人工时效Co₆₆Fe₄V₂Si₈B₂₀金属玻璃非晶相分离的研究

人工时效Co 66 Fe 4 V 2 Si 8 B 20 金属玻璃非晶相分离的研究 INVESTIGATION ON THE SEPARATION OF AMORPHOUS PHASE IN AGED METALLIC GLASS Co 66 Fe 4 V 2 Si 8 B 20 黄胜涛 Huang Shengtao and Cao Jian 1 first-author 曹建 1 中南工业大学 中南工业大学 本文利用x射线衍射技术、x射线小角散射技术、透射电子显微术和示差扫描量热法研究了经人工时效的Co 66 Fe 4 V 2 Si 8 B 20 金属玻璃中非晶相分离现象。实验结果一致证明,该样品在200℃ < T < Tg温度范围内经较长时间的人工时效就会产生非晶相分离,分离进行的机制是成核-长大,析出相的结构比母相更有序,是以二十面体作结构单元构成的。 The separation phenomena of amorphous phase in aged metallic glass Co 66 Fe 4 V 2 Si 8 B 20 have been investigated by x-ray diffraction method （XDM）, small angle x-ray scattereng technique （SAXS）, transmision electron microscopy （TEM） and differential scanning calorimetry（DSC）. The structure, content and grain size of amorphous precipitates in aged samples have been determined by XDM and TEM respectively; the glass transition temperatures of separated phases and temperature for phase separation at begining have been determined by DSC. All results have verified that separation of amorphous phase would take place in these samples after being aged in 200℃ < T < Tg for rather long time, the mechanism of separation was nucleation-growth, the structure of precipitates, which can be constructed by using icosahedron structural units, was more order than the matrix. 中国科学院科学基金 1986-02-01 2021-04-01 2