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机械合金化Fe100-xCux体系的X射线吸收精细结构研究

闫文胜 范江玮 李玉芝 崔宏滨 刘文汉 张新夷 韦世强

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机械合金化Fe100-xCux体系的X射线吸收精细结构研究

闫文胜, 范江玮, 李玉芝, 崔宏滨, 刘文汉, 张新夷, 韦世强

LOCAL STRUCTURES OF MECHANICALLY ALLOYED Fe100-xCux SOLID SOLUTIONS STUDIED BY X-RAY ABSORPTION FINE STRUCTURE

YAN WEN-SHENG, FAN JIANG-WEI, LI YU-ZHI, CUI HONG-BIN, LIU WEN-HAN, ZHANG XIN-YI, WEI SHI-QIANG
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  • 利用X射线吸收精细结构(XAFS)方法研究机械合金化制备的Fe100-xCux(x=0,10,20,40,60,70,80,100,x为原子百分比)合金中Fe和Cu原子的局域环境结构.对于Fe100-xCux(x≥40)二元混合物,球磨160h后,Fe原子的近邻配位结构从bcc转变为fcc,但Cu原子的近邻结构保持其fcc不变.与之相反,在Fe80Cu20和Fe90Cu10(x≤20)合金中,Fe原子的近邻配位保持其bcc结构而Cu原子的近邻配位结构从fcc转变为bcc结构.XAFS结果还表明,fcc结构的Fe100-xCux样品中Fe的无序因子σ(0.0099nm)比bcc结构的Fe100-xCux中的σ(0.0081nm)大得多;并且在机械合金化Fe100-xCux(x≥40)样品中Fe原子的σ(0.0099nm)比其Cu原子的σ(0.0089nm)大.这表明机械合金化Fe100-xCux样品中Fe和Cu原子可以有相同的局域结构环境但不是均匀的过饱和固溶体,而是由Fe富集区和Cu富集区组成的合金.我们提出互扩散和诱导相变机理来解释在球磨过程中Fe100-xCux合金产生从bcc到fcc和从fcc到bcc变化的结构相变
    The local structures of the immiscible Fe100-xCux alloys (x=0,10,20,40,60,80 and 100)produced by mechanical alloying have been investigated by XAFS.For the Fe100-xCux(x≥40) alloys,the local structures around Fe atoms change from bcc structure to fcc one,and the Cu atoms maintain the original coordination geometry after milling for 160 h. On the contrary, the local structures around Cu atoms in both Fe80 Cu20and Fe90 Cu10 alloys appears a transition from fcc to bcc structure.We found that the disorder factor σ(0.0099nm)of fcc Fe—Cu phase is larger than that (0.0081nm) of bcc Fe—Cu phase,and the σ(0.0099nm) around Fe atoms is larger than that (0.0089nm) of Cu in the Fe100-xCux(x≥40) alloys. This suggests that the mechanically alloyed Fe100-xCux alloys is not a homogeneous supersaturated solid solution,but consists of Fe-rich and Cu-rich regions for various compositions.A possible mechanism for bcc-to-fcc and fcc-to-bcc changes in Fe100-xCux alloys is discussed in relation to the interdiffusion and transition induced by the ball milling.
    • 基金项目: 中国科学院“百人计划”;国家自然科学基金(批准号:19604011)资助的课题.
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  • 文章访问数:  7715
  • PDF下载量:  501
  • 被引次数: 0
出版历程
  • 收稿日期:  2000-09-16
  • 修回日期:  2000-11-28
  • 刊出日期:  2001-02-05

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