The in-situ angle dispersive X-ray powder diffraction of natural pyrope collected from Zhenyuan in China using synchrotron radiation has been measured under high pressure (0~25.3 GPa) conditions with diamond anvil cell (DAC). We have not found any convincing evidence for a phase transformation in the experimental pressure range. The XRD patterns were then refined by using the refinement module combined in the Materials Studio program. We fit the Birch-Murnaghan equation of state and obtained its ambient pressure bulk modulus B₀=199 GPa (B′₀=4).

Boron nitride (BN) thin film on diamond film substrate was synthesized by radio frequency (rf) magnetic sputtering physical vapor deposition. The field emission characteristics of diamond film and BN coated diamond film were measured in an ultrahigh vacuum system. Experiments demonstrate that BN film is effective in improving the field emission characteristics of diamond film. The threshold electric field is 12 V/μm and highest emission current density is 272 μA/cm² for the BN coated diamond film. The Fowler-Nordheim plots show that electron emission is due to tunneling over a barrier.

Homogeneous submicron PZT 95/5 powder was synthesized from the mixtures of Pb₃O₄, ZrO₂ and TiO₂ with Nb₂O₅ as an additive by a planar shock wave-loading device. The impact velocities of flyer plates on sample targets were adjusted by their thickness to obtain different shock conditions and to achieve the synthesis of PZT 95/5 powders in experiments. The analyses of XRD and SEM show that the shock-synthesized samples obviously became fine, and heavy distortion and many defects of lattices were formed in the process of shock compression.

The effects of high pressure and heat treatment on microstructure of aluminum bronze were investigated by means of metallographic, scanning electronic microscope (SEM)/energy disersive spectrometer (EDS) and X-ray diffraction (XRD). Results showed that the grain size of α phase in the aluminum bronze after the treatment at 750 ℃ and 6 GPa high pressure is smaller than that after treatment at 750 ℃ and normal pressure. When the aluminum bronze was treated at 750 ℃ and 6 GPa and followed by a treatment at 750 ℃ for 2 min, thin stripy α phase occurred in the aluminum bronze, and its amount increased but the amount of granular α phase decreased with increase of the cooling rate.

According to the non-sphericity characteristic of shock wave surface at close-field after cylindrical charge with end boost exploring under water, the propagation of shock near-field is recorded by frame camera within 36 μs after blasting, and the shape of shock on diverse time and situation is analyzed. The shock pressure of arbitrary point on the side of charge is measured through two streak cameras. Combined with the Rankine-Hugoniot relation, the pressure on shock front is gained, and the resolution is compared with LS-DYNA numerical value. It demonstrated that they are consistent relatively.

With considering unreacted explosives as composite and porous materials media, the shock Hugoniot of several typical explosives are calculated by using plus principle and calculation method of the Hugoniot of porous materials. The calculation results are in good agreement with the experimental data.

The high heat conductivity and the high temperature carbonization of diamond make it difficult to achieve high temperature on diamond anvil cell, and the temperature in sample chamber is difficult to control accurately. Here we used sputtered alumina film as heat resistant layer, and an experiment at high pressure and high temperature was performed for diaspore on diamond anvil cell. Most previous experiments about diaspore for structure studying were performed at ambient temperature, and few reports of high temperature experiments were found. The changes of lattice parameters and compressibility of a-, b- and c-axis were investigated. The disputed bulk modulus was obtained by combining the experimental and computational results, and the bulk modulus of sample at high temperature and ambient temperature was compared.

The experiments of cylindrical explosive isostatic pressing were carried out. The internal temperatures in pressed explosives were measured by thermocouples. A thermal/structural coupled model of the explosive isostatic pressing was set up. The numerical simulations of cylindrical explosive were conducted. The calculated pressures and temperatures in explosives were given. The deformations, pressures and temperatures distribution were analyzed. The calculated results indicated that each surface center of the cylindrical explosive was sunken by isostatic pressing. During the isostatic pressing of cylindrical explosive, the internal temperature of the explosives increases, and the temperature and pressure are not uniform.

Although the mechanical property of metal foams has been widely studied, there are some conflicting conclusions on the strain-rate effect and the inertia effect of metallic foams. For a deep understanding of the role of inertia in the dynamic response of cellular metals, finite element method is used to study the dynamic compression of 2D Voronoi honeycombs. Three deformation modes are formulated. “Numerical experiments” are conducted by changing the density of wall material and the impact velocity. Corresponding macroscopically-averaged stress-strain curves measured on the impact surface and support surface and the plateau stress of the “specimens” are obtained. According to the simulation results, the influence of inertia is analyzed. It is found that the inertia of the honeycomb has no effect on the stress-strain curve as the macroscopic deformation is homogeneous. However, the inertia effect will result in nonuniform deformation as the impact velocity is high, and thus the plateau stress is obviously increased.

Overstress assembly by heating is adopted to achieve pre-compression along the radial direction of disk-shaped LY12 Al samples. Different deviatoric stress can be obtained using the assembly methods. The spallation signals of these pre-compressed samples were measured with VISAR in light-gas gun shock experiments. The obtained data show that the pullback amplitudes of the free surface velocity in the samples varied significantly even under the same impact velocity. The material’s spallation strength is decreased with the incremental deviatoric stress. This method can be used to investigate the relation between spherical spallation and uniaxial strain spallation.