Interfacial precipitation of the M5B3-type boride in Ni-based superalloys

Xiaobing Hu, L. Z. Zhou, J. S. Hou, X. Z. Qin, X. L. Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Microstructural characteristics of an experimental Ni-based superalloy with boron addition subjected to a long-term ageing treatment were systematically investigated by various kinds of transmission electron microscopy technique. Based on detailed electron diffraction analyses, we found that there are many nanosized M5B3 precipitates in our long-term ageing alloys, which keeps a good orientation relationship with the γ/γ′ matrix. Furthermore, the precipitation characteristics of M5B3 phase were clarified. It is found that the M5B3-type boride prefers to precipitate at the γ/γ′ interfaces and low-angle grain boundaries. These interfacial nanosized precipitates can play the role of pinning effect and are expected to be advantageous for postponing the γ′ rafting and low-angle grain boundary migration to some extent at high temperature.

Original languageEnglish (US)
Pages (from-to)273-279
Number of pages7
JournalPhilosophical Magazine Letters
Volume96
Issue number7
DOIs
StatePublished - Jul 2 2016

Keywords

  • MB-type boride
  • Nickel-based superalloys
  • interfacial precipitation
  • transmission electron microscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

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