高压物理学报

Study on the Phenomena of the Mass Ejection from the Free Surface of Aluminum at Different Dynamic Loading Rates

HAN Chang-Sheng, JING Fu-Qian, DING Jing, ZHANG Wen-Ping, CHEN Sen-Hua, LU Jing-De

1989, 3(2): 97-106 . doi: 10.11858/gywlxb.1989.02.001

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Abstract:
The relation between the mass-ejection and the dynamic loading rate has been investigated with emphasis on the micro-jetting mechanism. Artificial wedged-grooves were made as the geometrical defects on the free surface, ramp-wave generator technique was employed to control the rate of dynamic loadin...

Direct Observation and Mechanism Study of the Dynamic Process of Thermal Expansion

TANG Da-Wei, ZHOU Ben-Lian, HE Guan-Hu

1989, 3(2): 107-114 . doi: 10.11858/gywlxb.1989.02.002

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Abstract:
In this work, CO2 laser pulse of 0.1 s was used to heat instantly the thin specimens of Al, constantan, BN with the thickness of 20~100 m, and a system of the slit diffraction using He-Ne laser was also adopted. By a photoelectric converting device, the change of the specimen length was transferred ...

The Planar Dynamic Compaction of Tungsten Powder

XUE Hong-Lu, LU Fang-Yun

1989, 3(2): 115-124 . doi: 10.11858/gywlxb.1989.02.003

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Abstract:
In this paper we study the planar dynamic compaction of tungsten powder with the granular size of 3 m and 20 m. It is shown experimentally that the tungsten powder with smaller granular size cannot be well compacted. Its compacted sample has severe layer division. In order to obtain well-compacted s...

The Surface Graphitization of Diamond Grains in the Process of Sintering Polycrystalline Diamond

ZHANG Xing-Dong, PENG Ying-Cong, QIU Shu-Zhen, LI Bo-Xun, ZUO Chang-Ming

1989, 3(2): 125-131 . doi: 10.11858/gywlxb.1989.02.004

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Abstract:
The surface graphitization of diamond grains, which is induced in the process sintering polycrystalline diamond under high pressure, is studied. The results of analysis by micro-area X-ray diffraction, XPS and laser Raman spectrum etc. show that no graphitization is detected in the area where the do...

Crystal structure Stability Study by Molecular Dynamics Method with Variable Cell

HU Xiao-Mian

1989, 3(2): 132-142 . doi: 10.11858/gywlxb.1989.02.005

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Abstract:
In this paper, the crystal structure stability of metals irradiated by ion beam is investigated by molecular dynamics method with variable cell. The phase transformation process of copper, aluminum and silver metals under pressure are simulated. It is confirmed that for Cu, Ag, Al at normal conditio...

Molecular Dynamics Studies of Material Behavior at High Strain Rates

YU Wan-Rui

1989, 3(2): 143-147 . doi: 10.11858/gywlxb.1989.02.006

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Abstract:
Molecular dynamics is used to investigate the mechanical behavior of crystal material at high strain rates in this paper. Dislocation and plastic deformation was produced in crystal material under shock loading. Phase change could occur when shock loading was strong. It was obtained that the yield s...

The Calculation of Thermal Expansion Coefficients of Several Alkali Halide Crystals

SUN Feng-Guo, LI Yong

1989, 3(2): 148-151 . doi: 10.11858/gywlxb.1989.02.007

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Abstract:
Using the method of P. Mohazzabi and F. Behrooz, we calculated thermal expansion coefficients of NaCl, KCl, RbBr and KBr at room temperature. The results are in agreement with experimental data approximately.

The Phase Transition of PSZT Ceramics under High Pressure

LI Feng-Ying, WANG Ru-Ju, GU Hui-Cheng, WANG Ji-Fang, ZHANG Liang-Kun, CHEN Zhi-Ming, LIAN Jing-Yu, QU Cui-Feng

1989, 3(2): 152-155 . doi: 10.11858/gywlxb.1989.02.008

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Abstract:
The phase transition of PSZT ceramics with vertical ferro-antiferroelectric phase boundary was studied by using ultra sonic pulse echo overlap method under high pressure. It was found that there was a first-order transition caused by pressure in those samples, and the phase transition was reversible...

Studies of Phase Transition in LADTGS Crystal with Ultrasonic Method

WANG Ru-Ju, LI Feng-Ying, YAO Yu-Shu, WANG Ji-Fang, LIN Xue-Shi

1989, 3(2): 156-158 . doi: 10.11858/gywlxb.1989.02.009

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Abstract:
The variation of the velocity and attenuation coefficient of ultrasonic wave with temperature in LADTGS crystal in the range from 20 ℃ to 90 ℃ under hydrostatic pressure up to 0.8 GPa has been investigated by means of ultrasonic pulse echo overlap techniques. The slope of the curve of the velocity v...

Measurement of High Pressure at the Temperature of 600 to 760 ℃ by Melting Point of Plumbum

HONG Shi-Ming, LUO Xiang-Jie, WANG Yong-Guo, SUN Zhu-Mei, JIANG Ren-Zhu

1989, 3(2): 159-164 . doi: 10.11858/gywlxb.1989.02.010

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Abstract:
Melting points of Pb under high pressure were measured with the NiCr-NiSi thermocouple, using the cubic anvil type high pressure apparatus, so that the relation between pressure in cell and oil pressure was obtained according to the melting curve of Pb in the range from 600 to 760 ℃ for two assembli...

Studies of Crystallization of High Density Polyethylene under High Hydrostatic Pressure

WU Rui-Qi, WANG Hui, YANG Guang-Qun, HUANG Rui

1989, 3(2): 165-171 . doi: 10.11858/gywlxb.1989.02.011

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Abstract:
High density polyethylene has been crystallized under a pressure 1 GPa to 2 GPa and cooled at 5 ℃ per minute from the melting point. The solids were analyzed at atmosphere pressure by DSC, SEM and WAXD. The data show that the crystalline content of the samples by WAXD increases to 89.9% from 68.2% o...

Second and Third Order Elastic Constants of Titanium Alloy TC-6

ZHANG Shu-Hua

1989, 3(2): 172-175 . doi: 10.11858/gywlxb.1989.02.012

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Abstract:
The second and third order elastic constants of titanium alloy (TC-6) had been measured using ultrasonic pulse echo overlap technique. Pressure derivative of shear modulus is found to be negative in the range p0.17 GPa and positive in the range p0.17 GPa.

1989 Vol. 3, No. 2

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