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Preparation and Electrochemical Properties of Porous Platinum Electrode

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贵金属 2012年第A01期33卷 79-84页

作者： HE Xin CHEN Boxun CHEN Qiao General Research Institute for Nonferrous Metals GRIKIN Advanced Materials Co.Ltd.Beijing 100088China

Porous platinum electrodes were prepared by adding YSZ,as an active material,in platinum *** between microstructure and electrochemical performance of O 2(g),Pt/YSZ electrode have been characterized by SEM and cyclic *** showed that the microstructure of platinum electrode is a significant impact on the cyclic *** the increase of platinum electrode's porosity,the area of three-phase boundary of O 2(g) /Pt/YSZ was *** electrochemical reactivity was also *** were presented as the increase of current density and cathode voltage in cyclic voltammetry.

关键词： porous platinum electrode electrochemical performance microstructure cyclic voltammetry

Novel twinned Al3Sc dendrites in as-casted Al-Sc alloy

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Rare Metals 2023年第3期42卷 838-843页

作者： Xing-Quan Wang Yu Wang Qian Jia Zhao-Chong Ding Jin-Jiang He Song-Xiao Hui State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing 101407China grikin advanced material co. Ltd. Beijing Technology Research Center for Sputtering Target material Engineering of High Pure Metals

Al-Sc alloys with high Sc contents are served as sputtering targets for making high-performance piezoelectric *** micro structure of these alloys would affect the sputtering process and the final quality of the functional *** this study,the microstructure in as-c as ted Al-20%Sc(in atomic ratio)alloys is characterized and the feathery Al3Sc grains with twin relationships are reported for the first *** crystallographic features of twined structures and growth directions are quantitatively analyzed by electron backscatter diffraction(EBSD)technique.

关键词： Al3Sc alloys twin

Preparation and Properties of AlSi1Cu0.5 Alloy

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Journal of Rare Earths 2005年第S1期23卷 646-648页

作者：余前春王欣平李勇军 grikin advanced materials co. ltd. General Research Institute for Non-ferrous Metals Beijing 102200 China

The microstructure of casting AlSi1Cu0.5 alloy was investigated as well as the microstructure and the properties of AlSi1Cu0.5 alloy treated by deformed processing and heat treatment. The results of experiments demonstrate that casting AlSi1Cu0.5 alloy is inhomogeneous and the microstructure is dendritic; by deformed processing and heat treatment, the distribution of Si and Cu elements is improved and the grain size is below 100 μm.

关键词： AlSiCu alloy heat treatment deformed processing microstructure

Application of the O-line model to martensite crystallography

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Science China(Technological Sciences) 2012年第2期55卷 464-469页

作者： GU XinFu ZHANG WenZheng Laboratory of advanced materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China grikin advanced materials co. LtdBeijing 102200China

The O-line model is usually applied to precipitation *** application to investigation of martensite crystallography has received little *** this paper,the relationship between O-line model and the prism matching model for martensite crystallography is *** formulas in the O-line model are applicable to martensite *** solution of the habit plane corresponding to the minimum shape strain has been derived.A calculation example of {3 10 15}f martensite in a ferrous alloy is *** the results are in agreement with the former models for martensite crystallography,the advantage of O-line model is that it offers analytical solutions,facilitating further systematic investigations.

关键词： habit plane O-line model martensite crystallography PTMC

In situ atomic-scale observation of dislocation behaviors in twin-structured Pt nanocrystals

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Science China(Technological Sciences) 2021年第3期64卷 599-604页

作者： GUO YiZhong SUN Tao FU LiBo HAO LongHu HUANG Ming WEI RuJian LUO JunFeng HE Xin WANG XingQuan XIONG XiaoDong WANG LiHua HAN XiaoDong Beijing Key Lab of Microstructure and Property of advanced materials Institute of Microstructure and Properties of Advanced MaterialsBeijing University of TechnologyBeijing 100124China grikin advanced materials co. LTD.Beijing 102200China

The deformation mechanisms of twin-structured metallic materials have attracted great *** previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly affect the deformation of twinstructured metals,it remains unclear whether this prediction applies to experimental *** this paper,the atomic-scaled deformation process of twin-structured Pt nanocrystals was in situ observed using our home-made device in a high-resolution transmission electron *** have shown that the plastic deformation of the twin-structured Pt nanocrystals was governed by full dislocation generation as well as Lomer dislocation(LD)lock formation and *** LD locks were destructed,these full dislocations tended to move towards the surface of the *** findings revealed that due to the ultra-high repulsive force of TB on dislocation,there was no dislocation-TB reaction during the *** findings can enrich our understanding of the dislocation behaviors of twin-structured nanocrystals.

关键词： deformation mechanism repulsive force twin boundary dislocations in situ

Characterization of phases in Mg-10Y-5Gd-2Zn-0.5Zr alloy processed by heat treatment

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Transactions of Nonferrous Metals Society of China 2010年第11期20卷 2076-2080页

作者：王渠东高岩尹冬弟陈长江 National Engineering Research Center of Light Alloys Net Forming Shanghai Jiao Tong University grikin advanced materials co. LtdBeijing General Research Institute of None-ferrous Metals

Characterizations of phases in Mg-10%Y-5%Gd-2%Zn-0.5%Zr （WGZ1052） alloy during heat treatments were investigated by OM, XRD, SEM and EDS. The mechanisms of microstrucmre evolution were discussed. The results show that, after high temperature heat treatments, the Mg12ZnY phases still exist. During solution-treatment at 535 ~C, the amount of the long-period stacking order structures decreases. At 545℃ for 20 h and 24 h, there are still remnant Mg12ZnY compounds in the Mg matrix, the shape of which does not change and the amount does not decrease obviously.

关键词： Mg-Y-Gd-Zn alloy long-period stacking order heat treatment

Retrogression characteristics of a novel Al-Cu-Li-X alloy

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International Journal of Minerals,Metallurgy and materials 2010年第5期17卷 624-628页

作者： Zhi-shan Yuan Zheng Lu Xiu-liang Wu You-hua Xie Sheng-long Dai Chang-sheng Liu grikin advanced materials co. ltd. General Research Institute for Non-Ferrous Metals Beijing 100088 China Beijing Institute of Aeronautical materials Beijing 100095 China School of materials ＆ Metallurgy Northeastern University Shenyang 110004 China

Retrogression characteristics of a novel Al-Cu-Li-X alloy of 2A97 were studied by hardness testing, transmission electron microscopy （TEM）, and differential scanning calorimetry （DSC）. The retrogression treatments of aging at 155°C for 12 h followed by aging at 220 and 240°C were chosen by determining the peak temperature of δ＇ precipitation at 230°C by DSC. The retrogression treatment at a lower temperature of 220°C causes the precipitation and coarsening of δ＇ and θ＇ phases in the matrix, resulting in an increase in hardness. Retrogression at a higher temperature of 240°C causes the dissolution and coarsening of δ＇ and θ＇ precipitates in the matrix and on the grain boundaries, resulting in a decrease in hardness. Microstructural changes upon retrogression including the appearance of equilibrium precipitates such as T1, T2, δ＇, and θ are confirmed by the selected area electron diffraction and the bright and dark field image analysis.

关键词： retrogression artificial aging aluminum-lithium alloy microstructure

A new type of inferior vena cava filter and its animal experiment

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广东有色金属学报 2005年第2期15卷 356-361页

作者：于学保柳美荣郭锦芳扈玉玲 General Research Institute for Nonferrous Metals Grikin Advanced Materials Co . Ltd . Beijing 100088 China

This article explains the definition of pulmonary embolism as well as its causes and elaborates on a new type of inferior vena cava filter(VCF)we have developed. Shaped like a waistdrum, the VCF is mainly made of TiNi shape memory alloy-wire. It has a subulate wire frame which can intercept the thrombus on each side. Its medial body is made up of straight shape memory alloy-wire . Every pillar is bound by several shape memory alloy springs. This type of inferior vena cava filter has a good resistance to fatigue and is hard to be broken. Through animal experiments its framework has been proved to be lasting. Neither deformation nor fragmentation happened when the VCF had been kept in the body for a long time. The thrombus interception efficiency of our VCF is higher than imported VCFs. The filter is unfavorable for thrombosis. After implantation, the IVC was completely unimpeded and no displacement occurred. Moreover the VCF did little damage to the Wall of vein. Neither IVC perforation nor haematoma occurred after the operation.

关键词：静脉滤波器形状记忆合金肺部栓子

Biocompatibility evaluation of NiTi SMA stent via intervenient therapy

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广东有色金属学报 2005年第2期15卷 363-368页

作者：冯景苏刘坤鹏寇亚明 General Research Institute for Non-ferrous Metals Grikin Advanced Materials Co .Ltd .Beijing 102200 China

NiTi shape memory alloy (SMA) stent with film are the long-term implanted medical devices which could be used in human’s organ, such as esophagus, bile duct, urethra-prostate and blood vessel, by intervene therapy. It is very important to have a good biocompatibility for implanted device. According to standard ISO 10993, we completed biocompatibility evaluation of NiTi stent that included following tests: cytotoxicity, sensitization, genotoxicity, hemolysis and acute systemic toxicity. The results of tests qualify the NiTi stent, and provide an optimistic conclusion for the eventual use of NiTi stent as implanted medical devices.

关键词：生物材料生物适应性食管狭窄镍钛治疗效果