Grain boundary mobilities in polycrystals

Jin Zhang, Wolfgang Ludwig, Yubin Zhang, Hans Henrik B. Sørensen, David J. Rowenhorst, Akinori Yamanaka, Peter W. Voorhees, Henning F. Poulsen*

*Corresponding author for this work

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Abstract

Most metals, ceramics, semiconductors and rocks are composed of small crystals known as grains. When annealed, this polycrystalline structure coarsens, thus allowing the properties of a material to be tailored for a particular application. The mobility of grain boundaries is thought to be determined by the crystallography of the adjacent crystals, but experimental validation in bulk polycrystalline materials is lacking. Here we developed a novel fitting methodology by direct comparison of a time-resolved three-dimensional experimental data to simulations of the evolution of 1501 grains in iron. The comparison allows reduced mobilities of 1619 grain boundaries to be determined simultaneously. We find that the reduced mobilities vary by three orders of magnitude and in general exhibit no correlation with the boundary's five macroscopic degrees of freedom, implying that grain growth is governed by other factors.

Original languageEnglish
JournalActa Materialia
Volume191
Pages (from-to)211-220
ISSN1359-6454
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • Ferrite
  • Grain growth
  • Microstructure
  • Phase field
  • X-ray synchrotron radiation

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