MSE 2016 - Full Program

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Lecture

Thermodynamics and kinetics of precipitate formation in the Al-Sc system

Wednesday (28.09.2016)
15:45 - 16:00
Part of:


Al-Sc alloys are promising light-weight materials that possess excellent mechanical properties. These properties critically depend on the size and distribution of Al3Sc particles that precipitate out from a Sc supersaturated solid solution. In this work we investigate the thermodynamics and kinetics of these precipitates, which are both crucial to understanding their structure and stability. We address the thermodynamic properties of Al3Sc by including all the relevant finite-temperature contributions in a first-principles approach. In particular, we address the experimentally observed low-temperature phenomena in the heat capacity, such as the importance of electronic excitations and the origin of a boson peak in the vibrational contributions. The precipitation kinetics is studied in terms of fully atomistically derived time-temperature-transformation (TTT) diagrams employing kinetic Monte-Carlo simulations. The derived features in the TTT diagrams can be used to design processing routes that tailor the size of precipitates in Al-Sc alloys.

Speaker:
Ankit Gupta
Max-Planck-Institut für Eisenforschung GmbH
Additional Authors:
  • Bengü Tas-Kavakbasi
    Institut für Materialphysik, Westfälische Wilhelms-Universität Münster
  • Dr. Biswanath Dutta
    Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf
  • Dr. Tilmann Hickel
    Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf
  • Dr. Sergiy V. Divinski
    Institut für Materialphysik, Westfälische Wilhelms-Universität Münster
  • Prof. Gerhard Wilde
    Institut für Materialphysik, Westfälische Wilhelms-Universität Münster
  • Prof. Dr. Jörg Neugebauer
    Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf