%0 Journal Article
%T Phase partitioning and site-preference of hafnium in the gamma[sup [prime]](L1[sub 2])/ gamma(fcc) system in Ni-based superalloys: An atom-probe tomographic and first-principles study
%A Amouyal, Yaron
%A Mao, Zugang
%A Seidman, David N.
%J Applied Physics Letters
%D 2009
%V 95
%N 16
%I Aip
%F Amouyal-2009
%O exported from refbase (http://arc.nucapt.northwestern.edu/refbase/show.php?record=10700), last updated on Mon, 26 Oct 2009 17:18:40 -0500
%X Atom-probe tomography (APT) and first-principles calculations are employed to investigate the partitioning of Hf in the gamma[prime](L12)/gamma(fcc) phases in two multicomponent Ni-based superalloys. APT results indicate strong partitioning of Hf atoms to the gamma(fcc)-phase. We perform first-principles calculations of the substitutional formation energy of Hf for a model gamma(Ni)/gamma[prime](Ni3Al) system indicating Hf partitioning to the gamma[prime]-phase. Additional calculations of the Hf–Cr binding energy suggest, however, that Cr atoms, which partition to the gamma-phase, have a strong attractive binding energy with Hf atoms, thus predicting a reversal of the Hf partitioning in favor of the gamma-phase due to alloying with Cr.
%K ab initio calculations
%K aluminium alloys
%K atom probe field ion microscopy
%K binding energy
%K hafnium alloys
%K nickel alloys
%K phase diagrams
%K superalloys
%K tomography
%U http://link.aip.org/link/?APL/95/161909/1
%U http://arc.nucapt.northwestern.edu/refbase/files/Amouyal-2009_10700.pdf
%P 161909