Direct evidence of Cottrell atmosphere and Suzuki segregation in Ni-Co-based superalloy deformed at room temperature
Year: 2026
Type: article
Abstract: 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.
Source: Materials Research Letters
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,459
Awards: G2356347983, G5596293200, G6710398752
OpenAlex ID: W7165163380