Logo RUB
  • Institute
    • ICAMS
      • Mission
      • Structure
      • Members
      • Fellows
    • Departments & Research Groups
      • Atomistic Modelling and Simulation
      • Scale-Bridging Thermodynamic and Kinetic Simulation
      • Micromechanical and Macroscopic Modelling
      • Artificial Intelligence for Integrated Material Science
      • Computational Design of Functional Interfaces
      • Scale-Bridging Simulation of Functional Composites
      • Materials Informatics and Data Science
      • High-Performance Computing in Materials Science
    • Central Services
      • Coordination Office
      • IT
  • Research
    • Overview
    • Publications
    • Software and Data
    • Collaborative research
    • Research networks
    • Young enterprises
  • Teaching
    • Overview
    • Materialwissenschaft B.Sc.
    • Materials Science and Simulation M.Sc.
    • ICAMS Graduate School
    • Student Projects
  • News & Events
    • Overview
    • News
    • Seminars and Workshops
    • Conferences
  • Services
    • Overview
    • Contact
    • Open positions
    • Travel information
 
ICAMS
ICAMS
MENÜ
  • RUB-STARTSEITE
  • Institute
    • ICAMS
    • Departments & Research Groups
    • Central Services
  • Research
    • Overview
    • Publications
    • Software and Data
    • Collaborative research
    • Research networks
    • Young enterprises
  • Teaching
    • Overview
    • Materialwissenschaft B.Sc.
    • Materials Science and Simulation M.Sc.
    • ICAMS Graduate School
    • Student Projects
  • News & Events
    • Overview
    • News
    • Seminars and Workshops
    • Conferences
  • Services
    • Overview
    • Contact
    • Open positions
    • Travel information

Just another WordPress site - Ruhr-Universität Bochum

Coupling of multicomponent thermodynamic databases to a phase field model: application to solidification and solid state transformations of superalloys

U. Grafe, B. Böttger, J. Tiaden, S. Fries

Scripta Materialia, 42, 1179-1186, (2000)

DOI: 10.1016/S1359-6462(00)00355-9

Download: BibTEX

The phase field method has successfully been applied to predict microstructure evolution in metallic alloys such as dendritic solidification as well as the precipitation of coherent ordered phases from a disordered matrix taking into account the effect of elastic strain on the morphology of the precipitates [4, 5 and 6]. Recently, phase field methods employing multiple phase field parameters have been applied to eutectic and peritectic systems in dilute model systems as well as to evaluate the kinetics of solid state grain growth. In order to apply the method quantitatively to these phenomena occurring in technical alloys the method needs to be able to treat multicomponent multi-phase systems. Recently a simplified multicomponent approach using linearized phase diagrams has been applied to steels. The ternary system Fe-Al-Co has been addressed by who use real thermodynamic data within a phase field model. The main target of this work is to simulate solidification and heat treatment of technical single crystal superalloys.

The present paper proposes a multicomponent extension to a multi-phase-field model (PFM) described in employing a general method of obtaining thermodynamic data from databases being assessed according to the CALPHAD method. This method provides realistic thermodynamic descriptions for all phases present in a given material. The present model can be applied to any system if a thermodynamic database is available and is not restricted to a special formulation of the Gibbs energy. To evaluate thermodynamic quantities the FORTRAN interface of the software Thermo-Calc is used for the calculation of molar Gibbs energies and chemical potentials to calculate the driving force at the diffuse interface. Furthermore, a subroutine of the software Dictra, which is also interfaced to Thermo-Calc in order to calculate thermodynamic factors of diffusion, has been coupled to the phase field code. The subroutine calculates the diffusion matrix for given multicomponent phase from a standardized kinetic database containing data on atomic mobilities.

In order to validate the growth kinetics of this model 1D benchmark tests have been performed by comparison with a sharp interface calculation by Dictra using the same thermodynamic and kinetic database [A. Engström and J. Ågren. Z. Metallkunde. 87 2 (1996), p. 92]. of the ternary Ni-Al-Cr system. Moreover, a 2D simulation of Ostwald-ripening of spherical γ′ precipitates in a ternary Ni-Al-Cr alloy with a small γ-γ′ lattice mismatch is presented. The results are compared to experimental data by M. Doi, who determined the coarsening rate of the γ′ precipitates in a Ni-6.2 at.-% Al-18.2 at.-% Cr alloy.

back
{"type":"article", "name":"u.grafe20001", "author":"U. Grafe and B. Böttger and J. Tiaden and S. Fries", "title":"Coupling of multicomponent thermodynamic databases to a phase field model: application to solidification and solid state transformations of superalloys ", "journal":"Scripta Materialia", "volume":"42", "OPTnumber":"", "OPTmonth":"1", "year":"2000", "OPTpages":"1179-1186", "OPTnote":"", "OPTkey":"nickel; thermodynamics; microstructure; phase transformation; simulation", "DOI":"10.1016/S1359-6462(00)00355-9"}
Logo RUB
  • Open positions
  • Travel information
  • Imprint
  • Privacy Policy
  • Sitemap
Ruhr-Universität Bochum
Universitätsstraße 150
44801 Bochum

  • Open positions
  • Travel information
  • Imprint
  • Privacy Policy
  • Sitemap
Seitenanfang Kontrast N