Mössbauer and X-Ray Characterization of Fe0.2Mn0.4Al0.4 Mechanically Alloyed Powders

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• 作者：Gonz&aacute ; lez ; Claudia P. ; Greneche ; J. M. ; Pé ; rez Alc&aacute ; zar ; G. A. ; Tabares ; J. A.
• 关键词：mechanical alloying ; 57Fe M枚ssbauer spectrometry ; X ; ray diffraction
• 刊名：Hyperfine Interactions
• 出版年：2003
• 出版时间：2003
• 年：2003
• 卷：148/149
• 期：1/4
• 页码：317-324
• 全文大小：83 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Nuclear Physics, Heavy Ions and Hadrons
  Atoms, Molecules, Clusters and Plasmas
  Condensed Matter
  Surfaces and Interfaces and Thin Films
  
• 出版者：Springer Netherlands
• ISSN：1572-9540

文摘

A series of powders of Fe_0.2Mn_0.4Al_0.4 system were produced by mechanical alloying for 2, 4, 6, 8, 12, 24 and 48 hours milling and then characterized by ⁵⁷Fe Mössbauer spectrometry and X-ray diffraction at room temperature. X-ray patterns reveal the presence of Bragg peaks due to fcc Al, fcc Mn, and bcc Fe parent powders, whenever the alloying time is ranged from 2 to 12 hours, but the intensity of those peaks decreases when the alloying time increases. Also can be noted the rise of new broadened peaks, from 6 h alloying; their intensity increases with the alloying time. Those peaks correspond to the occurrence of a bcc and a fcc structural-type, attributed to the formation of the ternary FeMnAl alloys which are consolidated for longer alloying times. These phases are typical for alloys with high Mn content as well. Three regimes can be distinguished from the evolution of both room-temperature Mössbauer spectra and X-ray pattern as a function of alloying time.