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PRODUCTION OF HIGHLY GRAPHITIZED MULTIWALlED CARBON ANOTUBES

X.L.Zhao1) , T.L.Guo2) , M.Ohkohchi3) , T.Okazaki3) , S.Iijima and Y.Ando3) 1) Japan Science and Technology Corporation , Department of Physics , Meijo University , Shiogamaguchi1 501 , Tempaku ku , Nagoya 468 8502 , Japan 2) Scientific Research Department , Shenyang University , Wanghuanan Street21 , Dadong District , Shenyang 110044 , China 3) Department of Physics , Meijo University , Shiogamaguchi 1 501 , Tempaku ku , Nagoya 468 8502 , Japan$

金属学报(英文版)

Multiwalled carbon nanotubes ( MWNTs) were prepared by DCarc dischargein hydrogen gas, and werethermally purified byinfrared radiation in air. The morphology of pristineand purified MWNTs was observed by scanning electron microscope ( SEM) , and the crys tallinestructureand perfection wereinvestigated by high resolution transmission electron mi croscope( HRTEM) and Raman spectrometer. Itcameto the conclusion thatthese MWNTs possessed a high degreeof graphitization and very narrow centralchannel(about1 0 nm indiameter) , giving risetotheappearanceof breathing modesfor MWNTs.

关键词: multiwalled carbon nanotubes , null , null , null , null

STRUCTURE AND MAGNETIC PROPERTIES OF Fe/Pd COMPOSITIONALLY MODULATED FILMS

ZHANG Lin , LIU Yihua Shandong University , Jinan , China WANG Hao Dongnan University , Nanjing , China engineer , Department of Physics , Shandong University , Jinan 250100 , China

金属学报(英文版)

Metal Fe/Pd compositionally modulated films(CMFs) were prepared by vapour depo- sition from two sources onto glass substrate under vacuum.The modulation and crystal structures of the films were examined by X-ray diffraction.The magnetic properties were determined by vibrating sample magnetometer.The Pd layers in the Fe/Pd CMFs are of fcc structure,and the Fe layer structure transits from bcc into amorphous,state with decreasing thickness of Fe layer.The dependence of specific saturation magnetization on thickness of Fe layers has also been discussed.

关键词: compositionally modulated films , null , null

DESIGN CONCEPT FOR SNAP-ACTING TWO-WAY SHAPE MEMORY DEVICES

LIN Guangming CHENXingyuan ZHANG Jinxiu Material Science Research Institute , Zhongshan University , Guangzhou , China WANG Yurui Metallurgy Research Institute of Beijing Iron and Steel Company , Beijing , China LIN Guangming Associate Professor , Department of Physics , Zhongshan University , Guangzhou 510275 , China

金属学报(英文版)

Snap-acting two way shape memory device can be obtained by using the design proposed by authors.Some essential parameters which characterize the properties of device have been pro- posed also in this paper.And the principle and method according to which a practical snap-acting device can be designed have been described.

关键词: shape memory alloy , null , null

IN SITU TEM OBSERVATION OF MICROSTRUCTURES OF AUSTENITIC-0.45%C STEELS WELD JOINT

PAN Chunxu SHI Yuxiang WANG Renhui GUI Jianian Wuhan University , Wuhan , China Wuhan University of Water Transportation Engineering , Wuhan , China Professor , Department of Physics , Wuhan University , Wuhan , China

金属学报(英文版)

The successive alteration o the microstructure from the weld metal zone through weld bond to the heat affected zone of a Cr18Ni13 austenitic-0.45%C steels weld joint was observed in situ using transmission electron microscopy.It was found a new type of microstructure called pearlite-like structure and observed the characteristics of the boundary of dissimilar phases. Based on the definition of various zones of the dissimilar steels weld joint under the optical mi- croscope,the transmission electron microscopic characteristics,including microstructures and compositions,of each zone are described and discussed.

关键词: weld joint microstructure , null , null

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