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Author (up) Amouyal, Yaron; Mao, Zugang; Seidman, David N. pdf  url
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  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 Type Journal Article
  Year 2009 Publication Applied Physics Letters Abbreviated Journal  
  Volume 95 Issue 16 Pages 161909  
  Keywords ab initio calculations; aluminium alloys; atom probe field ion microscopy; binding energy; hafnium alloys; nickel alloys; phase diagrams; superalloys; 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–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.  
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  Call Number NU @ m-krug @ amouyal:161909 Serial 10700  
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