M枚ssbauer effect study of fine atomic structure of Fe₅₀Al₄₀Ni₁₀ powders

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• 作者：F. Hadef^a ; ^{hadef77@yahoo.fr} ; A. Otmani^a ; A. Djekoun^b ; J.M. Grenè ; che^c
• 关键词：Nanostructures ; Mechanical alloying ; 57Fe Mö ; ssbauer spectrometry ; Local environment
• 刊名：Superlattices and Microstructures
• 出版年：2012
• 期刊代码：122_07496036
• 类别：ms
• 出版时间：June, 2012
• 卷：51
• 期：6
• 页码：952-958
• 文件大小：481 K

摘要

In the present paper, we discuss the local atomic environment of Fe atoms in the mechanically alloyed Fe₅₀Al₄₀Ni₁₀ powders on the basis of hyperfine data estimated from ⁵⁷Fe M枚ssbauer spectra. B_hf decreases with increasing milling time due to the diffusion of Al and/or Ni into Fe grains. Nickel atoms did not diffuse inside the first coordination sphere of Fe and if the diffusion takes place the number is not more than one atom. Analyses of P(B_hf), indicate that the high hyperfine field values ranging from 30 to 33 T have to be partially attributed to Fe crystalline nanograins and the presence of the defects in them, the hyperfine field values ranging from 15 to 30 T can be associated to the nanocrystalline bcc Fe(Al, Ni) solid solution while the low hyperfine field values (<15 T) result from Fe atoms located in the disordered grain boundaries.