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Lecture

Grain Boundary Mobility in the High Entropy Alloys - Insights from Atomistic Computer Simulations

Wednesday (26.09.2018)
15:30 - 15:45 S1/01 - A5
Part of:


High-entropy alloys (HEAs) commonly are single-phase mixtures of

multiple elements in high concentrations without secondary phase

formation. Experimentally, some high entropy alloys are found to be

more resilient against grain growth than conventional nanocrystalline

metals and alloys, but the origins of the stabilization are still

unclear. Using atomistic modelling and simulations we investigate the

role of different effects on grain growth and grain boundary mobility

in HEAs, including local chemical disorder and grain boundary

segregation.


To assess the influence of the chemical disorder on the grain boundary

mobility and migration mechanisms, we compare the simulated grain

growth behavior of nanocrystalline high entropy samples to pure

nanocrystalline metals as well as an artificial, effective medium

material, which possesses the same average properties as the HEA

matrix, but is lacking the local chemical disorder. This approach

allows us to separate mixing effects from effects associated with the

atomic disorder.

Speaker:
Daniel Utt
Technische Universität Darmstadt
Additional Authors:
  • Dr. Alexander Stukowski
    Technische Universität Darmstadt
  • Prof. Dr. Karsten Albe
    Technische Universität Darmstadt