology 2010年第4期26卷 289-292页

作者： G.Z. Liu, N.R. Tao and K. Lu shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China [a] shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences shenyang 110016 China

By means of dynamic plastic deformation （DPD） followed by thermal annealing, a mixed structure of micro-sized austenite grains embedded with nano-scale twin bundles （of about 20% in volume） has been synthesized in a 316L stainless steel （SS）. Such a 316L SS sample exhibits a tensile strength as high as 1001 MPa and an elongation-to-failure of about 23%. The much elevated strength originates from the presence of a considerable number of strengthening nano-twin bundles, while the ductility from the recrystallized grains. The superior strength-ductility combination achieved in the nano-twins-strengthened austenite steel demonstrates a novel approach for optimizing the mechanical properties in engineering materials.

关键词： Nano-scale twins Strength-ductility combination Dynamic plastic deformation (DPD) Stainless steels

Development in Conducting Bus of RE-Al Alloys

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Rare Metals 2001年第2期20卷 107-111页

作者： Jizhou Wang, Jingxia Li, Lu Shi, Zhenzhong Tai (Material and Metallurgical College, Northeastern University, Shopna 110015. China shenyang ASTRON Mining Ltd. Corp., shenyang 110003, China) NE Univ Mat & Met Coll Shenyang 110015 Peoples R China shenyang ASTRON Min Ltd Corp Shenyang 110003 Peoples R China

Four kinds of deformed aluminum alloys were tested. One kind of RE-Al-Mg-Si alloy, which possessed high conductivity and strength, was the first priority by contrast test. The large specification bus of conducting aluminum alloys was made by thermomechanical process during the industrial experiment. The properties of the bus are as follows: the tensile strength sigma (b) is 238 MPa, the conductivity (v.s. IACS) is 5..3%, and the current-carrying capacity is beyond 3.1 kA during working process. This kind of RE-Al alloy bus has been applied to several electrical transmitting and transforming work.

关键词： rare earth element aluminum alloy conducting bus thermomechanical process

NEW LATE SILURIAN OSTRACODE GENERA FROM CENTRAL NEI MONGOL WITH A DESCRIPTION OF A NEW FAMILY, AULACOBAIRDIIDAE

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微体古生物学报 1991年第2期 132-140页

作者： Zhang Li-jun (shenyang lnstitute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, shenyang 110032)

Here described are five new genera and nine new species of Ostracoda from the Upper Silurian Xibiehe Formation of the Baorhantu and Bate’ aobao sections in Darhan Muminggan Lianheqi, Nei Mongol. A new family Aulacobairdiidae of Paleozoic marine Ostracoda is proposed in this paper. Damaoqiella bicarinata, Heterobairdia glypta, Aulacobairdia biconvexa, A. sinuosa, Glossoparacypris prolata, G. constricta, Pseudothrallella

关键词： AULACOBAIRDIIDAE NEW LATE SILURIAN OSTRACODE GENERA FROM CENTRAL NEI MONGOL WITH A DESCRIPTION OF A NEW FAMILY NEI

Investigation on the High Temperature Internal Friction of a Subperitectic Al-Zr Alloy in Precipitating Process of ZrAl_3

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Rare Metals 1989年第3期9卷 20-26页

作者： Teng Gongqing Huang Changzhi Department of Physics,Northeast University of Technology,shenyang,China Northeast Univ of Technology China

An inverted torsion pendulum has been used to study the high temperature internal friction of an Al-0.22wt% Zr *** experimental result has shown that the grain boundary internal friction peak shifted to lower temperature,the peak height des- cended and the activation energy related to this peak increased in the precipitating process of ZrAl_3 particle in the ***- while,the high temperature background descended so obviously as to be separated from the grain boundary internal *** internal friction peak caused by diffusion around ZrAl_3 particles has been *** mechanism of improvement of proper. ties of aluminium alloys containing a small amount of zirconium has also been discussed.

关键词： Zr Al

BEHAVIOR OF Mg AND ITS EFFECT ON MECHANICAL PROPERTIES OF CAST Fe_3Al ALLOYS

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Acta Metallurgica Sinica(English Letters) 1993年第6期6卷 353-357页

作者： YIN Weimin GUO Yianting HU Zhuangqi Institute of Metal Research,Academia Sinica,shenyang,China professor,Institute of Metal Research,Academia Sinica,shenyang 110015.China Inst of Metal Research Shenyang China

Proper addition of 0.002 wt-% Mg to cast Fe_3Al alloy may obviously improve the room and high temperature tensile *** spectra show that Mg segregates near grain boundaries as very thin *** under TEM reveals that a suitable amount of Mg enhances ability of cooperative internal deformation so that the dislocations will ease the con- tinuous slip deformation through grain *** fracture feature of Fe_3Al alloy is of transgranular cleavage at room temperature and cracks initiate at grain boundaries.

关键词： Fe_3Al intermetallic compound microalloying mechanical property