机械合金化Fe-Cr-W-Ti-Y-(O)粉末特性

Characteristics of Fe—Cr—W—Ti—Y—(O) powders produced by mechanical alloying

通过机械合金化制备了Fe-Cr-W-Ti-Y-(O)合金粉末,研究了球磨时间和球磨介质硬脂酸添加量对粉末特性的影响.结果表明:随着球磨时间的延长,元素粉末的合金化程度、加工硬化效应及氧元素含量提高,晶粒尺寸减小;球磨48h后,W和Cr原子已完全固溶于α-Fe中,合金粉末晶粒尺寸减小至14.0nm,显微硬度(HV)为613.4,氧含量(质量分数)达到0.935%;加入一定量的硬脂酸可以有效地阻碍粉末颗粒的团聚并优化粉末的颗粒形貌和粒度分布,但会延缓粉末合金化进程.

Fe—Cr—W—Ti—Y—（O） powders were fabricated by mechanical alloying （MA） in this work.The effect of milling time and stearic acid （SA） content on characteristics of the milled powders were studied by X-ray diffraction（XRD）,scanning electron microscope （SEM） and energy dispersive X-ray spectroscopy,etc.The results show that with the increasing of milling time,the alloying degree,microhardness and oxygen content of the milled powders increase,while the average grain size of powders decrease.After 48 h milling,W and Cr have dissolved in α-Fe completely,the average grain size of powders have been reduced to 14.0 nm,the microhardness （HV） is 613.4,and the oxygen content is 0.935%.The presence of SA could efficiently hinder agglomerations,optimize morphology and particle size distribution of powders,but retard diffusion between elements.