Author:
Lee Tae-Ho,Oh Chang-Seok,Han Heung Nam,Lee Chang Gil,Kim Sung-Joon,Takaki Setsuo
Abstract
The crystal structure of Cr2N precipitates in high-nitrogen austenitic stainless steel was investigated by transmission electron microscopy (TEM). Based on the analyses of selected area diffraction (SAD) patterns, the crystal structure of Cr2N was confirmed to be trigonal (P\bar 31m) and was characterized by three sets of superlattice reflections: (001), (1\over 31\over 30) and (1\over 31\over 31). These could be explained in terms of the ∊-type occupational ordering of nitrogen. The static concentration waves (SCWs) method was applied to describe the ordered superstructure of Cr2N. The occupation probability function (OPF) for describing the distribution of N atoms in the Cr2N superstructure was derived based on the superlattice reflections obtained in the SAD patterns and could be expressed as: n({\bf r})=c-\textstyle{1\over 6}\eta_1\cos 2\pi z+{4\over 3}\eta_3\cos (2\pi/3)(x+y+3z). The crystallographic models for ∊-type ordering, mainly suggested in the Fe–N system, were discussed in comparison to the present model.
Publisher
International Union of Crystallography (IUCr)
Subject
General Biochemistry, Genetics and Molecular Biology,General Medicine
Cited by
35 articles.
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