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| 1 | Microstructure and tensile behavior of hot extruded AZ91 alloys at room temperature显示文摘AZ91 alloys were prepared by hot extrusion and its microstructure and tensile behavior at room temperature were investigated. Compared to as-cast ingot, the grain size of hot-extruded material is morerefined, the intermetallic phase Mg17Al12 is broken and dispersed discontinuously. Both strength and elongation of AZ91 are improved by hotextrusion. Tensile behavior and fracture surface of the experimental material were studied. Due to the change in microstructure, the fracture mechanism of extruded material is different from that of as-cast ingot, the latter is mainly a brittle fracture. Ductile fracture plays arole in hot-extruded AZ91 failure at room temperature. | Yuanyuan Li, Datong Zhang, Ying Liu, Yan Long, and Weiping ChenCollege of Mechanical Engineering, South China University of Technology Guangzhou 510640, China | 2002 | Journal of University of Science and Technology Beijing2002，9，5： | 10 |
| 2 | Research progress on squeeze casting in China显示文摘Squeeze casting is a technology with short route,high efficiency and precise forming,possessing features of casting and plastic processing.It is widely used to produce high performance metallic structural parts.As energy conservation and environmental protection concerns have risen,lightweight and high performance metal parts are urgently needed,which accelerated the development of squeeze casting technology over the past two decades in China.In this paper,research progress on squeeze casting alloys,typical parts manufacturing and development of squeeze casting equipment in China are introduced.The future trend and development priorities of squeeze casting are discussed. | Li Yuanyuan Zhang Weiwen Zhao Haidong You Dongdong Zhang Datong Shao Ming Zhang Wen | 2014 | China Foundry2014，11，4： | 8 |
| 3 | An integrated turbocharger design approach to improve engine performance显示文摘Turbocharging technology is today considered as a promising way for internal combustion engine energy saving and CO2 reduction.Turbocharger design is a major challenge for turbocharged engine performance improvement.The turbocharger designer must draw upon the information of engine operation conditions,and an appropriate link between the engine requirements and design features must be carefully developed to generate the most suitable design recommendation.The objective of this research is to develop a turbocharger design approach for better turbocharger matching to an internal combustion engine.The development of the approach is based on the concept of turbocharger design and interaction links between engine cycle requirements and design parameter values.A turbocharger through flow model is then used to generate the design alternatives.This integrated method has been applied with success to a gasoline engine turbocharger assembly. | ZHANG YangJun1,CHEN Tao1,ZHUGE WeiLin1,ZHANG ShuYong2 & XU JianZhong3 1 State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China 2 National Key Laboratory of Diesel Engine Turbocharging Technology,P.O.B.22,Datong 037036,China 3 Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China | 2010 | Science China(Technological Sciences)2010，53，1： | 8 |
| 4 | Microstructures and tensile properties of submerged friction stir processed AZ91 magnesium alloy显示文摘6 mm thick AZ91 casting alloy plates were subjected to normal friction stir processing(NFSP,in air)and submerged friction stir processing(SFSP,under water),and microstructures and tensile properties of the experimental materials were investigated.After FSP,the coarse microstructures in the as-cast condition are replaced by fine and equiaxed grains and the network-like eutecticβ-Mg_(17)Al_(12)phases disappear and are changed into particles pinned at the grain boundaries.SFSP results in further grain refinement in comparison with NFSP,and the average grain sizes of the NFSP and SFSP alloys are 8.4±1.3 and 2.8±0.8µm,respectively.XRD results reveal that the intensity ofβ-Mg_(17)Al_(12)diffraction peaks in the SFSP specimen decreases compared with NFSP.Due to significant grain refinement,the tensile strength and elongation of the SFSP AZ91 alloy are increased from 262 MPa and 18.9%for the NFSP material to 282 MPa and 25.4%,and the tensile strength(282 MPa)is nearly three times that of the BM(105 MPa).SFSP is an effective approach to refine the grain size and enhance the tensile properties of AZ91 casting alloy. | Fang Chai Datong Zhang Yuanyuan Li | 2015 | Journal of Magnesium and Alloys2015，3，3： | 7 |
| 5 | Radiation spectrum of a high-dimensional rotating black hole显示文摘This study extends the classical Damour-Ruffini method and discusses Hawking radiation in a (n + 4)-dimensional rotating black hole. Under the condition that the total energy and angular momentum of spacetime are conservative, but angular momentum a = J/M of unit mass of the black hole is variable, taking into consideration the reaction of the radiation of the particle to the spacetime, a new Tortoise coordinate transformation and discuss the black hole radiation spectrum is discussed. The radiation spectrum that satisfies the unitary principle in the general case is derived. | ZHAO Ren, LI HuaiFan, ZHANG LiChun & WU YueQin Institute of Theoretical Physics, Shanxi Datong University Department of Physics, Shanxi Datong University, Datong 037009, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，3： | 6 |
| 6 | Effect of microstructure on the mechanical and corrosion behaviors of a hot-extruded nickel aluminum bronze显示文摘In this paper,the influence of microstructure on the corrosion behavior of a hotextruded nickel aluminum bronze was studied.Three kinds of samples subjected to the hot-extrusion,annealing and quenching conditions were prepared and immersion tests in 3.5% NaCl solution were carried out.Microstructures and corrosion surface morphologies of the samples were observed by SEM.It was found that the retained β martensite and(α+κⅢ) lamella eutectoid in the as hot-extruded material were eliminated after annealing,and corrosion resistance of the alloy was improved.As to the as-quenched material,its corrosion rate was higher than that of the as hotextruded material since the volume fraction of β phase which was anodic to α phase increased after quenching.As regards the mechanical properties,the as-quenched sample possesses the highest hardness and tensile strength among the three kinds of samples,while the as-annealed sample possesses the highest elongation.That is to say,heat treatment plays different roles in the mechanical properties and corrosion resistance of the experimental alloy. | Datong ZHANG Ruiping CHEN Weiwen ZHANG Zongqiang LUO Yuanyuan LI | 2010 | Acta Metallurgica Sinica(English Letters)2010，23，2： | 5 |
| 7 | Tests for nonparametric parts on partially linear single index models显示文摘Tests for nonparametric parts on partially linear single index models are considered in this paper. Based on the estimates obtained by the local linear method, the generalized likelihood ratio tests for the models are established. Under the null hypotheses the normalized tests follow asymptotically the χ2-distribution with the scale constants and the degrees of freedom being independent of the nuisance parameters, which is called the Wilks phenomenon. A simulated example is used to evaluate the performances of the testing procedures empirically. | Ri-quan ZHANG Department of Statistics, East China Normal University, Shanghai 200062, China Department of Mathematics, Shanxi Datong University, Datong 037009, China | 2007 | Science China Mathematics2007，50，3： | 5 |
| 8 | Photochemical properties and source of pollutants during continuous pollution episodes in Beijing, October, 2011显示文摘Beijing sufered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of watersoluble ions in PM2.5during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO4 2, NO3 and NH4 +in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles(0.2–2 μm) and water-soluble K+in PM2.5also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes. | Jian Gao Yuechong Zhang Meng Zhang Jingqiao Zhang Shulan Wang Jun Tao Han Wang Datong Luo Fahe Chai Chun Ren | 2014 | Journal of Environmental Sciences2014，26，1： | 4 |
| 9 | Microstructures and mechanical properties of squeeze cast Al–5.0Cu–0.6Mn alloys with different Fe content显示文摘 | WeiWen Zhang Bo Lin DaTong Zhang YuanYuan Li | 2013 | Materials and Design2013，，： | 2 |
| 10 | Trans superplasticity of AZ31 magnesium alloy prepared by frictionstm proccssing显示文摘 | Zhang Datong Xiong Feng Zhang Weiwen | 2011 | Nonfer- rous Met Soc China2011，，21： | 1 |
| 11 | Superplastic tensile behavior of a finegrained AZ91 magnesium alloy prepared by fricti- on stir processing 显示文摘 | Zhang Datong Wang Saixiang Qiu Chen | 2012 | Mater Sci Eng A2012，，556： | 1 |
| 12 | Microstructure evolution of AZ31 magnesium alloy during equal channel angular extrusion 显示文摘 | Li Yuanyuan Zhang Datong Chen Weiping | 2004 | Journal of Materials Science2004，39，11： | 1 |
| 13 | Method to manu- facture plane-generated hourglass worm with high preci- seion based on coordinate measurements显示文摘 | Qing Datong Yan Jia Zhang Guanghui | 1997 | Chinese Journal of Mechanical Engineering1997，33，1： | 1 |
| 14 | Studyon dynamic characteristics of wind turbine planetarygear system coupled with bearing at varying wind speed显示文摘 | Zhang Zhengguo Qin Datong Yang Jun | 2011 | Applied Mechanics and Materials2011，86，8： | 1 |
| 15 | A luminescent metal-organic framework as a turn-on sensor for DMF vapor显示文摘 | Li Yu Zhang Shanshan Song Datong | 2013 | Angew Chem Int Ed Engl2013，52，2： | 1 |
| 16 | Microstructural evolution of a heat-resistant magnesium alloy due to friction stir welding显示文摘 | Zhang Datong Suzuki Mayumi Maruyama Kouichi | 2005 | Scripta Materialia2005，52，9： | 1 |
| 17 | A review of water flooding issues in the proton exchange membrane fuel cell显示文摘 | Hui Li Yanghua Tang Zhenwei Wang Zheng Shi Shaohong Wu Datong Song Jianlu Zhang Khalid Fatih Jiujun Zhang Haijiang Wang Zhongsheng Liu Rami Abouatallah Antonio Mazza | 2007 | Journal of Power Sources2007，，1： | 1 |
| 18 | The Study of Tooth Modification on Double Enveloping Worm Gearing with Developable Tooth Surface显示文摘 | Qin Datong Zhang Guanghui | 1993 | Chinese Journal of Mechanical Engineering:English Edition1993，6，2： | 1 |
| 19 | Influence of High-energy Ball Milling on Al-30wt% Si Pow- der and Ceramic Particulate 显示文摘 | Li Yuanyuan Zhang Datong Xiao Zhiyu | 2000 | Transactions of Nonferrous Metal Society of China2000，，3： | 1 |
| 20 | High strain rate superplasticity of a fine-grained AZ91 magnesium alloy prepared by submerged friction stir processing显示文摘 | Fang Chai Datong Zhang Yuanyuan Li Weiwen Zhang | 2013 | Materials Science & Engineering A2013，，： | 1 |
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