Microstructural characterization of the η-Ni3(Ti, Al) phase in a long-term-aged Ni-based superalloy

Xiaobing Hu, X. W. Guo, Y. J. Wang, J. S. Hou, X. Z. Qin, L. Z. Zhou, J. F. Liu, X. L. Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Microstructural features of a geometrically closed packed hexagonal η-Ni3(Ti, Al) phase precipitated in a long-term-aged Ni-based superalloy are characterised using various kinds of transmission electron microscope (TEM) techniques. The defect features in the η grain interior are clearly revealed at the atomic scale. A nano-sized γ′ phase is found at the defect regions of the micro-sized η phase. The interior γ′ phase keeps a good orientation relationship (OR) of (1 1 1)γ′//(0 0 0 1)η and [1 (Formula presented.) 0]γ′//[2 (Formula presented.) 0]η with the η-Ni3(Ti, Al) phase. However, there is no definitive OR between η-Ni3(Ti, Al) grains and the surrounding matrix. By means of first-principle calculations, we reveal that a symmetrical interfacial feature between γ′ and η corresponds to a lower energy state.

Original languageEnglish (US)
Pages (from-to)442-449
Number of pages8
JournalPhilosophical Magazine Letters
Issue number11
StatePublished - Nov 2 2017


  • Nickel-based superalloys
  • interfacial features
  • long-term ageing
  • transmission electron microscopy
  • η-Ni(Ti, Al) phase

ASJC Scopus subject areas

  • Condensed Matter Physics


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