学术
Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe powder prepared by mechanical alloying
Islam S. Humail Xuanhui Qu Chengchang Jia Mingli Qin Xinbo He
State Key Laboratory for Advanced Metals and Materials, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing100083, China
文章出处:
《北京科技大学学报：英文版》-2006年13卷5期 -442-445页
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相关文章:
Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe powder prepared by mechanical alloying
Islam S. Humail（State Key Laboratory for Advanced Metals and Materials, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China） Xuanhui Qu（State Key Laboratory for Advanced Metals and Materials, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China） Chengchang Jia（State Key Laboratory for Advanced Metals and Materials, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China） Mingli Qin（State Key Laboratory for Advanced Metals and Materials, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China） Xinbo He（State Key Laboratory for Advanced Metals and Materials, Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:
The mechanism of mechanical solid-state reactions for formation of tungsten heavy alloy powder was discussed. A highenergy 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 powders. 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.[著者文摘]
Key words:
tungsten heavy alloys; mechanical alloying; particle size; morphology
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