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Brass H62 Hot Extrusion of Micro Gear Xiangru LIU 1, a, Xudong ZHOU 2,b 1Physics College& Engineering College, Henan University of Science & Technology, Luo Yang, 471003, China 2Material Science & Engineering College, Henan University of Science & Technology, Luo Yang, 471003, China a xiangruliu314@126.com, b syuuzhou@163.com Keywords: hot extrusion, micro-gear, microstructure, brass Abstract.
The first extruded micro-gear, that modulus m = 10μm, number of teeth z = 10 micro-gear, was carried out by SAOTOME and IWAZAKI of Japan GUMA University using Al78-Zn superplastic materials in 2001[1-2].
Micro gear extrusion In this study brass H62 was selected as the extrusion blank material, which chemical composition was shown in Table 1.
Journal of Materials Processing Technology.

Introduction TiAl-based intermetallics have received considerable interest as potential high-temperature structural materials for aerospace, automotive and other applications, due to their high specific strength, excellent oxidation and corrosion resistance, relatively low densities, and adequate creep resistance at high temperatures [1-4].
Experimental For the synthesis of Al2O3/TiAl in situ composites, powders of Ti (280 mesh, 99.3% purity), Al (200 mesh, 99.5% purity), TiO2 (0.5 μm, 99% purity), and Cr2O3 (320 mesh, 99% purity) were used as raw materials.
The measurement of the fracture toughness by a single-edge notched beam method was conducted with a universal material testing machine (PT-1036PC, Perfect Instrument Co.
Acknowledgements This work was supported by the National Foundation of Natural Science, China (51072109), Foundation of Xianyang, China (XK06010-11), and the Graduate Innovation Fund of Shaanxi University of Science and Technology.
Ai: Chinese Journal of Aeronautics Vol. 21 (2008), p. 559 [14] A.F.

Study on Static Shear-rheologic Characteristics of Semi-solid AZ91D Magnesium Alloy by Reheating Ji Zesheng 1,a , Hu Maoliang1,b and Zheng Xiaoping1,c 1 College of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China a jizes@sohu.com, bhumaoliang2008@sina.com.cn, czhengxiaoping@sohu.com Keywords: AZ91D magnesium alloy, semi-solid, static shear, rheologic characteristics Abstract: Static shear-rheology for self-made semi-solid AZ91D magnesium alloy slurry was studied by using the tester and a universal electronic machine.
Czerwinski: Materials Science and Engineering A Vol. 367 (2004), p.261 [4] D.N.
Wu, et al: Materials Processing Technology Vol. 129 (2002), P.431 [5] Z.S.
Liu, et al: The Chinese Journal of Nonferrous Metals Vol. 13 (2003), p.1156 [6] S.

HRTEM OBSERVATION OF PRECIPITATES AT EARLY STAGE OF AGING IN Mg-Gd-Zr ALLOY Tokimasa Kawabata1, a , Toshiyuki Matsuno 1,a, Kenji Matsuda 1,b , Shigeharu Kamado 2,c , Yo Kojima 2,d and Susumu Ikeno1,e 1 Graduate school of science and engineering for research, University of Toyama, 3190, Gofuku, Toyama, 930-8555, Japan, 2 Nagaoka University of Technology,1603-1, Kamitomioka, Nagaokashi, Niigata, 940-2188, Japan a kawabata@eng.u-toyama.ac.jp, bmatsuda@eng.u-toyama.ac.jp, ckamado@mech.nagaokaut.ac.jp, d kojima@jcom.nagaokaut.ac.jp, eikeno@eng.u-toyama.ac.jp Keywords: high resolution transmission electron microscope, Mg alloy, precipitates, aging Abstract.
Nie, Materials Science and Engineering A, 431 (2006) 162-167
Ikeno, Materials Transactions, (2006), .954-959
Ding, Journal of Alloys and Compounds, 421 (2006) 309-313
Honma et al, Material Science and Engineering A, 395 (2005) 301-306

Materials and Methods A.
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Due to the continuous development of urban construction and ever-enlarging lighting coverage, the traditional lighting management methods can not realize centralized monitoring, have poor real-time performance and cost lots of human and material resources; thus, can not satisfy the requirements of energy saving and efficiency improvement[1].
The Design of Intelligent Street Lamps' Monitoring Website Based on GIS [J].China Illuminating Engineering Journal, 2007, 18(4):70~74
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Consequently polymers/nanoparticle composite is superior to the same component of conventional materials.
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Acknowledgments This project was supported by the State Major Science and Technology Special Project (No. 2009ZX04012-31) References [1] Dewes R.C. and Aspinwall D.K.
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Acknowledgement It is a project supported by the National Natural Science Foundation of China (51078248).
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