高压物理学报

LI Yong-Chi, GUO Yang, TAN Fu-Li, ZHU Lin-Fa

2003, 17(2): 81-87 . doi: 10.11858/gywlxb.2003.02.001

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Abstract:
The most materials have the positive strain-rate sensitivity, the yield stresses of which will increase with the strain-rate increasement. However, based on the dynamic experiments we found that the Al-Li alloy has the negative strain-rate sensitivity and the impact ductility. In this paper, by mean...

Pressure and Temperature Effects on the System of Lithium Doped in Solid D2

MA Yan-Ming, CUI Tian, HE Wen-Jiong, ZHOU Qiang, LIU Zhi-Ming, ZOU Guang-Tian

2003, 17(2): 88-94 . doi: 10.11858/gywlxb.2003.02.002

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Abstract:
We employ quantum path-integral Monte Carlo method to investigate the pressure and temperature effects on the system of Li in solid D2. Our results show that under high pressure (0.9~2.4 GPa), when the lithium atom doped into solid D2, it will occupy five-vacancy trapping site. Application of temper...

Correction of Temperature Gradient in Sample Cell of Pulse Transmission Experimental Setup on Multi-Anvil High Pressure Apparatus

LIU Wei, DU Jian-Guo, YU Yong, BAI Li-Ping, WANG Chuan-Yuan

2003, 17(2): 95-100 . doi: 10.11858/gywlxb.2003.02.003

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Abstract:
There is a remarkable temperature gradient in the sample cell in the pulse transmission experimental setup on a multi-anvil high pressure apparatus. The elastic wave velocity was corrected by combination of experiment, theory analysis, and computation in terms of the experimental data on temperature...

Effect of Pressure on Carbon Concentration in C-H-O Supercritical-Fluid

ZHAO Xian-Feng, HONG Shi-Ming, LIU Fu-Sheng

2003, 17(2): 101-105 . doi: 10.11858/gywlxb.2003.02.004

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Abstract:
By statistical thermodynamics methods and CHEQ code, the concentrations of carbon in the system of graphite-water were calculated at 5.5~7.7 GPa and 1 000~2 900 K. Relation between the concentration of carbon in water and the pressure was mainly studied. Results could be summarised as follows: (1) A...

Analysis of Reaction Products of Micro-Crystal Mixture of Graphite Hexagonal Boron Nitride with Water under the High-Temperature and High-Pressure

LUO Xiang-Jie, PENG Fang, CHEN Hao, BI Yan, LUO Bo-Cheng, DING Li-Ye

2003, 17(2): 106-110 . doi: 10.11858/gywlxb.2003.02.005

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Abstract:
In this paper, the possibility of synthesizing the boron-carbon-nitride (B-C-N) compound by water catalyst has been investigated. The micro-crystal mixture of graphite and hexagonal boron nitride (hBN) was obtained by ball-milling. Under the temperature of 800~1 500 ℃ and the pressure of 6.1 GPa, th...

Formation of Functionally Graded Material during the Propagation of Phase Boundary under Shock Loading

DAI Xiang-Yu, TANG Zhi-Ping

2003, 17(2): 111-116 . doi: 10.11858/gywlxb.2003.02.006

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Abstract:
The propagation of shock-induced phase boundary in a material undergoing irreversible phase transition was studied theoretically using a model based on simple-mixture rule. It was found that along with the decay of the phase boundary, the functionally graded material (FGM) formed in the mixed-phase ...

Shock Wave Induced by High-Energy Proton Beams

WANG Tong-Quan, ZHANG Ruo-Qi, TANG Wen-Hui, XIAO Ya-Bin

2003, 17(2): 117-121 . doi: 10.11858/gywlxb.2003.02.007

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Abstract:
The numerical simulation of the shock wave induced by intense proton beams were presented in this paper, the energy deposition process of the intense proton beams in Al were simulated by Monte Carlo method, and the coupled mechanical process induced by the energy deposition were simulated by use of ...

Effect of High Hydrostatic Pressure Treatment on Physiological Characteristics of Rice Plants (Oryza sativa L.)

LI Gui-Shuang, BAI Cheng-Ke, DUAN Jun, PENG Chang-Lian, WENG Ke-Nan, LIU Shu-Dong

2003, 17(2): 122-128 . doi: 10.11858/gywlxb.2003.02.008

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Abstract:
Seeds of two rice (Oryza sativa L.) cultivars, Yuexiangzhan and Yuefengzhan, were soaked for 10 h, and then were treated by 75 MPa high hydrostatic pressure for 12 h. Germination rates decreased to 85.6% (Yuexiangzhan) and 83.4% (Yuefengzhan) relative to the untreated, and seedling rates were only 2...

Shear Fractures of LY12 Aluminum Cylinder under High-Strain-Rate Implosive Loading

TANG Tie-Gang, HU Hai-Bo, LI Qing-Zhong, GU Yan, ZHANG Chong-Yu, WANG De-Sheng

2003, 17(2): 129-134 . doi: 10.11858/gywlxb.2003.02.009

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Abstract:
In this paper, the shear fracture performances of LY12 aluminum cylinder were studied under explosive loading. The recovered fragments showed shear characteristics. The fracture surface formed along the maximum shear stress curves. SEM images of the recovered fragments illustrate that the fracture s...

Estimation of Thickness of Melted Layer near Explosive Welding Interface

YAN Hong-Hao, LI Xiao-Jie, JIA Hong-Zhi, LI Hong-Sheng, XI Jin-Yi

2003, 17(2): 135-140 . doi: 10.11858/gywlxb.2003.02.010

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Abstract:
The temperature rise near explosive welding interface is caused by explosive adiabatic compression and abnormal deformation energy deposition. Through the calculation of temperature rise, the melting criterion was given, and the thickness of melted layer near explosive welding interface was estimate...

Study on the Catalytic Function of Li3N, Mg3N2, Ca3N2

XU Xiao-Wei, LI Yu-Ping, ZHAO Hong-Mei, FAN Hui-Li, ZHANG Yong-Jie

2003, 17(2): 141-144 . doi: 10.11858/gywlxb.2003.02.011

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Abstract:
It is well known that Li3N, Mg3N2 and Ca3N2 are catalysts for cBN synthesis under high temperature and high pressure. We discovered that they could also act as catalysts for hBN formation at high temperature and normal pressure. It is confirmed that, from a series comparative experiments, each of th...

Brim Effect of Negative Bias-Enhanced Nucleation of Diamond Film on Silicon Substrate

WANG Chuan-Xin, WANG Jian-Hua, MA Zhi-Bin, MAN Wei-Dong, WANG Sheng-Gao, KANG Zhi-Cheng

2003, 17(2): 145-149 . doi: 10.11858/gywlxb.2003.02.012

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Abstract:
Diamond nucleation improved by negative bias-enhanced technology on Si (100) substrate has been investigated on a microwave plasma enhanced chemical vapor deposition (MPCVD) apparatus using a gas mixture of methane and hydrogen. The results show that the bias voltage has a significant effect on the ...

Equation of State and Electric Properties of BaCuO2.5 under High Pressures

ZHANG Gong-Mu, BAO Zhong-Xing, LI Feng-Ying, LIU Cui-Xia, YU Ri-Cheng, Lü Tian-Quan, JIN Chang-Qing

2003, 17(2): 150-152 . doi: 10.11858/gywlxb.2003.02.013

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Abstract:
p-V relationship for BaCuO2.5 at room temperature and in the pressure range up to 4.5 GPa was obtained using a piston-cylinder type device. Its equation of state, Grneisen parameter 0, bulk modulus B0, and the first order pressure derivative of B0 were also acquired. The resistance versus pressure (...

Curve-Fitting Method for Determining the Delay-Time in SHPB Experiments

XU Ming-Li, ZHANG Ruo-Qi, ZHANG Guang-Ying

2003, 17(2): 153-156 . doi: 10.11858/gywlxb.2003.02.014

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Abstract:
With the pre-determined density of specimen, the elastic velocity can be solved by the shape fitting of the predicted transmission wave with the measured transmission wave in the initial stage, and then the delay-time in SHPB data processing can be determined.

Elastic Properties of MgCNi3 Superconductor under Hydrostatic Pressure

ZHOU Bo, WANG Ru-Ju, ZHANG You-Lin, LI Feng-Ying, YU Ri-Cheng, JIN Chang-Qing

2003, 17(2): 157-160 . doi: 10.11858/gywlxb.2003.02.015

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Abstract:
Using Pulse-Echo Overlap Method, the velocities of longitudinal and shear waves of Ceramic MgCNi3 superconductor were measured up to hydrostatic pressure of 0.5 GPa. The bulk modulus B, shear modulus G, Debye temperature and specific heat under pressure were calculated. The values of Debye temperatu...

2003 Vol. 17, No. 2

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