Atomic arrangement and formation of planar defects in the μ phase of Ni-base single crystal superalloys

Shiyu Ma, Xueqiao Li, Jianxin Zhang*, Jide Liu, Pan Li, Youjian Zhang, Huixin Jin, Wenyang Zhang, Yizhou Zhou, Xiaofeng Sun, Qing Zhang, Yanhui Chen, Shengcheng Mao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The internal characteristics of the μ phase in Ni-base single crystal superalloys aged at 1100 °C for 1000 h were investigated via spherical aberration-corrected transmission electron microscopy. There were a large number of planar defects on the (001) plane at the growth tip of the μ phase. HAADF-STEM results show that these planar defects were mainly of two types. 1) A twin structure with a mirror plane of the middle atomic planes of the Zr4Al3 sheet, which was generated by shearing of atoms in the MgCu2 sheet along the [1-10] direction. 2) A mirror-symmetrical stacking fault of two Zr4Al3 sheets, which was formed by the pulling out of a single MgCu2 sheet. The planar defects were mainly caused by coordination of the distortions of the μ phase and the matrix. Segregation of Mo, Cr, and Re elements occurred near stacking faults, rather than twin structures.

Original languageEnglish
Pages (from-to)775-783
Number of pages9
JournalJournal of Alloys and Compounds
Volume766
DOIs
Publication statusPublished - 2018 Oct 25
Externally publishedYes

Keywords

  • Atomic arrangement characteristics
  • HAADF-STEM
  • Ni-base single crystal superalloys
  • Planar defects
  • μ phase

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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