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用正电子湮没多普勒展宽能谱测量和分析了若干急冷淬火制备的薄带,表明软磁Fe基纳米晶合金中的缺陷(自由体积)远多(大)于其晶化前的非晶态;能够晶化成纳米晶的Fe基非晶制备态材料中的缺陷也多(大)于类似成分但又不能晶化成纳米晶的非晶态材料中的缺陷;Fe_(73.0)Cu_(1.0)Nb_(1.5)Mo_(2.0)Si_(13.5)B_(9.0)合金的急冷淬火制备态在热处理过程中,低温退火时缺陷减少,高于200℃的退火导致缺陷增加,纳米晶化后的进一步退火缺陷基本不增加;Fe_(73.0)Cu_(1.0)Nb_(1.5)Mo_(2.0)Si_(13.5)B_(9.0)合金纳米晶化后,在所选定的测量条件下没有发现正电子湮没参数随时间、温度的变化,说明该材料缺陷结构相当稳定。
A number of quenched ribbons were measured and analyzed by positron annihilation Doppler spread spectrum, indicating that the defects (free volume) in soft magnetic Fe-based nanocrystalline alloys are much (larger) than their pre-crystallization amorphous (73.0) Cu_ (1.0), Fe_ (73.0) Cu_ (1.0), Fe_ (73.0) Cu_ (1.0) During the quenching process of Nb 1.5 Nb 2.0 Si 13.5 13.5 B 9.0 alloy, the defects decreased during low temperature annealing. The annealing above 200 ℃ led to the increase of defects and the further annealing after nanocrystallization And the defects did not increase at all. After the nanocrystallization of the Fe_ (73.0) Cu_ (1.0) Nb_ (1.5) Mo_ (2.0) Si_ (13.5) B_ (9.0) alloy, no positron annihilation parameters were found under the selected measurement conditions Time and temperature changes, indicating that the defect structure of the material is quite stable.