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 language | English |
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Article number | 111419 |
Journal | Materials Characterization |
Volume | 180 |
DOIs | |
State | Published - Oct 2021 |
Keywords
- Dislocation pair
- Ni-based single crystal superalloys
- Shearing mechanism
- Stacking fault