Reveal the stacking fault shearing mechanism by its annihilation process in Ni-based single crystal superalloys

Pengfei Qu, Wenchao Yang, Jiarun Qin, Kaili Cao, Chen Liu, Jun Zhang, Lin Liu

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Based on the reversibility of stacking fault formation, the annihilation process during annealing was characterized to reveal the stacking fault shearing mechanism in Ni-based single crystal superalloys. After the creep rupture test at 750 °C/750 MPa, lots of stacking faults would be created in γ' precipitates. Further annealing at 1000 °C for 4 h, these stacking faults would shrink and were transformed into dislocation pairs containing two a/2 〈110〉 dislocation with different Burgers vectors. Finally, the stacking fault shearing mechanism could be clarified as:a/21¯01+a/201¯1→a/31¯1¯2+SF+a/61¯1¯2.

Original languageEnglish
Article number111419
JournalMaterials Characterization
Volume180
DOIs
StatePublished - Oct 2021

Keywords

  • Dislocation pair
  • Ni-based single crystal superalloys
  • Shearing mechanism
  • Stacking fault

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