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Effects of Alloying Elements on Twinning in Ni-Based SuperalloysMicro-twinning is the major creep deformation mechanism in Ni-based superalloys at temperatures above 700 C. Recent experiments suggest that superlattice stacking faults in   phase may serve as the precursors to twin formation. Segregation of alloying elements to these precursors may have a significant effect on formation and extension of micro-twins. Using atomistic modeling we investigate and explain the effects of Cr and Nb alloying additions on these processes. Our results help to rationalize the experimentally observed puzzling effects of elemental composition of the alloy on creep resistance.
Document ID
20230010764
Acquisition Source
Ames Research Center
Document Type
Extended Abstract
Authors
Valery V Borovikov (Wyle (United States) El Segundo, California, United States)
Mikhail I Mendelev (Wyle (United States) El Segundo, California, United States)
Timothy M Smith (Glenn Research Center Cleveland, Ohio, United States)
John W Lawson (Ames Research Center Mountain View, California, United States)
Date Acquired
July 24, 2023
Publication Date
September 8, 2024
Publication Information
URL: https://www.tms.org/superalloys2024?WebsiteKey=80bde005-56ec-42ca-8e35-1c14d26676ac
Subject Category
Metals and Metallic Materials
Meeting Information
Meeting: The 15th International Symposium on Superalloys
Location: Champion, Pennsylvania
Country: US
Start Date: September 8, 2024
End Date: September 12, 2024
Sponsors: Minerals Metals and Materials Society
Funding Number(s)
CONTRACT_GRANT: ISRDS-3 80ARC020D0010
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Ni-based superalloys
atomistic modeling
creep deformation mechanisms
micro-twinning
effects of solute additions

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