Experimental and First Principles Study of the Ni-Ti-W System

M.H. De Sa, I. Isomäki, J.A. Ferreira, Mikko Hämäläinen, M.H. Braga

    Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference article in proceedingsScientificvertaisarvioitu

    4 Sitaatiot (Scopus)

    Abstrakti

    Nickel based superalloys are structural materials with a chemical composition and structure which has been developed to enable good high temperature performances leading to a wider range of applications. Their unique properties are due to their microstructure characterized by the coexistence of L1(2)-ordered intermetallic precipitates like Ni3Al or Ni3Ti - gamma' phase - in a face-centered cubic nickel based solid solution matrix, (Ni) - gamma phase. Solid solution strengthening at high temperatures can also be provided by the addition of refractory alloying elements, like tungsten, W. Therefore, the mechanical properties behaviour of the alloys is very strongly related to their composition and microstructures.

    The purpose of this work is to study the effect of composition and microstructures in a series of Ni-rich prototype alloys, Ni100-2x-Ti-x-W-x (in which x is in at.%), in order to understand and ultimately optimize the performance of these materials. The adopted strategy was to combine experimental studies using Neutron Diffraction, Electron Probe Micro Analysis - EPMA, Differential Scanning Calorimeter - DSC and micro-hardness measurements, with first principles calculations for structure optimization and Gibbs energies at different temperatures, for each phase, leading to thermodynamic assessment.

    AlkuperäiskieliEnglanti
    OtsikkoADVANCED MATERIALS FORUM VI, PTS 1 AND 2
    ToimittajatAMP Pinto, AS Pouzada
    KustantajaTrans Tech Publications
    Sivut775-780
    DOI - pysyväislinkit
    TilaJulkaistu - 2013
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
    TapahtumaInternational Materials Symposium / 15th Meeting of SPM - Guimaraes, Portugali
    Kesto: 18 huhtik. 201120 huhtik. 2011
    Konferenssinumero: 6

    Julkaisusarja

    NimiMaterials Science Forum
    KustantajaTRANS TECH PUBLICATIONS LTD
    Vuosikerta730-732
    ISSN (painettu)0255-5476

    Conference

    ConferenceInternational Materials Symposium / 15th Meeting of SPM
    LyhennettäMATERIALS
    Maa/AluePortugali
    KaupunkiGuimaraes
    Ajanjakso18/04/201120/04/2011

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