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Controllable synthesis of Ni-catalyzed tetragonal tungsten nanowires via chemical vapor deposition

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Progress in Natural science:materials International 2012年第5期22卷 514-519页

作者： Chao Wang a,Yuehui He a,Chaoqun Peng b,Shiliang Wang a,c,Xinli Liu a a State Key Laboratory of Powder Metallurgy,central south university,changsha 410083,china b School of Material science and engineering,central south university,changsha 410083,china c School of Physics science and Technology,central south university,changsha 410083,china [a] State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China [b] School of Material science and engineering Central South University Changsha 410083 China [c] School of Physics science and Technology Central South University Changsha 410083 China

Tetragonal single-crystal tungsten nanowires were successfully synthesized by chemical vapor deposition(CVD) catalyzed by Ni *** influences of the catalysts,temperature and growth time on the formation of the nanowires were *** was found that the tetragonal tungsten nanowires(WNWs) arrays were obtained by deterministic growth from the ordered Ni catalyst particles with one-to-one relation in size and position between the catalysts and *** large-scale tungsten nanowire arrays were synthesized at the low temperature of 950℃.Samples were characterized by X-ray diffraction(XRD),field-emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and high-resolution transmission electron microscopy(HRTEM).Increasing growth time at 950℃,the tip of the WNWs changed from four(211) planes to four(110) *** controls of the orientation and structure of WNWs arrays were important for adjusting their properties to satisfy different requirements of potential nanodevices.

关键词： Tungsten nanowires Ni catalysts Chemical vapor deposition Nanostructures

ORDER STATE AND STABILITY OF MARTENSITE IN AN AIR-QUENCHED Cu-Zn-Al ALLOY

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中国有色金属学会会刊：英文版 1996年第3期6卷 113-118页

作者： Wang Mingpu Jin Zhanpeng Yin Zhimin Xu Genyin(Department of materials science and engineering,central south university of Technology, changsha 410083 Anhui Institute of Technology, Hefei 230069) CENT S UNIV TECHNOL DEPT MAT SCI & ENGNCHANGSHA 410083PEOPLES R CHINA ANHUI INST TECHNOL HEFEI 230069PEOPLES R CHINA

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ＯＲＤＥＲＳＴＡＴＥＡＮＤＳＴＡＢＩＬＩＴＹＯＦＭＡＲＴＥＮＳＩＴＥＩＮＡＮＡＩＲ－ＱＵＥＮＣＨＥＤＣｕ－Ｚｎ－ＡｌＡＬＬＯＹ￥ＷａｎｇＭｉｎｇｐｕ；ＪｉｎＺｈａｎｐｅｎｇ；ＹｉｎＺｈｉｍｉｎ；ＸｕＧｅｎｙｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａ...

关键词： shape memory alloy Cu-Zn-Al alloy martensite ordering stabilization

Effect of Aging on Fracture Toughness and Stress Corrosion Cracking Resistance of Forged 7475 Aluminum Alloy

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Journal of Wuhan university of Technology(materials science) 2007年第2期22卷 191-195页

作者：李红英 School of materials science and engineering Central South University

The effects of two-stage aging and retrogression and reaging heat treatment on the fracture toughness and stress corrosion cracking resistance of 7475 alloy were studied. The fracture toughness, conductivity and strength of samples of nine groups under duplex aging conditions and three retrogression and reaging heat treatments were also measured. Incorporating the microstructure and property, we found that when the condition of the first order aging kept identical, the fracture toughness and stress corrosion cracking resistance increase with aging time and the second aging temperature. The optimal treatment conditions are （ 115℃×7h ＋ 185 ℃×13h） among all tested two-stage aging treatments. Although the 7475 alloy treated by RRA method shows the highest strength and its stress corrosion cracking resistance after twenty minutes retrogression can also reach the same level as those by the optimal treatment of （115℃×7h＋ 185℃×13h ）, the fracture toughness is even low.

关键词： 7475 alloy two-stage aging heat treatment RRA treatment fracture toughness stress corrosion

Synthesis and sintering of beryllium oxide nanoparticles

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Progress in Natural science:materials International 2010年第1期20卷 81-86页

作者： Xiao-feng WANG,Ri-chu WANG,Chao-qun PENG,Ting-ting LI,Bing LIU School of materials science and engineering,central south university,changsha 410083,china School of materials science and engineering Central South University Changsha 410083 China

BeO nanoparticles were prepared by polyacrylamide gel route and the sintering properties of synthesized powder as a function of sintering temperature and time were *** behaviors of the polyacrylamide gel and beryllium salt were studied by thermogravimetry analysis(TGA).The calcination temperature(690℃)of the beryllium sulfate covered in polyacrylamide xerogel was almost 150℃lower than that obtained by traditional *** nanocrystallites of the BeO particles were estimated by X-ray diffraction(XRD)according to Debye-Scherrer *** electron microscopy(TEM) investigation revealed that the average particle size of the BeO nanoparticles prepared by calcining at 800℃for 2 h,ranges from 15 nm to 25 *** sintering temperature was down to 1600℃,which was around 200℃lower than conventional sintering temperature of the compact sample with common *** densification rate was fast at the first 3 *** thermal conductivity of the sample sintered at 1600℃for 6 h was 186.6 W/(m·K).

关键词： BeO nanoparticles polyacrylamide gel sintering thermal conductivity

CONSTITUTION OF Al-BASE MULTI-COMPONENT QUASI-CRYSTALLINE ALLOYS

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中国有色金属学会会刊：英文版 1996年第4期6卷 61-66页

作者： Chen Zhenhua Jiang Xiangyang Zhou Duosan Wang Yun Huang Peiyun (Research Inititute of Non-Equilibrium materials science and engineering ,central south university of Technology, changsha 410083) CENT S UNIV TECHNOL RES INST NONEQUILIBRIUM MAT SCI & ENGNCHANGSHA 410083PEOPLES R CHINA

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ＣＯＮＳＴＩＴＵＴＩＯＮＯＦＡｌ－ＢＡＳＥＭＵＬＴＩ－ＣＯＭＰＯＮＥＮＴＱＵＡＳＩ－ＣＲＹＳＴＡＬＬＩＮＥＡＬＬＯＹＳＣｈｅｎＺｈｅｎｈｕａ；ＪｉａｎｇＸｉａｎｇｙａｎｇ；ＺｈｏｕＤｕｏｓａｎ；ＷａｎｇＹｕｎ；ＨｕａｎｇＰｅｉｙｕｎ（Ｒｅｓｅａｒｃｈ...

关键词： quasi-crystal Al-base alloy composition addition

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Preparation and electrochemical performance of spherical Fe_3O_4 as anode materials for Li-ion batteries

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science china(Technological sciences) 2009年第11期52卷 3219-3223页

作者： WANG FangBin, CHEN Jie, HUANG KeLong & LIU SuQin college of Chemistry & Chemical engineering, central south university, changsha 410083, china 1. college of Chemistry & Chemical engineering Central South University Changsha 410083 China

Fe3O4 nano-powder was prepared by the hydrothermal method. The structure and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The as-prepared powder has regularly spherical morphology, and the average size of product is about 25 nm. The possible application use of this material as the active mass of anode for rechargeable Li batteries was examined by cyclic voltammeter (CV), galvanostatic charge/*** experimental results showed that this material exhibited large specific capacity at the first cycle, and the discharge and charge capacity retention of this electrode are 37.04% and 48.76%, respectively. Furthermore, the impedance change of Fe3O4 electrode under different cycle number and potential was examined.

关键词： Fe3O4 lithium battery anode electrochemical performance

Microstructural evolutions of Cu(Ni)/AuSn/Ni joints during reflow

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Progress in Natural science:materials International 2011年第4期21卷 347-354页

作者： Xiao-feng WEI,Ri-chu WANG,Chao-qun PENG,Yan FENG,Xue-wei ZHU School of materials science and engineering,central south university,changsha 410083,china School of materials science and engineering Central South University Changsha 410083 China

Interfacial reactions of the Ni/AuSn/Ni and Cu/AuSn/Ni joints are experimentally studied at 330℃for various reflow *** microstructures and mechanical properties of the as-solidified solder joints are *** as-solidified solder matrix of Ni/AuSn/Ni presents a typical eutecticξ-(Au,Ni)5Sn+δ-(Au,Ni)Sn lamellar microstructure after reflow at 330℃for 30 *** reflow for 60 s,a thin and flat(Ni,Au)3Sn2intermetallic compound(IMC) layer is formed,and some needle-like(Ni,Au)3Sn2phases grow from the IMC layer into the solder *** the other hand,a cellular-typeξ(Cu) layer is found at the upper AuSn/Cu interface in the Cu/AuSn/Ni joint after reflow for 30 s,and a(Ni,Au,Cu)3Sn2IMC layer is also formed at the lower AuSn/Ni interface. For both joints the IMC layer grows significantly with the increase of reflow time,but the growth rate of(Ni,Au,Cu)3Sn2IMC in the Cu/AuSn/Ni joint is smaller than that of the(Ni,Au)3Sn2layer in the Ni/AuSn/Ni *** comparisons of the shear strength and fracture surface between the Ni/AuSn/Ni and Cu/AuSn/Ni joints suggest that the coupling effect of the Cu/AuSn/Ni sandwich joint is helpful to prevent the excessive growth of(Ni,Au)3Sn2,which in turn enhances the mechanical reliability of the solder joint.

关键词： Cu(Ni)/AuSn/Ni joints interfacial reaction intermetallic compound(IMC) coupling effect

A NOVEL MULTI-LAYER SPRAY DEPOSITION TECHNOLOGY

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中国有色金属学会会刊：英文版 1995年第4期5卷 73-78页

作者： Chen Zhenhua Huang Peiyun Jiang Xiangyang Wang Yun Peng Chaoqun(Research institute of Non-Equilibrium materials science and engineering,central south university of Technofogy,changsha 410083) central south Univ of Technology Changsha China

ＡＮＯＶＥＬＭＵＬＴＩ－ＬＡＹＥＲＳＰＲＡＹＤＥＰＯＳＩＴＩＯＮＴＥＣＨＮＯＬＯＧＹＣｈｅｎＺｈｅｎｈｕａ；ＨｕａｎｇＰｅｉｙｕｎ；ＪｉａｎｇＸｉａｎｇｙａｎｇ；ＷａｎｇＹｕｎ；ＰｅｎｇＣｈａｏｑｕｎ（Ｒｅｓｅａｒｃ... 详细信息

ＡＮＯＶＥＬＭＵＬＴＩ－ＬＡＹＥＲＳＰＲＡＹＤＥＰＯＳＩＴＩＯＮＴＥＣＨＮＯＬＯＧＹＣｈｅｎＺｈｅｎｈｕａ；ＨｕａｎｇＰｅｉｙｕｎ；ＪｉａｎｇＸｉａｎｇｙａｎｇ；ＷａｎｇＹｕｎ；ＰｅｎｇＣｈａｏｑｕｎ（ＲｅｓｅａｒｃｈｉｎｓｔｉｔｕｔｅｏｆＮｏｎ－Ｅ...

关键词： multi-layer spray deposition Al-Fe-V-Si alloy

Structures and Properties of Sc and Y Metals

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Journal of central south university 2000年第3期12卷 136-139页

作者： PENG Kun,XIE You qing,PENG Hao,XU Ying hong (Department of materials science and engineering, central south university, changsha 410083, china) 1. Department of materials science and engineering Central South University 410083 Changsha China

The electronic structures of pure Sc and Y metals with hcp structure have been determined by one atom (OA) theory, which are [Ar](3d c) 1.331 5 (4s c) 0.905 0 (4s f) 0.763 5 and [Kr](4d c) 1.293 0 (5s c) 0.947 0 (5s f) 0.760 0 . According to their electronic structure, their potential curves, cohesive energies, lattice constants, elasticity and the temperature dependence of linear thermal expansion coefficients have been calculated. The electronic structures and characteristic properties of these metals with bcc structures and primary liquids have also been studied, which has supplied the structural parameters and property parameters of Sc and Y with different crystal structures and also supplied a series of complete data for the theoretical design of Sc and Y based materials.

关键词： scandium yttrium electronic structure cohesive energy crystal structure