Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3026745
Keywords
aluminium alloys; carbon; chromium alloys; cobalt alloys; density functional theory; free energy; hafnium alloys; molybdenum alloys; nickel alloys; rhenium alloys; segregation; surface energy; tantalum alloys; tomography
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Funding
- MEANS II AFOSR [FA9550-05-1-0089]
- NSF-MRI
- ONR-DURIP
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0804610] Funding Source: National Science Foundation
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gamma(fcc)/gamma(')(L1(2)) heterophase interfaces in a Ni-based superalloy are investigated using atom-probe tomography and first-principles calculations. Flat {100} interfaces exhibit a confined (nonmonotonic) Gibbsian interfacial excess of tungsten, Gamma(W)=1.2 +/- 0.2 nm(-2), corresponding to a 5 mJ m(-2) decrease in interfacial free energy. Conversely, no measurable segregation of W is detected at curved interfaces. First-principles calculations for a Ni-Al-W system having a {100} interface indicate a decrease in the interfacial energy of 5 mJ m(-2) due to W segregation. Similar calculations for {110} and {111} interfaces predict an increase of 1 and 9 mJ m(-2) in their energies, respectively, and therefore no heterophase segregation.
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