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A new type of rare earth elements deposit in weathering crust of Permian basalt in western Guizhou, NW China

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Journal of Rare Earths 2008年第5期26卷 753-759页

作者：杨瑞东王伟张晓东刘玲魏怀瑞鲍淼王敬欣 Guizhou University research institute of Science and Technology Information General Research Institute for Non-ferrous Metals

A new type of rare earth elements （REEs） deposit was discovered from the gaolinite mudstone in the weathering crust of Permian basalt, Bijie region, western Guizhou, China. It contained ∑RE2O3 0.065%-1.086%. This type of REEs deposit was widely distributed with steady horizon and thickness of 3-4 m. The ore-bearing weathering crust （kaolinite） of the three discovered REEs deposits belonged to the third episode of the Emeishan basalt eruption. The new type of REEs deposit was suggested that basalt （tuff） weathering could lead to the enrichment of the rare earth elements. Therefore, it is of important economic significance to explore REEs deposits in the weathering crust of basalt （tuffs） in Yunnan, Guizhou, and Sichuan Provinces.

关键词： rare earth elements deposits weathering crust basalt (tufts) upper Pemaian Guizhou Province

Effect of one-step aging on microstructure and properties of a novel Al-Zn-Mg-Cu-Zr alloy

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Science China(Technological Sciences) 2009年第1期52卷 67-71页

作者： LI XiWu XIONG BaiQing ZHANG YongAn HUA Cheng WANG Feng ZHU BaoHong LIU HongWei State Key Laboratory for Fabrication and Processing of non-ferrous metals General Research Institute for Non-ferrous MetalsBeijing 100088China

The effect of one-step aging temper on the mechanical properties, electrical conductivity and the microstructure of a novel Al-7.5Zn-1.6Mg-1.4Cu-0.12Zr alloy has been investigated. The results indicated that with elevating the aging temperature from 100°C to 160°C, the aging response rate was greatly accelerated, and the UTS at peak aging condition decreased, while the corresponding TYS increased. However, the electrical conductivity of the alloy became higher. After aging for 24 h at 120°C, the peak UTS and TYS values were achieved as 591 MPa and 541 MPa, respectively; but the alloy achieved a lower conductivity, 20.4 MS/m. When T6 temper was performed at 140°C for 14 h, the UTS decreased only by 1% of the former, whereas the TYS and the electrical conductivity increased obviously, which were up to 559 MPa and 22.6 MS/m, respectively. The major strengthening precipitates of the peak-aged alloy were GP zones and η′ phase. The precipitates in both the matrix and the grain boundary became coarser with rising aging temperature. There were obvious PFZs along the grain boundary both in T6 conditions aged at 140°C and 160°C.

关键词： Al-Zn-Mg-Cu alloy one-step aging properties microstructure

Fabricating Buffer Layers for YBa_2Cu_3O_y Coated Conductor by Surface Oxidation Epitaxy

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Journal of Rare Earths 2005年第4期23卷 514-516页

作者：杨坚刘慧舟古宏伟屈飞范红雁 Superconducting Materials research Center General Research Institute for Non-Ferrous Metals Beijing100088 China research and Development Department General Research Institute for Non-Ferrous Metals Beijing 100088 China

NiO buffer layers were formed on a tape of Ni for making YBCO coated conductor by surface-oxidation epitaxy （SOE） process. Different oxidizing conditions such as temperature and duration were studied for Ni tapes. It is found that the texture of NiO could be affected directly by the orientation and surface of substrate. X-ray diffraction （XRD） 2-2θ scan, φ-scan, and pole figure were employed to characterize the in-plane alignment and cube texture. X-ray φ-scan shows that NiO film is formed on Ni tape with high cube texture and a typical value at the full width at half maximum （FWHM） is ≤ 7.5°. Scanning electron microscopy was used to study the surface morphology of NiO films. No crack is found and the films appear dense. Such technique is simple and of low cost with perfect reproducibility, promising for developing long tapes.

关键词： metal material cube texture surface-oxidation epitaxy NiO buffer layer rare earths

IN SITU OBSERVATION OF DEFORMATION AND CRACK PROPAGATION IN DOPED TUNGSTEN WIRE

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Science China Mathematics 1985年第4期28卷 432-440页

作者：李永洪徐炜刘安生邵贝羚 Beijing General research institute of non-ferrous metals

It has been proved in our early work that the excellent sag resistance of doped tungsten wire mainly resulted from interaction between dislocations and dispersed potassium bubbles contained in doped tungsten wire. This work presents in situ observations under high voltage electron microscope (HVEM) that potassium bubbles obstruct moving dislocations and bend them and that dislocations are unpinned from potassium bubbles and move again. The role of potassium bubbles in crack nucleation and fracture has also been revealed in in situ tensile experiments. The whole process of crack nucleating at a grain boundary has been recorded. The experiments show that microeracks spread along potassium bubble rows in side grains as well as along grain boundaries. Thus, it is very important for the doped tungsten wire production to control the potassium bubble size and distribution and to make the bubble rows as fine and uniform as possible with the help of adequate deformation and heat treatment.

关键词： IN SITU OBSERVATION OF DEFORMATION AND CRACK PROPAGATION IN DOPED TUNGSTEN WIRE high 110

MATHEMATICAL　MODELLING　OF　BUBBLE　DRIVENFLOWS　IN　A　NOVEL　ALUMINUM　ELECTROLYSIS　CELL

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中国有色金属学会会刊：英文版 1996年第2期6卷 37-40页

作者： Gao Zhaosheng Li Guoxun Shen Jianyun(Beijing General research institute for non-ferrous metals, Beijing 100088) Beijing General research institute for non-ferrous metals Beijing 100088 China

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关键词： mathematical modelling fluid flow aluminum electrolysis cell k-ε model

Enhancement of cerium and hydrogen storage property of a low-cost Ti-V based BCC alloy prepared by commercial ferrovanadium

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Journal of Rare Earths 2010年第5期28卷 781-784页

作者：米菁吕芳刘晓鹏蒋利军李志念王树茂 Energy Material and Technology research Department General Research Institute for Non-Ferrous Metals

Based on the analysis of XRD, SEM, P-C-isotherm measurements and absorption kinetics simulation, it was indicated that Ce addition was an effective way to inhibit the formation of C14 Laves phase, improve flatness of the plateau, increase hydrogen diffusion rate and enlarge hydrogen storage capacity. The hydrogenation capacity of Ti27.25Cr28.05V37.25Fe7.45Ce1.0 alloy prepared by commercial ferrovanadium was 3.56 wt.% measured at 298 K. The dehydrogenation capacity was 2.25 wt.% and 2.54 wt.% measured at 343...

关键词： hydrogen storage materials low cast alloy BCC alloy rare earths

Enhanced strength and ductility of Mg-Gd-Y-Zr alloys by secondary extrusion

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Journal of Magnesium and Alloys 2013年第1期1卷 54-63页

作者： X.Li W.Qi K.Zheng N.Zhou guangzhou research institute of non-ferrous metals Guangzhou 510651China

The Mg-12Gd-3Y-0.6Zr(GW123,wt.%)alloy was prepared by cast,and thermo-mechanically treated by single and secondary hot extrusion *** microstructure,texture and mechanical properties of the extruded alloy were *** results show that in different treated conditions the microstructure is mainly composed ofα-Mg solid solution and second phases of Mg_(3)Y_(3)Gd_(2) and Mg_(5)(GdY)*** best mechanical properties are achieved in the secondary extruded alloy after ageing,with the ultimate tensile strength(UTS),tensile yield strength(TYS)and elongation(ɛ)being 446 MPa,350 MPa and 10.2%at room temperature.A weak texture aligned with〈101¯0〉||ED(extrusion direction)component and spread from〈101¯0〉to〈112¯0〉poles was obtained in secondary extrusion,which is caused by the occurrence of dynamic recrystallization(DRX)in shear bands for texture *** fracture modes in extruded GW123 alloy are mixed pattern of transgranular and intergranular fracture,as well as cleavage *** strengthening mechanisms were quantitatively analysed from the different aspects using the measured microstructural *** grain boundaries and solid solution strengthening were the main contributors to the high tensile strength of the GW123 alloy.

关键词： Mg-Gd-Y-Zr magnesium alloy Microstructure Texture Mechanical properties Rare earth Dynamic recrystallization

Crystallization behavior of Ti_(61.67) Zr_(17.15)Ni_(14.80)Cu_(6.38) glass-forming alloy

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中国有色金属学会会刊：英文版 2004年第1期14卷 156-160页

作者：范金铎高逸群黎仕增 Beijing General research institute for non ferrous metals institute of Precious metals Guangxi institute of Mechanical & Electrical Technology

Ti 61.67 Zr 17.15 Ni 14.80 Cu 6.38 (atom fraction, %) metallic glass has applications in brazing. Using the hammer and anvil technique, Ti 61.67 Zr 17.15 Ni 14.80 Cu 6.38 metallic glass was prepared. The crystallization behavior for this metallic glass was investigated by differential scanning calorimetry(DSC), X ray diffractometry(XRD) and transmission electron microscopy(TEM). There are three stages in DSC curves of crystallization. The reduced glass temperature T rg is 0.42. The kinetic parameters of crystallization were calculated by a set of equations of the maximum crystallization rate. The crystalline phase formed in the MSI(Metastable stage I) is Zr 2Cu, in the MSII is α Ti and in the MSIII is Ti 2Ni. This kind of alloy has lower glass forming ability, and the Ti 61.67 Zr 17.15 Ni 14.80 Cu 6.38 metallic glass has lower thermal stability.

关键词：钛合金非晶合金晶化动力学 TEM DSC XRD

Reaction Mechanism and Thermal Insulation Property of Al-deposited 7YSZ Thermal Barrier Coating

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Journal of Materials Science & Technology 2015年第10期31卷 1006-1010页

作者： Xiaofeng Zhang Kesong Zhou Wei Xu Jinbing Song Chunming Deng Min Liu School of Materials Science and Engineering South China University of Technology institute of New Materials Guangzhou Research Institute of Non-ferrous Metals

To increase the performance and efficiency of thermal barrier coating （TBC）, it is important to improve the thermal insulation property. In this work, a columnar AI film was deposited at the top of 7 wt% yttria- stabilized zirconia （7YSZ） TBC by magnetron sputtering. A vacuum heat treatment was then carried out to improve the insulation property of Al-deposited TBC. Reaction mechanism of AI-ZrO2 system in AIdeposited TBC was studied by differential thermal analysis （DTA）. The phase structures of the assprayed TBC, the Al-deposited and vacuum-treated TBC were characterized. The microstructure evolution of M-deposited TBC was illustrated after vacuum heat treatment. And the insulation property of the assprayed TBC and treated TBC was compared. The results show that a multi-scaled layer, consisting of micron/ nano structured α-Al2O3 and AI3Zr grain was in situ synthesized at the top of 7YSZ coating via vacuum heat treatment. The TBC with the multi-scaled overlay has better insulation property than the asspraved TBC.

关键词： Thermal barrier coatingAl deposition Insulation propertyc α-alumina