Applied Mechanics and Materials Vols. 117-119

Abstract: Using tensile test of ZK60 magnesium alloy, the superplastic flow behavior was studied. The deformation temperature was set as 280°C, 310°C,340°C, 370°C and 400°C while strain rate was 1×10^-1s^-1, 1×10^-2s^-1, 1×10^-3s^-1 and 1×10^-4s^-1. The results showed that the perfect superplastic behavior was presented at 370°C and =1×10-4s-1 and the maximum elongation could be 133.7%. The biggest factor of strain rate sensitivity was 0.62. The microstructure of the fracture was analyzed used SEM and the results showed that the main deformation mechanism of ZK60 magnesium alloy was grain boundary sliding.

Abstract: A new generation of rigid polyurethane-imide foams were synthesized via the reaction of isocyanate terminated polyimide prepolymers extended by 3, 3-4, 4-benzo-phenonetetracarboxylic dianhydride with polyether polyol, and deionized water and pantane were used for blowing agent. The obtained polymers were analyzed with compression test and scanning electron microscopy (SEM). SEM analysis revealed the cellular structure with different density. The polyurethane-imide foams with high density had small cell diameter, thick film thickness and spherical shape. The opposite cellular structure appeared in low density polyurethane-imide foams with larger cell diameter, such as thin film thickness and polygonal cells. Compression tests exhibited the mechanical properties of PUIF increased with the density of polyurethane-imide foams increasing.

Abstract: Low carbon steel were coated by hot-dipping into a molten bath containing Al-2 wt%Mn, Al-9wt%Mn, Al-13wt%Mn, respectively. The phase composition, morphology and the adhesion of the aluminide layer were characterized by XRD, SEM, EDAX, OM and scratch tester. The results show that the coating layers is mainly composed of Al, FeAl₃, Fe₂Al₅ and MnAl₆ phase. The coatings consists of two-layers structure, i.e., topcoat Al-Mn alloy layer and tongue-like intermetallic compound, and the coating layer is about 800 μm thick. The adhesion of the Al-Mn alloy coatings were characterized by Lc value and were found to be about ~30N. The adhesion gradually decrease with the increase of the Mn contents in alloy coatings.

Abstract: The effect of Gd(gadolinium) on the microstructure and mechanical properties of aged AZ81 magnesium alloy were investigated. The results showed that 2wt.%Gd addition results in the obvious refinement of grain size, the decrease of β-Mg₁₇Al₁₂ phase and the formation of Al₂Gd phase, and improves the mechanical properties of AZ81 alloy at room and high temperature. After the addition of 2wt.%Gd, the tensile strengths are enhanced from 203.2MPa to 249.3MPa at room temperature and from 157.2MPa to 197.3MPa at 150°C. Meanwhile, the elongations are increased.

Abstract: In this experiment, pyrophyllite as the main materials used the flame photometer to measure adsorption. Using the qualitative analysis of the samples of XRD with internal structure and found that pyrophyllite used in the experiment as a natural mineral, the presence with other minerals. Meanwhile, scanning electron micrographs (SEM) from the display showed that the effect of pyrophyllite adsorption for cations should be more significant. Therefore, this experiment focused on the time, Na⁺ concentration, on the pyrophyllite and different pyrophyllite concentrations (adsorbent dosage) effect on the adsorption, in addition to the adsorption dynamics. The results showed that pyrophyllite adsorption sodium in the best time of equilibrium was 20 minutes, the concentration of NaCl was 50 mg/L, pH = 7, temperature was 313 K, the concentration of pyrophyllite was 5 mg/L.

Abstract: The Ni-based alloying powder was successfully used as the raw materials for fabricating surface infiltrated layers on cast steel ZG45 substrate through a vacuum infiltration casting technique (VICT). The microstructures of surface Ni-based infiltrated layer, the micro-hardness distribution are investigated. The infiltrated layer includes three areas that are surface part-melting area, melting completely fusion area and diffusion solid solution area. The main composition of surface infiltrated layer was intermetallic compound Cr₂B，NiB and solid solution. The main phase of transition layer was solid solution. The micro-hardness of Ni-based infiltrated layer presented gradient change from surface infiltrated layer to substrate. The average micro-hardness was about 550HV.

Abstract: In order to study the characteristics of a new kind of high-barrier and high-temperature sterilization and easy tear flexible plastic packaging materials applied in food packaging, the PET/AL/CPP was chosen as flexible plastic packaging material structure, different PET, CPP, alcohol inks, adhesives and other raw materials were selected for making a series of processing technology experiment and detection analysis. Then comparing the data obtained with the requirements, it was concluded that new flexible plastic packaging materials were extremely high resistance oxygen and resistance wet, high-temperature sterilization and good one-way easy tear, and etc.

Abstract: This paper presented a new kind of strand cable system, which cable body was composed by the strands isolated by HDPE sheath. The isolation extrusion method were used in anchoring the bundle of strands on the anchorage of both cable ends. The type of the cable-stayed structure, features, test and engineering design and application were described. The result shows that the cable system has compact anchorage structure and small diameter, which can be more stable to reach the correlative standards requirement on static load and fatigue performance. The cable system provides a new choice in the bridge construction and had been widely applied in China since 2005.

Abstract: Aim at technology of material surface modification with large scale pulse electron beam, the principle of electronic beam processing was analysed. Mechanism for material surface modification with large scale pulse electron beam was discussed. The technique of material surface modification was divided into dealing directly with electron beam and dealing after coating with electron beam. Then the state of art of material surface modification with large scale pulse electron beam was analysed. And existing problems were pointed out and the trend of develop was summaried.

Abstract: In this paper, TiO₂/Ag/TiO₂ and TiO₂/Ag/ZnS films were prepared by evaporation coating (EC) and magnetron sputtering (MS). To test the resistance and light transmission rate to characterize the coating effect, both the size of indirect resistance that the relative thickness of the situation. By comparing the single magnetron sputtering and evaporation coating fabricated by the two transparent conductive oxide films (TCO) material conductivity and light transmission properties, determine a reasonable process. Firstly, the first layer is TiO₂ film by magnetron sputtering, and then coating Ag film and ZnS film plated by evaporation, the final form of TiO₂/Ag/ZnS film, which ha_{Subscript text}d much higher transmittance than TiO₂/Ag/TiO₂ at the same resistanc_{Subscript text}e.