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journal of Materials Science & Technology 2013年第2期29卷 161-167页

作者： K.A. Ofei L. zhao j. Sietsma Materials Innovation Institute M2i Mekelweg 2 2628 CD Delft The Netherlands Department of Materials Science and Engineering Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands

The magnetic response, microstructural and texture changes occurring during cold rolling of a Fe-14Mn-0.64c-2.4AI-0.25Si medium stacking fault energy TWlP （twinning induced plasticity） steel have been studied by X-ray diffraction and magnetic techniques. The changes in the sub-grain size （Ds）, probability of stacking fault formation （Psf） and microstrain in the material as cold rolling progressed were determined by using a modified version of the Williamson and Hall equation. A strong development of the crystallographic texture with increasing deformation was observed. Deformation-induced formation of a small fraction α＇-martensite was observed, indicating that the steel also exhibits γ→α＇-martensite transformation during cold rolling, which is discussed via the changes of the stacking-fault probability and the texture development during cold rolling.

关键词： TWIP steel α'-Martensite Sub-grain size Probability of stacking fault formation Texture development

Magnetic Properties and coercivity of MnGa Films Deposited on Different Substrates

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journal of Materials Science & Technology 2017年第3期33卷 291-294页

作者： j.N.Feng W.Liu W.j.Gong X.G.zhao D.Kim c.j.choi Z.D.Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Powder and ceramics Division Korea Institute of Materials Science

MnGa films were grown by magnetron sputtering on thermally oxidized Si（Si/SiO2） and glass substrates. Films grown on single-crystal Si（100） substrate with different underlayers were prepared for comparison. It is found that the Si/SiO2 substrate is more suitable for growing high-coercivity MnGa films than the glass substrate, which is the result of the isolated-island-like growth. A coercivity of 9.7 kOe can be achieved for the 10 nm MnGa films grown on Si/SiO2 substrate at substrate temperature TS of 450 °*** experimental conditions are specified by changing the thickness of the MnGa films and the temperature of the substrates.

关键词： Atomic force microscopy coercivity Magnetic properties Magnetron sputtering Thin film

Reversal of radial glow distribution in helicon plasma induced by reversed magnetic field

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Plasma Science and Technology 2017年第2期19卷 15-19页

作者： Y WANG G zhao c NIU Z W LIU j T OUYANG Q cHEN School of Physics Beijing institute of technology Beijing 100081 People＇s Republic of China Laboratory of Plasma Physics ＆ Materials Beijing Institute of Graphic Communication Beijing 102600 People＇s Republic of China

In this work, the reversal of radial glow distribution induced by reversed magnetic field is reported. Based on the Boswell antenna which is symmetric and insensitive to the magnetic field direction, it seems such a phenomenon in theory appears impossible. However, according to the diagnostic of the helicon waves by magnetic probe, it is found that the direction of magnetic field significantly affects the propagation characteristic of helicon waves, i.e., the interchange of the helicon waves at the upper and the lower half of tube was caused by reversing the direction of magnetic field. It is suggested that the variation of helicon wave against the direction of magnetic field causes the reversed radial glow distribution. The appearance of the traveling wave does not only improve the discharge strength, but also determines the transition of the discharge mode.

关键词： helicon plasma reversal of radial glow distribution the direction of magnetic field

Y_2O_3液相掺杂ZrO_2粉体的制备及其特性

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硅酸盐学报 2001年第5期29卷 488-491页

作者：袁正希 vleugels j Van Der Biest O 电子科技大学信息材料工程学院成都610054 DepartmentofMetallurgyandMaterialsEngineering

用一种新的液相掺杂技术制备Y2 O3 掺杂的ZrO2 纳米粉体 .在水 -乙醇溶剂中 ,干燥由硝酸铝、硝酸钇和单斜相氧化锆粉体组成的悬浮液 ,然后在 6 0 0℃热分解 ,可以制备出粒度小于 10 0nm的Y2 O3 掺杂单斜相ZrO2 粉体 .这种粉体可以在 0 .... 详细信息

用一种新的液相掺杂技术制备Y2 O3 掺杂的ZrO2 纳米粉体 .在水 -乙醇溶剂中 ,干燥由硝酸铝、硝酸钇和单斜相氧化锆粉体组成的悬浮液 ,然后在 6 0 0℃热分解 ,可以制备出粒度小于 10 0nm的Y2 O3 掺杂单斜相ZrO2 粉体 .这种粉体可以在 0 .1Pa的真空中 ,经 14 5 0℃热压烧结成致密化Y -TZP材料 .此材料的断裂韧性 (KⅠc)为 9.9MPa·m1 /2 ,Vickers硬度 (HV1 0 0N)为 11.72

关键词：制备氧化钇液相掺杂粉体钇稳定四方相多晶陶瓷力学性能二氧化锆 Y-TZP陶瓷原料

Effect of trace Ni addition on microstructure,mechanical and corrosion properties of the extruded Mg-Gd-Y-Zr-Ni alloys for dissoluble fracturing tools

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journal of Magnesium and Alloys 2021年第5期9卷 1649-1660页

作者： j.Wang T.Li H.X.Li Y.Z.Ma K.N.zhao c.L.Yang j.S.Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Petroleum Equipment of RIPED PetroChinaBeijing 100083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

Magnesium alloys,a novel functional material for the fabrication of fracturing tools,are being paid more and more attentions recently due to their relatively high mechanical properties and fast dissolubility ability after *** this study,the novel extruded Mg-10Gd-3Y-0.3Zr-xNi alloys will be reported and their microstructure,mechanical and corrosion behaviors will be also *** results show that Ni contents influence phase precipitation *** adding 0.2 wt%Ni,a large amount of Zr_(7)Ni_(10)phases will be precipitated insidesα-Mg matrix,directly leading to degradation of strength and large corrosion *** further increasing Ni contents,the precipitation phases can be changed from Mg_(5)RE to 18R-LPSO structure,resulting in higher mechanical properties and faster corrosion ***,adding Ni element also change the texture orientation by influencing the precipitation behavior of the *** alloys invented in this paper have attained the highest compressive and tensile properties among all the reported dissoluble magnesium *** work is beneficial in understanding the role of Ni in the magnesium alloys and provides more materials alternatives for the fabrication of dissoluble fracturing tools.

关键词： Dissoluble magnesium alloys Microstructure Mechanical properties corrosion behaviors Fracturing tools

A new thermodynamically stable Nb_(2)Ni intermetallic compound phase revealed by peritectoid transition within binary Nb-Ni alloy system

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journal of Materials Science & Technology 2022年第5期100卷 246-253页

作者： j.F.zhao H.P.Wang B.Wei School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710072China

A new intermetallic compound of thermodynamically stable Nb_(2)Ni phase is discovered within Nb-Ni binary system,refreshing the current situation that there are only three stable intermediate phases of Nb_(7)Ni_(6),NbNi_(3) and NbNi_(8).The new stable phase is generated from the peritectoid transition:(Nb)+Nb_(7)Ni_(6)→Nb_(2)Ni,and the transformation temperature is 1533 *** refreshes the current equilibrium Nb-Ni binary phase *** is confirmed by transmission electron microscopy and the annealing experiments,which is determined to be the Fcc structure(Pearson:cF96,space grope:Fd-3m O2,a=11.888A).Furthermore,the equilibrium properties of Nb_(2)Ni phase are produced by density functional theory,including the formation energy,cohesive energy,bulk modulus and lattice constant.

关键词： Intermetallic compound Peritectoid transition Transmission electron microscopy Density functional theory Nb alloy

Two Divergent Members of 4-coumarate： coenzyme A Ligase from Salvia miltiorrhiza Bunge： cDNA cloning and Functional Study

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journal of Integrative Plant Biology 2006年第11期48卷 1355-1364页

作者： Shu-juan zhao Zhi-Bi Hu DI Liu Frederick c. c. Leungt Institute of Traditional chinese Materia Medica Shanghai University of Traditional Chinese Medicine Shanghai 201203 China Department of Zoology University of Hong Kong Hong Kong SAR China

4-coumarate ： coenzyme A Ilgase （4cL） Is one of the key enzymes In phenylpropanoid metabolism leading to series of phenollcs, Including water-soluble phenolic acids, which are important compounds determining the medicinal quality of Danshen （Salvia miltiorrhiza Bunge）, a traditional chinese medicinal herb. To Investigate the function of 4cL in the biosynthesis of water-soluble phenolic acid in Danshen, we have cloned two cDNAs （Sm4cL1 and Sm4cL2） encoding divergent 4cL members by applying nested reverse transcrlptlon-polymerase chain reaction （RT-PcR） with degenerate primers followed by 5′/3′rapid amplification of cDNA ends （RAcE）（Note, these sequence data have been submitted to the GenBank database under accession numbers AY237163 and AY237164）. Either of the coding regions was inserted into a pRSET vector and a kinetic assay was performed with purified recombinant proteins. The substrate utilization profile of Sm4cL1 was distinct from that of Sm4cL2. The Km values of Sm4cL1 and Sm4cL2 to 4-coumarlc acid were （72.20±4.10） and （6.50±1.45） μmol/L, respectively. These results, In conjunction with Northern blotting and other information, imply that Sm4cL2 may play an Important role in the biosynthesis of watersoluble phenolic compounds, whereas Sm4cL1 may play a minor role in the pathway. Southern blotting analysis suggested that both Sm4cL1 and Sm4cL2 genes are present as a single copy and are located at different sites In the genome.

关键词： cDNA cloning 4-coumarate : coenzyme A ligase (4cL) Danshen (Salvia miltiorrhiza) enzymatic kinetic assays water-soluble phenolic acids.

Low-cost and efficient Mn/ceO_(2) catalyst for photocatalytic VOcs degradation via scalable colloidal solution combustion synthesis method

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journal of Materials Science & Technology 2022年第21期116卷 169-179页

作者： Yingguang Zhang Muyan Wu Yifei Wang Xiaolong zhao Dennis Y.c.Leung Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518000China

colloidal solution combustion synthesis(cScS)is a simple and easy method for mass-production of crystalline nanomaterials with tunable pore *** this work,mesoporous Mn/ceO_(2) catalysts were fabricated via cScS method coupled with a dip-coating process and used for photocatalytic oxidation(PcO)of *** vacuum ultraviolet(VUV)irradiation,a high toluene removal efficiency of about 92%was achieved with a toluene reaction rate of about 118μmol/g/h in a continuous flow reactor.A possible degradation pathway was proposed based on the analysis of intermediates by Fourier transform infrared photoluminescence spectra(FTIR)and *** temperature-programmed reduction(H_(2)-TPR),Brunauer-Emmett-Teller(BET)surface areas,photoluminescence spectra(PL)spectra and X-ray photoelectron spectroscopy(XPS)were carried out to analyze physical and chemical properties of the *** with Mn_(x)ce_(1-x)O_(2) catalysts synthesized by one step cScS method,Mn/ceO_(2) has a higher photocatalytic activity,which is attributed to the presence of higher contents of ce^(3+),Mn^(2+)and Mn^(3+)*** presence of higher contents of these species plays a key role in the activity enhancement of toluene oxidation and ozone *** method is facile,efficient and scalable,and it may become a promising industrial application technology for catalyst synthesis in the near future.

关键词： Mesoporous ceO_(2) Manganese modification Scalable synthesis Photocatalysis VOcs abatement

THERMAL STRUcTURAL DISORDER AND MELTING TRANSITION IN HIGH-ANGLE GRAIN-BOUNDARY: A MOLEcULAR-DYNAMIcS STUDY

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Acta Metallurgica Sinica(English Letters) 1998年第5期11卷 365-375页

作者： S.j.zhao Y.c.Wang j.Q.You Q.B.Yang L.G.Zhou H.Q.Ye Xiangtan Univ Xiangtan China

A structural transition in the fcc ∑=5 (120)/[001] high-angle tilt grain-boundary(GB)is investigated by molecular-dynamics simulation. The calculations have been performed at various temperutures and the thermodynamic melting point Tm of the model system is determined by using a many-body potential fitted to copper. A thermal disorder transition in the GB region occurs well below the melting point. Our results indicate that such a transition is a continuous process and there is no evidence of premelting, which is entirely in accord with experiment results and theoretical *** we also observed that melting initiated at the interface and then propagated into the bulk quickly at or above Tm.

关键词： moleculandynamics grainboundary structural transition

Recent Achievements in Developing Low Temperature and High Strain Rate Superplastic Materials

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journal of Materials Science & Technology 2001年第1期17卷 19-20页

作者： j.c Huang Inst.Materials Science and Engineering Sun Yat-Son UniversityKaohsiungTaiwan 804China

This paper is to briefly outline our recent activities in developing low temperature or high strain rate superplastic materials, including aircraft-used and general-purpose Al- and Mg-base alloys or composites. as well as Ti3AI base intermetallic alloys. The processing routes applied included the thermomechanical treatment, equal channel angular pressing and other extrusion or forging methods.

关键词： High Strain Rate thermomechanical treatment intermetallic alloys processing routes high strain rate low temperature