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Deformation and Fracture Mechanism of Third-Generation Single Crystal Superalloy During In-situ Tension at Room Temperature
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Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

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    Abstract:

    The deformation and fracture of a third-generation single crystal superalloy during in-situ tension at room temperature were investigated at multiple scales by scanning electron microscope, electron back-scattered diffractometer, and transmission electron microscope to reveal the deformation and fracture mechanism during tension. The proportion of low angle boundaries (LABs) with angles from 2.5° to 5.5° increases during tension. The change in LABs is particularly pronounced after elongation over 7%. The initiation of microcracks is caused by {111}<110> slip systems. After initiation, the crack size along the stress direction increases whereas the size extension along slip systems is suppressed. The fracture mode of the alloy is quasi-cleavage fracture and the slip lines near the fracture are implicit at room temperature.

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[Wang Rui, Li Jiarong, Yue Xiaodai, Zhao Jinqian, Yang Wanpeng. Deformation and Fracture Mechanism of Third-Generation Single Crystal Superalloy During In-situ Tension at Room Temperature[J]. Rare Metal Materials and Engineering,2025,54(6):1410~1416.]
DOI:10.12442/j. issn.1002-185X.20240291

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History
  • Received:May 16,2024
  • Revised:June 05,2024
  • Adopted:June 19,2024
  • Online: June 10,2025
  • Published: June 09,2025