Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel

1994 Vol. 8, No. 2

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Ultrasonic Velocity and Attenuation Coefficient, Density and Adiabatic Compressibility of Petroleum Ether under High Hydrostatic Pressure
SU Fang, XIE Bin, WU Kun-Yu
1994, 8(2): 81-86 . doi: 10.11858/gywlxb.1994.02.001
PDF (842)
Abstract:
An apparatus for measuring ultrasonic velocity of liquid under different hydrostatic pressure was specially designed with the method of Pulse-Echo-overlap. Under the hydrostatic pressure ranged from 0.1 to 650 MPa, we measured ultrasonic velocity and attenuation coefficient of petroleum ether which ...
High Pressure Investigation of Fluorescence Spectra and Levels for Gd2O2S:Eu
CHI Yuan-Bin, WANG Li-Zhong, LIU Shen-Xin, WANG Qiu-Ping
1994, 8(2): 87-98 . doi: 10.11858/gywlxb.1994.02.002
PDF (690)
Abstract:
The fluorescence spectrum of Eu3+ doped in Gd2O2S has been investigated in the spectral region 21 500～11 500 cm-1 at 77 K and 300 K. The 122 spectral lines measured at 77 K and the 96 lines at 300K have been assigned. Thirty five of the thirty nine Stark levels of 5D0~2, 7F0~6 multiplets were identi...
Polycrystalline Jadeite Gem
CUI Shuo-Jing, ZHAO Ting-He, YAN Xue-Wei, MA Xian-Feng, ZHU Yi-Bing, CHEN Jiu-Hua, ZHAO Wei
1994, 8(2): 99-106 . doi: 10.11858/gywlxb.1994.02.003
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Abstract:
In this paper we concluded give a comprehensive review of the progress and experiment results in jadeite jewel synthesis. The syntheses were carried out on the 5MN diamond Beltpress and on the 68MN cubic anvil press. The working curves of pressure and temperature on the cubic anvil press with high p...
Formation of the Metastable Phases in Pd-18 at.% Si Alloy Solidified under High Pressure
QIN Zhi-Cheng, LIU Yong, HUANG Xin-Ming, WANG Wen-Kui
1994, 8(2): 107-112 . doi: 10.11858/gywlxb.1994.02.004
PDF (649)
Abstract:
The solidification characteristic of liquid Pd-18 at.% Si alloy under high pressure was investigated by using X-ray diffraction, DTA, TEM, SEM and X-ray energy spectrum. The mixture of MS-Ⅰ and MS-Ⅱ metastable phases was obtained during the solidification of the alloy under 5.5 GPa with a cooling ra...
Effect of Hydrogen on the Mechanical Behaviour of 22-13-5 Stainless Steel at Room Temperature
LONG Qi-Yi, FAN Cun-Gan, XING Zhong-Shu, LI Yi-Yi
1994, 8(2): 113-124 . doi: 10.11858/gywlxb.1994.02.005
PDF (777)
Abstract:
A stable fcc 22-13-5 stainless steel was hydrogen charged by exposing it in 9.8 MPa hydrogen gas at 300 ℃ for 14 days. The concentration of hydrogen was determined tobe 651 ppm. The mechanical testing at room temperature shows that after hydrogen charging the yield strength of the steel increases an...
The Pressure and Temperature Dependence of Thermal Conductivity for Nonmetal Crystals
TANG Wen-Hui
1994, 8(2): 125-132 . doi: 10.11858/gywlxb.1994.02.006
PDF (594)
Abstract:
The pressure (p) and temperature (T) dependences of thermal conductivity (k) for nonmetal crystals are discussed. The equations KT=A+Bp at low pressures and kp＝A1+B1/T at low temperatures that fitted from experimental data are developed in theory, where A, B, A1 and B1 are fitting constants and the ...
The Numerical Simulation of Reflectivity of Aluminum Alloy Irradiated by Laser Beam
YANG Li-Bing, ZHANG Guan-Ren, LUO Fu, LIU Xu-Fa
1994, 8(2): 133-140 . doi: 10.11858/gywlxb.1994.02.007
PDF (737)
Abstract:
Based on the free electron model－the Drude/Fresnel theory, the variation of reflectivity of the aluminium surface under intense laser interaction is analyzed in this paper. From the numerical simulation of the relation of the aluminium conductivity with temperature, the instantaneous variations of t...
The Formation of Decagonal Quasicrystal and a New Crystalline Approximant in Al70Co15Tb5Ni10 Alloy
YU Ri-Cheng, XU Da-Peng, SU Wen-Hui, PANG Yan-Xin
1994, 8(2): 141-145 . doi: 10.11858/gywlxb.1994.02.008
PDF (617)
Abstract:
In this paper, samples of Al70Co15Tb5Ni10 in fusion state (1 450 ℃) were quenched with a cooling rate of 102 ℃/s under high static pressure (4.40 GPa). Decagonal quasicrystal and a new crystalline approximant were found in the samples for the first time. The structures of the decagonal quasicrystal ...
Transportation of Carbon in High Pressure Flux and Its Effect on Diamond Growth
DING Li-Ye, LUO Xiang-Jie, Masao Wakatsuki, Yasushi Gohda, LI Wei
1994, 8(2): 146-152 . doi: 10.11858/gywlxb.1994.02.009
PDF (631)
Abstract:
Carbon supply is an important factor for nucleation and growth in diamond synthesis at high pressure and high temperature. It has been proved experimentally that carbon atoms of the source were dissolved in the flux and then transported towards the growing crystal mainly by diffusion in growing proc...
A Study on the Kinetic Process of the Reverse-Transition of in Fe2SiO4 by Using Synchrotron Radiation and HT-DAC
WANG Li-Jun, Ming L C, Manghnani M H, Balogh J
1994, 8(2): 153-160 . doi: 10.11858/gywlxb.1994.02.010
PDF (684)
Abstract:
The method of studying the kinetic process of phase transition by means of in situ high pressure and high temperature X-ray diffraction with synchrotron radiation and high temporature DAC apparatus has been described. The results of the study on Fe2SiO4 reverse transformation from phase to phase und...

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