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Author(s): M. H. de Sá
I. Isomäki
J. A. Ferreira
M. Hämäläinen
M. H. Braga
Title: Experimental and First Principles Study of the Ni-Ti-W System
Issue Date: 2013
Abstract: Nickel based superalloys are structural materials with a chemical composition andstructure which has been developed to enable good high temperature performances leading to awider range of applications. Their unique properties are due to their microstructure characterized bythe coexistence of L12-ordered intermetallic precipitates like Ni3Al or Ni3Ti - phase - in a facecenteredcubic nickel based solid solution matrix, (Ni) - phase. Solid solution strengthening athigh temperatures can also be provided by the addition of refractory alloying elements, liketungsten, W. Therefore, the mechanical properties behaviour of the alloys is very strongly related totheir composition and microstructures.The purpose of this work is to study the effect of composition and microstructures in a seriesof Ni-rich prototype alloys, Ni100-2xTixWx (in which x is in at.%), in order to understand andultimately optimize the performance of these materials. The adopted strategy was to combineexperimental studies using Neutron Diffraction, Electron Probe Micro Analysis EPMA,Differential Scanning Calorimeter DSC and micro-hardness measurements, with first principlescalculations for structure optimization and Gibbs energies at different temperatures, for each phase,leading to thermodynamic assessment.
Subject: Ciências exactas e naturais
Natural sciences
Scientific areas: Ciências exactas e naturais
Natural sciences
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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