By analyzing characteristics of the kinetic energy consumption of single Al-plate and double-wall structure of Al-plate, which were just subjected to dynamic impact effect of an Al-sphere, the protection performance of the double-wall structure against the impact effect of high velocity projectiles is investigated in terms of the critical impact kinetic energy for the failure of the single Al-plate by the impact conditions that the projectile sphere was broken or not when it hit. Meanwhile, the experimental verification of the protection performance of the typical protective structures is carried out. Results show that the critical impact kinetic energy causing the single Al-plate to failure is approximately constant for a certain thickness of the plates. After penetrating the first wall, the residual kinetic energy of the projectile is proportionally reduced from the initial impact kinetic energy for the case of double-wall structure of Al-plate. In the range of impact velocities corresponding to the occurrence of shot fragments, the greater in diameter of the subsequent projectile fragment might cause the perforation failure of the rear wall of the double-wall structure of Al-plate, thus which should possessed the greater proportion of the sum residual kinetic energy of the total fragments in the secondary debris cloud.

The hydration heat release behavior of magnesium phosphate cement (MPC) was investigated by isothermal calorimeter. Results show that according to the feature of reaction processes, the hydration of MPC could be divided into five periods, such as the initiation, dissolution of MgO, growth of Mg(H₂O)₆²⁺, accelerating growth of MgKPO₄·6H₂O (MKP), as well as decelerating growth and stable period of MKP. Meanwhile, the activation energy of each stage was acquired by Arrhenius formula. The hydration of MPC needed to be excited by the acidic environment. With the extend of hydration time, H⁺ was consumed in the hydration system, and then the hydration system became alkaline gradually because of the slightly soluble nature and hydrolysis of MgO in water. In the early hydration stage of MPC the hydration product MKP crystallites grew and interconnected rapidly, which formed the frame of the whole structure of MPC and the compressive strength of MPC increased rapidly. After 8h of hydration, the growth rate of MKP decreased significantly, whilst the increase of compressive strength of MPC mainly depended on the integrity of interconnection of MKP crystallites.

The corrosion behavior of galvanized steel in the atmosphere by Qinghai Salt Lake at Northwest China was studied by means of weightlessness analysis, scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electrochemical analysis. The results showed that the corrosion weight loss of galvanized steel in the atmosphere by the Salt Lake was comparatively large, and the corrosion rate increased firstly and then tended to be stable. Corrosion products were mainly composed of Zn₅(OH)₈Cl₂·H₂O, Zn₅(CO)₃(OH)₆ and Zn₄SO₄(OH)₆·3H₂O,as well as lots of dust. The protective effectiveness for the substrate of the corrosion product layer decreased for a while and then tended to be stabilized during the corrosion process. The dust with high chloride salt greatly affected the corrosion process.

The effect of laser heat treatment, in stead of the retrogression process within the traditional retrogression and re-aging (RRA) treatment, on the microstructure and mechanical property of 7075 Al-alloy was investigated. The results show that the laser heat treatment can effectively replace the regression process of RRA. The hardness of the resulted 7075 Al-alloy exhibits the aging feature with double peaks. After pre-aging, laser treatment (850 W, 2 mm/s) and re-aging, the hardness of 7075 Al-alloy reaches the value of the second peak-aged ones with the highest hardness of 181 HBW, which then presented oxidation-wear character during wear test. The second peak-aged alloy possesses higher hardness and much better tribological performance than the first peak-aged ones. Which may be ascribed to the large number of fine precipitates of η'- and η-phase within the laser treated 7075 Al-alloy.

3,3’-diethyl-5,5’,6,6’-tetrahydroxy-3,3’,2-trimethyl-1,1’-spirobisindane was synthesized from pyrocatechol and 2-butanone, then the yellow polymers of intrinsic microporosity (PIM-CO19) were prepared from the 3,3’-diethyl-5,5’,6,6’-tetrahydroxy-3,3’,2-trimethyl-1,1’-spirobisindane and 2,3,5,6-tetrafluorotere phthalonitrile. The structures and properties of the PIM-CO19 polymer were characterized by Fourier transform infrared (FTIR), mass spectrometry (MS), X-ray photoelectron spectrometer (XPS), differential scanning calorimeter (DSC), thermogravimetric analysis (TGA) and gas permeability test. The PIM-CO19 polymer membranes were thermally treated at 300℃, 350℃ and 400℃ in N₂ atmosphere, respectively. The structures and properties of the PIM-CO19 based thermally induced rigid membranes were characterized by FTIR, X-ray diffraction (XRD) and the gas permeability testing. The results show that the crosslinking reaction of PIM-CO19 was thermally induced, and the gas permeabilities of the PIM-CO19 based thermally induced rigid membranes were further improved by controlling the processing temperature. Especially for the PIM-CO19-350, the permeabilities of H₂, O₂, N₂, CO₂ and CH₄ are 1758 Barrer, 586 Barrer, 180 Barrer, 4075 Barrer and 277 Barrer separately. When the treatment temperature reached 400℃, the permeabilities of the gas separation membranes were decreased, but the selectivity was improved. The selectivity of O₂/N₂ and CO₂/CH₄ were 4.76 and 38.78, respectively.

The corundum structure oxide films were successfully deposited by HPPMS (High Power Pulsed Magnetron Sputtering) method by reactive sputtering Al- and AlCr alloy-target respectively at low-temperature. The surface morphology, phase constituent, chemical composition and mechanical property of the as-deposited films were analyzed by SEM (Scanning Electron Microscopy), GIXRD (Grazing Incidence X-ray Diffraction), EDS (Energy Dispersive Spectroscopy) and Hysitron TI 950 nanoindentation, respectively. Results show that Al₂O₃ films deposited by sputtering Al target contain a large number of droplet-particles caused by micro-arcing on the target-surface during reactive sputtering process. The droplet-particles not only increase the surface roughness but micro-porosity in the film as well, which then greatly decreases the film hardness. The micro-arcing can be effectively eliminated by using Al-50% Cr alloy target. The stable sputtering process ensures the deposition of smooth and compact films, thereby increases the film hardness greatly. The corundum phase films of α-(Al,Cr)₂O₃ could be fabricated at 540℃ and 10% O₂ partial pressure.

The effect of substrate bias voltages on the microstructure, optical- and electrical- properties of a-C films prepared by HiPIMS were investigated on silicon wafers and quartz glass respectively. Results show that different substrate biases lead to the change of microstructure of the a-C films. The sp² content of a-C film prepared at bias of 0 ~ -300 V is (52.5±1.5)%. When the voltage was -50 V, the size of sp² cluster reached the maximum (1.93 nm), yet the optical band gap (0.15 eV) and resistivity (0.32 Ω·cm) were minimum. Then the size of sp² cluster decreased first and then increased with the increase of bias voltage, while the optical band gap and resistance of the films presented opposite tendency according to the cluster model. The size of sp² clusters in a-C films by HiPIMS played the key role in the optical and electrical properties. The larger the size of the film sp² cluster was, the smaller optical band gap and resistivity were.

The impact toughness and fracture toughness were studied for 20CrNi2Mo steel quenching at different temperatures and the hierarchical microstructures obtained were investigated by OM, SEM, EBSD and TEM. Results showed that materials quenching at 1200℃ had best toughness in which the fracture toughness and impact absorption energy increased 43.58% and 27.78%, respectively. The size of prior austenite grain (d_r), packet (d_p) and block (d_b) was increased with the increase of quenching temperature, while the martensite lath (d _l) was decreased slightly with the coarsen of prior austenite grain. It was proved that the effective control unit of toughness for the tested steel was martensite lathes by crack propagation path analyzing and the statistic of dimple size combined with the Hall-Petch formula. In addition, the difference of plastic deformation was declared by EBSD and the relationship between fracture toughness and impact toughness during crack propagation process was calculated.

The anodizing film on Ti6Al4V was prepared via anodic oxidizing in electrolyte of 0.5 mol/L hydrofluoric acid with different addition amount of 5 g/L Ca(H₂PO₄)₂. Then the effect of Ca and P on the phase composition, surface morphology and adhesive strength of the anodizing film was investigated. Hydroxyapatite coatings were deposited on the Ti6Al4V with oxidizing film by hydrothermal-electrochemical method and then of which the biological activity was examined by cell adhesion experiment. Results show that the diameter of TiO₂- tubes of the anodizing film prepared in the bath with Ca(H₂PO₄)₂ was lager than that without Ca(H₂PO₄)₂, and the Ca- and P-content for the former film increased, especially Ca. HA coatings presented layered structure, of which the much compact inner portion composed of rod-like grains and the top portion presented flocculent oxidizing film. The adhesive strength between the coating and the substrate increases from 18.93 MPa to 23.74 MPa. During the cell adhesion experiment, it was easily for cells to attached on the flocculent surface of HA coatings, which can supply bigger space for cells to live, therewith, increasing the combination of implants and the human body.

Plates of a hull steel were weld via CO₂ gas-shielded arc welding with marine high strength flux-cored wire as filler and by three different heat inputs i.e. 8 kJ/cm,14 kJ/cm and 20 kJ/cm respectively, while the effect of heat input on the microstructure and low-temperature flexibility of the weld seams was investigated by means of optical microscopy, scanning electron microscopy, transmission electron microscopy and materials-electron backscatter diffraction. Results show that the microstructure of the weld metal consists of mainly acicular ferrite, ferrite side-plate and a small amount of residual austenite for three different heat inputs. As the heat input increases the ferrite changes from acicular to lath, in which the acicular ferrite content decreases, side-plate ferrite increases and the residual austenite between them also changes from film-like to block. In addition, with the increasing heat input, inclusions with diameter below 1 μm in the deposited metal decrease, while the total amount of inclusions increases, and the large angle grain boundaries between the strips decrease. Consequently, the low-temperature flexibility of the weld seam decreases, and the fracture surface also transformed from dimple- and quasi cleavage-like to cleavage-like.

It reveals that the highest room-temperature ductility of the rolled sheets of Fe-6.5%Si (mass fraction) alloy is 0.8%, while the average tensile elongations of hot drawn wires are more than 1%. Furthermore, the maximum tensile elongation of the wires reaches 5.6%. By analyzing the microstructure, ordered structure, and deformation texture of the alloy, it follows that the ordered structure and deformation texture play important roles in improving the plasticity. This can be attributed to the structural change of B2 ordered structure and a strong <110> fiber texture of the wires.