Atomic configurations of various kinds of structural intergrowth in the polytypic M2B-type boride precipitated in the Ni-based superalloy

X. B. Hu, Y. L. Zhu, X. H. Shao, H. Y. Niu, L. Z. Zhou, X. L. Ma*

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The heavily faulted M2B-type borides precipitated in the long-term aging Ni-based superalloys with B addition are comprehensively studied at an atomic scale. By means of high angle annular dark field (HAADF) imaging technique in the aberration corrected scanning transmission electron microscope (STEM), atomic configurations of various kinds of structural intergrowth in the profoundly faulted M2B phase are directly imaged. The polytypic M2B phase is mainly composed of C16, Cb and Ca structural variants, in which planar defects and the resultant long period stacking order (LPSO) structure are identified. In combination of the advanced spectrometry imaging technique with density functional theory (DFT) calculations, it is proposed that the polytypic feature is attributed to the conservation of the basic polyhedron of anti-square prisms.

Original languageEnglish (US)
Pages (from-to)64-72
Number of pages9
JournalActa Materialia
Volume100
DOIs
StatePublished - Nov 1 2015

Keywords

  • Aberration corrected transmission electron microscope
  • Atomic configurations
  • Ni-based superalloy
  • Polytypic MB-type boride
  • Structural intergrowth

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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