The results of SEM and EDXA show that the grain of Y_2O_3 is symmetrical distributed in the coating via Y_2O_3 modified,and the content of Al on the surface is up to 30.65%.
The experimental results show that Al-Ti-C-P grain refiner has excellent effect on eutectic Al-Si alloy and the main phases of Al-Ti-C-P grain refiner are TiAl3,TiC and AlP,It is also found that the TiC and TiAl3 particles in the melt can improve the modification effect of AlP to Al-Si alloy.
Three sets of Co-eemented tungsten carbide (94 wt.%WC-6wt.%Co) blades with different average grain size (0.5, 1.5 and 3 μm) were used as substrates placed in the electron aided hot filament chemical vapor deposition (EACVD) reactor to fabricate diamond thin films.
This precursor was calcined at 300°C for 1, 2 and 3 hours respectively, and then the nanocrystalline ZnO of different grain size were obtained.
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The average grain size of the hexagonal close-packed Ni particles evaluated by Scherrer equation is about 12 nm.
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The coarse grain H?lder exponent of the image pixels is first computed.
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Factors affecting distribution of microbiotic crusts in the grain-for-green land of the loess region, northern Shaanxi, China
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With the reduction of the parameter combination, the intergranular phase γ-(Fe, Ni) is formed in the grain boundaries of Ni-Al intermetallic matrix instead of the intergranular phase α-Fe, and large amount of intermetallics are obtained.
Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of #...
The change of the height of the carbon diffusion peak was observed during the process of decarburization of an α-iron specimen containing a small amount of carbon, and it was found that the height of the peak first decreases and then increases with time to a maximum value twice. This indicates that the carbon adsorbed in iron goes twice into solid solution during the process of decarburization. The first re-dissolving phenomenon occurs sooner and the amount of carbon involved is comparatively less than that...
The formation of Widmanst(a|¨)tten structure of alpha iron in hypoeutectoidsteels was investigated in 0.27,0.40,0.52 and 0.60% carbon steels.Specimenswere heated to 860° and 1240℃ in vacuo and cooled at different rates to roomtemperature or isothermally treated at various temperatures between 650° and750℃ in vacuo.It was shown that the Widmanst(a|¨)tten structure of alpha ironproduced in 0.27,0.40 and 0.52% carbon steels was always accompanied by asurface relief of the type associated with bainite transform...