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您的检索式：作者名="Islam S. Humail"
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| 1 | Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe powder prepared by mechanical alloying显示文摘The mechanism of mechanical solid-state reactions for formation of tungsten heavy alloy powder was discussed. A high-energy ball mill operating at room temperature was used for preparing tungsten heavy alloy powders,starting from elemental tungsten (W),nickel (Ni),and iron (Fe) powders. X-ray diffraction (XRD),particle size analyzer,scanning electron microscopy (SEM),and transmission electron microscopy (TEM) were used to follow the progress of the mechanical solid-state reaction of W,Ni,and Fe pow-ders. These morphological studies revealed three stages in the milling process. In the first stage,the particle deformation changes the irregular structure of the as-received powder particles to flattened morphology,and the average particle size increases. In the second stage,the powder is sufficiently deformed and the tendency to fracture predominates over welding,and the particle size decreases. With continuous milling,the system reaches steady state,and relatively small and uniform particle size distribution is obtained after 20 h of milling. | Islam S. Humail | 2006 | Journal of University of Science and Technology Beijing2006，13，5： | 4 |
| 2 | Low-temperature oxidation behavior of MoSi_2 powders显示文摘The oxidation behavior of molybdenum disilicide (MoSi2) powders at 400, 500, and 600oC for 12 h in air were investi- gated by using X-ray diffraction (XRD) and transmission electron microscopic (TEM) techniques. Significant changes were observed in volume, mass, and color. Especially at 500oC, the volume expansion was found to be as high as 7-8 times, the color changed from black to yellow-white, and the mass gain was about 169.34% after 8 h, with SiO2 and MoO3 as main reaction products. The gains in volume and mass were less at 400 and 600oC compared with those at 500oC, probably due to the less reaction rate at 400oC and the formation of silica glass scale at 600oC, which would protect the matrix and restrain the diffusion of oxygen and molybdenum. Thus, the accelerated oxidation behavior of MoSi2 powder appeared at 500oC and the volume expansion was the sign of accelerated oxida- tion. | Peizhong Feng Xuanhui Qu Islam S. Humail Xueli Du | 2007 | Journal of University of Science and Technology Beijing2007，14，6： | 2 |
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