@Article{Amouyal-2009,
author="Amouyal, Yaron
and Mao, Zugang
and Seidman, David N.",
title="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",
journal="Applied Physics Letters",
year="2009",
publisher="Aip",
volume="95",
number="16",
pages="161909",
optkeywords="ab initio calculations",
optkeywords="aluminium alloys",
optkeywords="atom probe field ion microscopy",
optkeywords="binding energy",
optkeywords="hafnium alloys",
optkeywords="nickel alloys",
optkeywords="phase diagrams",
optkeywords="superalloys",
optkeywords="tomography",
abstract="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{\textendash}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.",
optnote="exported from refbase (http://arc.nucapt.northwestern.edu/refbase/show.php?record=10700), last updated on Mon, 26 Oct 2009 17:18:40 -0500",
doi="10.1063/1.3248146",
opturl="http://link.aip.org/link/?APL/95/161909/1",
opturl="http://arc.nucapt.northwestern.edu/refbase/files/Amouyal-2009_10700.pdf"
}