TY  - JOUR
AU  - Amouyal, Yaron
AU  - Mao, Zugang
AU  - Seidman, David N.
PY  - 2009//
TI  - 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
JO  - Applied Physics Letters
SP  - 161909
VL  - 95
IS  - 16
PB  - Aip
KW  - ab initio calculations
KW  - aluminium alloys
KW  - atom probe field ion microscopy
KW  - binding energy
KW  - hafnium alloys
KW  - nickel alloys
KW  - phase diagrams
KW  - superalloys
KW  - tomography
AB  - 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.
UR  - http://link.aip.org/link/?APL/95/161909/1
UR  - http://arc.nucapt.northwestern.edu/refbase/files/Amouyal-2009_10700.pdf
N1  - exported from refbase (http://arc.nucapt.northwestern.edu/refbase/show.php?record=10700), last updated on Mon, 26 Oct 2009 17:18:40 -0500
ID  - Amouyal-2009
ER  -