Journal
SCRIPTA MATERIALIA
Volume 70, Issue -, Pages 51-54Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.09.016
Keywords
Atom-probe tomography; Nickel aluminum alloys; Interfacial width; Vacancy-mediated lattice kinetic Monte Carlo simulations
Categories
Funding
- National Science Foundation
- Division of Materials Research (DMR) [1207539]
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
- National Science Foundation [DMR-1121262]
- Direct For Mathematical & Physical Scien [1207539] Funding Source: National Science Foundation
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The temporal evolution of gamma'(L1(2) structure) precipitates is studied in Ni-12.5 at.% A1 and Ni-13.4 at.% A1 alloys, aged at 823 and 873 K, utilizing three-dimensional atom-probe tomography. The values of the interfacial widths, delta(t)s, between the gamma(face-centered cubic) and gamma' phases are calculated utilizing proximity histograms. It is demonstrated that delta(t) decreases continuously with increasing aging time for both Ni-Al alloys: that is, the delta(t)s decrease with increasing mean precipitate radius, (R(t)). The ratio delta(t)/(R(t)) decreases, to first order, as (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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