On the crystal structure of Cr2N precipitates in high-nitrogen austenitic stainless steel. II.1 Order-disorder transition of Cr 2N during electron irradiation

Tae Ho Lee, Sung Joon Kim, Setsuo Takaki

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The crystal structure and order-disorder transition of Cr2N were investigated utilizing transmission electron microscopy (TEM). Based on the analyses of selected-area diffraction (SAD) patterns, the crystal structure of the ordered Cr2N superstructure was confirmed to be trigonal (P̄31m), characterized by three sets of superlattice reflections (001), (11/33 0) and (11/33 1). During electron irradiation, the superlattice reflections gradually disappeared in the regular sequence (001), (11/33 0) and (11/33 1), indicating that the order-disorder phase transition of Cr 2N occurred. The convergent-beam electron diffraction (CBED) observation revealed that the space group of disordered Cr2N is P62/mmc, which corresponds to an h.c.p. (hexagonal close packed) sublattice of metal atoms with a random distribution of N atoms in six octahedral interstices. The redistribution model of N atoms through the order-disorder transition is discussed based on the characteristics and disappearing sequence of superlattice reflections.

Original languageEnglish
Pages (from-to)190-196
Number of pages7
JournalActa Crystallographica Section B: Structural Science
Volume62
Issue number2
DOIs
Publication statusPublished - Apr 1 2006

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Electron irradiation
Order disorder transitions
Stainless Steel
Austenitic stainless steel
Precipitates
Nitrogen
Crystal structure
Electrons
Atoms
Phase Transition
Transmission Electron Microscopy
Metals
Observation
Electron diffraction
Diffraction patterns
Phase transitions
Transmission electron microscopy
austenitic steel

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

On the crystal structure of Cr2N precipitates in high-nitrogen austenitic stainless steel. II.1 Order-disorder transition of Cr 2N during electron irradiation. / Lee, Tae Ho; Kim, Sung Joon; Takaki, Setsuo.

In: Acta Crystallographica Section B: Structural Science, Vol. 62, No. 2, 01.04.2006, p. 190-196.

Research output: Contribution to journalArticle

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N2 - The crystal structure and order-disorder transition of Cr2N were investigated utilizing transmission electron microscopy (TEM). Based on the analyses of selected-area diffraction (SAD) patterns, the crystal structure of the ordered Cr2N superstructure was confirmed to be trigonal (P̄31m), characterized by three sets of superlattice reflections (001), (11/33 0) and (11/33 1). During electron irradiation, the superlattice reflections gradually disappeared in the regular sequence (001), (11/33 0) and (11/33 1), indicating that the order-disorder phase transition of Cr 2N occurred. The convergent-beam electron diffraction (CBED) observation revealed that the space group of disordered Cr2N is P62/mmc, which corresponds to an h.c.p. (hexagonal close packed) sublattice of metal atoms with a random distribution of N atoms in six octahedral interstices. The redistribution model of N atoms through the order-disorder transition is discussed based on the characteristics and disappearing sequence of superlattice reflections.

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