Kink structures induced in nickel-based single crystal superalloys by high-Z element migration

Fei Sun, Jianxin Zhang, Shengcheng Mao, Ying Jiang, Qiang Feng, Zhenju Shen, Jixue Li, Ze Zhang, Xiaodong Han

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Here, we investigate a new type of kink structure that is found at γ/γ′ interfaces in nickel-based single crystal superalloys. We studied these structures at the atomic and elemental level using aberration corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The core of the dislocation absorbs high-Z elements (i.e., Co and Re) that adopt hexagonal arrangements, and it extrudes elements (i.e., Ni and Al) that adopt face centered cubic (fcc) structures. High-Z elements (i.e., Ta and W) and Cr, which is a low-Z element, are stabilized in body centered cubic (bcc) arrangements; Cr tends to behave like Re. High-Z elements, which migrate and adopt a hexagonal structure, induce kink formation at γ/γ′ interfaces. This process must be analyzed to fully understand the kinetics and dynamics of creep in nickel-based single crystal superalloys.

Original languageEnglish
Pages (from-to)750-754
Number of pages5
JournalJournal of Alloys and Compounds
Volume618
DOIs
Publication statusPublished - 2015 Jan 5
Externally publishedYes

Keywords

  • Creep
  • High-angle annular dark-field (HAADF)
  • Interface
  • Microstructure
  • Nickel alloys
  • scanning transmission electron microscopy (STEM)

ASJC Scopus subject areas

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

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