【摘要】 采用透射电子显微镜和正电子湮灭技术研究了低周疲劳过程中快凝Al Fe V Si Nd合金微结构的变化 ,发现 :经高载荷循环后晶内固溶元素析出产生偏聚体 ,且随循环次数的增加 ,偏聚体长大 ;当循环次数达到 15 0 0次后 ,随循环次数的继续增加 ,大于临界尺寸的偏聚体长大而小于临界尺寸的偏聚体重新溶解·更多还原

【Abstract】 The variation of microstructure of rapidly solidified Al Fe V Si Nd nanocrystalline alloy ribbon during low cycles fatigue was studied by TEM and PAT(positron annihilation technology). G P zones appear and grow with the increase of cycles; After 1?500 cycles, the G P zones grow continuously with the increase of cycles when the zone size is larger than the critical size and G P zones dissolve again when the zone size is smaller than the critical size.更多还原