Twinning-induced shear fracture of sub-micrometer Ni-based single-crystal superalloys at 900°C

Twinning-induced shear fracture of sub-micrometer Ni-based single-crystal superalloys at 900°C

Topologically close-packed (TCP) precipitates and deformation twins significantly impact the high-temperature performances of Ni-based single-crystal (SC) superalloys. However, their contributions to failure of superalloys remain unclear. This study, utilizing in situ thermal-nanomechanical testing...

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Bibliographic Details
Main Authors: Zhe Hong, Lingyi Kong, Xinbao Zhao, Xingpu Zhang, Huajie Yang, Jiangwei Wang, Ze Zhang
Format: Article
Language:English
Published: Taylor & Francis Group 2025-08-01
Series:Materials Research Letters
Subjects:
Ni-based single-crystal superalloys
Deformation twins
Twin boundary sliding
Shear fracture
Online Access:https://www.tandfonline.com/doi/10.1080/21663831.2025.2514032
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Summary:Topologically close-packed (TCP) precipitates and deformation twins significantly impact the high-temperature performances of Ni-based single-crystal (SC) superalloys. However, their contributions to failure of superalloys remain unclear. This study, utilizing in situ thermal-nanomechanical testing at 900°C, reveals a twinning-induced shear fracture in sub-micrometer superalloys containing TCP phases. Under <110>m tension, nanotwins nucleation dominates over the shear sliding at pre-existing σ/matrix interface, inducing shear fracture via the twin boundary (TB) sliding. Density functional theory calculations confirm that TBs exhibit weaker shear resistance than the σ/matrix interfaces. These findings provide insights into twinning-induced premature failure of SC superalloys under service conditions.
ISSN:2166-3831

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