物理化学学报 >> 2001, Vol. 17 >> Issue (08): 750-752.doi: 10.3866/PKU.WHXB20010817

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退火晶化过程中Ni-B纳米非晶态合金的结构

韦世强;张新夷;刘文汉;王晓光;杨宏伟;闫文胜   

  1. 中国科学技术大学国家同步辐射实验室,合肥 230029
  • 收稿日期:2001-01-08 修回日期:2001-03-21 发布日期:2001-08-15
  • 通讯作者: 韦世强 E-mail:sqwei@ustc.edu.cn

Structural Study of Ni-B Ultrafine Amorphous Alloy during Annealed Crystallization

Wei Shi-Qiang;Zhang Xin-Yi;Liu Wen-Han;Wang Xiao-Guang;Yang Hong-Wei;Yan Wen-Sheng   

  1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029
  • Received:2001-01-08 Revised:2001-03-21 Published:2001-08-15
  • Contact: Wei Shi-Qiang E-mail:sqwei@ustc.edu.cn

摘要: 采用XAFS和XRD两种方法研究化学还原法制备的NiB纳米非晶态合金在退火过程中的结构变化.我们发现,在573 K左右的退火温度下, NiB纳米非晶态合金生成亚稳的纳米晶Ni和Ni3B.在773 K或更高的退火温度下, NiB纳米非晶态合金大部分晶化为晶态金属Ni.

关键词: XAFS, XRD, Ni-B纳米非晶态合金

Abstract: Xray absorption fine structure (XAFS) and Xray diffraction (XRD) have been combined to investigate the structure of NiB ultrafine amorphous alloy prepared by chemical reduction during the crystallization process. The results demonstrate that a fcclike nanocrystalline Ni phase with a mediumrange order and a nanocrystalline Ni3B alloy are formed at 573 K where the first exothermic process is observed. At annealing temperature of 773 K, large amount of NiB ultrafine amorphous alloy decomposes into metal Ni.

Key words: XAFS, XRD, Ni-B ultraine amorphous alloy