Alloying effects on sulphur embrittlement of the γ-γ' interface of nickel-based single-crystal superalloys

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DOIResolve DOI: http://doi.org/10.1080/0950083031000064399
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TypeArticle
Journal titlePhilosophical Magazine Letters
ISSN0950-0839
Volume83
Issue3
Pages177189; # of pages: 13
AbstractFully first-principles calculations have been performed to investigate the alloying effect on the sulphur embrittlement of the ?- ?' interface of nickel-based single-crystal superalloys. The shear and cohesive strengths of the inter-face are calculated in terms of Mayer bond orders (BOs), and the ratio R BO of shear strength over cohesive strength is analysed as a function of alloying element substitution. The interface characteristics are also studied using the electron charge-density distribution. It is found that the interplay between shear and cohesive strengths has a significant influence on the interfacial embrittlement. Using the phenomenological theory of fracture as well as the calculated ratio R BO , we propose a new mechanism responsible for relieving sulphur embrittlement of the ?- ?' interface through alloying substitution.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Aerospace Research; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
Identifier10414496
NPARC number12327572
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Record identifier73361dc3-37cb-48a2-a6ab-7cdd7e6dd462
Record created2009-09-10
Record modified2016-05-09
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