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

1989 Vol. 3, No. 4

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Exposure of Metastable Phases by High Pressure
WANG Wen-Kui
1989, 3(4): 257-268 . doi: 10.11858/gywlxb.1989.04.001
PDF (813)
Abstract:
It was proposed ninety years ago, that after condensation of vapor it is necessary for the condensation to pass through possible high temperature phases until the equilibrium phase is reached. However, it was in general impossible for metals and alloys to freeze a structure of liquid or metastable p...
High-Pressure Raman Spectra and Structure Phase Transition for Molecule Crystals
ZHAO Yong-Nian, ZOU Guang-Tian
1989, 3(4): 269-278 . doi: 10.11858/gywlxb.1989.04.002
PDF (669)
Abstract:
Pressure dependence on the intensities and frequency of Raman bonds, crystal field splitting and mode-Grneisen parameter were discussed. Raman data were taken from our experiments on NH3F, HCCl3, HCBr3, S8 and C3N6H6 et al. Raman spectroscopic evidence for pressure induced structure phase transition...
A Three Phase Equation of State for 2024Al
ZHANG Chun-Bin, LI Mao-Sheng, ZHANG Shi-Ze
1989, 3(4): 279-283 . doi: 10.11858/gywlxb.1989.04.003
PDF (828)
Abstract:
A three phase EOS for 2024Al is developed and the effect of the melting entropy on EOS is considered. The ratio of the gaseous temperature Tg to melting temperature Tom is determined from Clapeyron-Clausius equation. When densities less than the nomal density (0), we presented a new form for the col...
The Generation of 90 GPa Quasi-Hydrostatic Pressures and the Measurements of Pressure Distribution
LIU Zhen-Xian, CUI Qi-Liang, ZOU Guang-Tian
1989, 3(4): 284-289 . doi: 10.11858/gywlxb.1989.04.004
PDF (2030)
Abstract:
Quasi-hydrostatic pressures up to 90 GPa were obtained at room temperature in the diamond cell by using solid argon as pressure medium. The pressure distribution was determined by measuring the special shift of the R1 line of ruby at different positions within the sample chamber. Experimental result...
Experimental Study of the Effect of Shear Stress on Phase Transition in c-Axis CdS Single Crystal under Dynamic Loading
TANG Zhi-Ping, Gupta Y M
1989, 3(4): 290-297 . doi: 10.11858/gywlxb.1989.04.005
PDF (17287)
Abstract:
For a long time, the problem whether shear stress affects the phase transition initial pressure is not well solved. Duvall and Graham suggested that cadmium sulfide (CdS) crystal could be used to study the effect of shear stress on the initial pressure of phase transition in c-axis CdS single crysta...
Behavior of Two Oxide Superconductors under High Pressure
ZHANG Jin-Long, LIU Yong, CUI Chang-Geng, YANG Qian-Sheng
1989, 3(4): 298-301 . doi: 10.11858/gywlxb.1989.04.006
PDF (814)
Abstract:
The high-pressure observations at low, normal and high temperature have been performed on two single-phased superconducting oxides, NdBa2Cu3Ox and (Bi,Pb)2Sr2Ca2Cu3Oy, respectively. The superconducting transition temperatures were all raised with increasing pressure. It was noted that the normal sta...
Notes on the Relation between K1c and DF
DONG Lian-Ke, WANG Xiao-Wei
1989, 3(4): 302-307 . doi: 10.11858/gywlxb.1989.04.007
PDF (677)
Abstract:
In this paper, we analyze theoretically the quantitative relationship of contrary change between K1c and DF based on the different structure of plastic domain near a crack tip and the different mechanism of fracture. It suggests that the analysis and the calculation of dissipation energy play an imp...
Numerical Simulation of the Performance of Electromagnetic Railguns
ZHOU Zhi-Kui, CHEN Qiu-Hua
1989, 3(4): 308-314 . doi: 10.11858/gywlxb.1989.04.008
PDF (528)
Abstract:
A numerical calculation model simulating the main performance of electro-magnetic railguns is described in this paper. The model takes into account the increase in plasma armature masses due to the wall ablation and the drags caused by various effects such as the friction between projectile and wall...
Influence of the Vacuum Treatment on Wearing Capacity of Sintered Polycrystalline Diamond (PCD)
WANG De-Xin, JIAO Qing-Yu, WANG Fu-Quan, ZHENG Zhen-Kai
1989, 3(4): 315-320 . doi: 10.11858/gywlxb.1989.04.009
PDF (827)
Abstract:
The surface state of the diamond grains greatly affects the working capability of the PCD sintered under super pressure and high temperature. Usually the diamond grains are treated by vacuum or cation bombardment so that its surfaces are in a purer state than those sintered only under super pressure...

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