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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 2    April 2006

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Thermal behavior and structure of Fe84Nb7B9 nanocrystalline powders
CAO Ling-fei(曹玲飞)1, WANG Ming-pu(汪明朴)1, XIE Dan(谢 丹)1,
GUO Ming-xing(郭明星)1, LI Zhou(李 周)1, TAN Wang(谭 望)1, 2, XU Gen-ying(徐根应)1, 3

1.School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Zhuzhou Cemented Carbide Group Co Ltd, Zhuzhou 412000, China;
3.Department of Science and Technology of Anhui Province, Hefei 230001, China

Abstract:The thermal behavior of Fe84Nb7B9 nanocrystalline powders were analyzed by DTA, XRD and TEM measurements. The results show that nanocrystalline powders with grain size of less than 10 nm can be prepared by mechanical alloying. After annealed below 770 ℃, the obtained powders remain in the scale of nanometer without new phases formed, exhibiting good thermal stability. On its DTA curve, a wide temperature interval of 450 ℃ between its two exothermic peaks can be observed. The powders in as-milled state has bcc structure of supersaturated solid solution type, and nanocrystalline together with amorphous phases can be observed in the powder annealed at 350 ℃, which is beneficial for the good soft magnetic properties.

 

Key words: Fe84Nb7B9; nanocrystalline; amorphous phases; thermal behavior; magnetic properties

ISSN 1672-7029
CN 43-1423/U

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