Crystallographic account of nano-scaled intergrowth of M2B-type borides in nickel-based superalloys

Xiaobing Hu, Y. L. Zhu, X. L. Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

M2B-type borides in nickel-based superalloys containing boron subjected to long-term aging treatments were investigated by means of analytical transmission electron microscopy. Contrast analysis and electron diffraction show that the boride precipitations have dual-phase structures (I4/mcm, C16; Fddd, Cb) with a high density of stacking faults. The faulted planes and displacement vectors are determined as (1 1 0)C16 and [ 11̄1]C16/4 in C16 structure and (1 0 0)Cb and [0 1 1]Cb/4 in Cb structure. Structural models based on a polyhedron of square anti-prisms are proposed not only to rationalize the stacking faults, 60 rotation twin and the intergrowth of structural variants, but also to interpret the newly observed structure in M2B-type borides.

Original languageEnglish (US)
Pages (from-to)70-81
Number of pages12
JournalActa Materialia
Volume68
DOIs
StatePublished - Apr 15 2014

Keywords

  • Intergrowth
  • MB-type boride
  • Nickel-based superalloy
  • Polytypic structure
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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