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Direct evidence of Cottrell atmosphere and Suzuki segregation in Ni-Co-based superalloy deformed at room temperature
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DOI：10.1080/21663831.2026.2685802.png)
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Abstract
En 中文
The formation of superlattice stacking faults and microtwins in superalloys, especially how partial dislocations penetrate the ordered γ′ phase, remains a fundamental challenge. Although solute segregation and the above planar faults are typically linked to high-temperature creep, we observe Cottrell atmospheres and Suzuki segregation of Co and Cr elements as well as microtwinning in a Ni-Co-based superalloy during room-temperature tensile deformation, enabling a new disordering mechanism in the L12 structure. This chemical reorganization drastically lowered the energy barrier for dislocation cutting into γ′ precipitates, establishing a new framework for plastic deformation in superalloys that transcends conventional thermal activation models.
Keywords:
Ni-Co-based superalloys
stacking faults
Suzuki segregation
Cottrell atmosphere
microtwinning
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