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conference

Materials design based on ab initio thermodynamics: Development of accurate and efficient multiscale strategies

Jörg Neugebauer, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany

Blazej Grabowski, , Düsseldorf, Germany

Fritz Körmann, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany

Alexey Dick, , Düsseldorf, Germany

Martin Friák, MPIE Max Planck Institut für Eisenforschung GmbH, Düsseldorf, Germany

Tilmann Hickel, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany

Time & Place
  • Date: 15.09.2010
  • Time:
  • Place: Ψk (Psi-k) Conference 2010, Berlin, Germany

Abstract


The combination of accurate first principles calculations with mesoscopic/macroscopic thermodynamic and/or kinetic concepts has quickly advanced in the past few years and allows now to tackle even complex engineering systems such as polycrystals or steels. Key to these studies is the highly accurate determination of free energies and surfaces. In the first part of the talk it will be shown how efficient sampling strategies together with high convergence density functional theory calculations allow an accurate determination of all relevant temperature dependent free energy contributions such as electronic, harmonic, anharmonic, magnetic and structural excitations. Using these results to construct coarse grained models stability issues and mechanical properties of various alloys have been computed. The flexibility and the predictive power of this approach will be discussed in the second part of the talk for a few examples: Martensitic transitions in magnetic shape memory alloys, the design of novel light weight alloys, failure mechanisms in novel steels and unraveling design principles in biological structural materials.

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