Mechanical alloying of Mo-Si-Fe powders
来源期刊：中国有色金属学报(英文版)2002年第4期
论文作者：曹昱 易丹青 张松
文章页码：681 - 685
Key words：silicides；mechanical alloying；structure refinement；alloying effect
Abstract: Mechanical milling behavior of Mo-Si-Fe powders was investigated using XRD, SEM and TEM techniques. The mixtures of elemental molybdenum (>99%), silicon (>99%) and iron (>98%) powders with a stoichiometry of Mo5-xFexSi3(x=0.5, 1, 2) were milled in a planetary mill for up to 195h. For all three powder mixtures, high-energy milling of 60h led to formation of the Mo(Fe, Si) supersaturated solid solution (Moss); and to a remarkable expansion of the solubility of Fe, Si in molybdenum. The transformation of Moss to an amorphous phase was identified after longer time milling. In the milling process, the grain size of Mo (Fe, Si) decreased gradually and the internal stress increased linearly. After 40?h milling, the grain size was reduced to about 11nm. SEM analysis of mil l ed powders showed that the particle size increased initially with milling time. After 195h milling, particles exhibited a spherical morphology and the particle size were reduced to about 100nm.
