Phase separation in equiatomic AlCoCrFeNi high-entropy alloy

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Manzoni, Anna M. ; Daoud, Haneen ; Völkl, Rainer ; Glatzel, Uwe ; Wanderka, Nelia:
Phase separation in equiatomic AlCoCrFeNi high-entropy alloy.
In: Ultramicroscopy. Bd. 132 (2013) . - S. 212-215.
ISSN 0304-3991
DOI: https://doi.org/10.1016/j.ultramic.2012.12.015

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Abstract

The microstructure of the as-cast AlCoCrFeNi high entropy alloy has been investigated by transmission electron microscopy and atom probe tomography. The alloy shows a very pronounced microstructure with clearly distinguishable dendrites and interdendrites. In both regions a separation into an Al-Ni rich matrix and Cr-Fe-rich precipitates can be observed. Moreover, fluctuations of single elements within the Cr-Fe rich phase have been singled out by three dimensional atom probe measurements. The results of investigations are discussed in terms of spinodal decomposition of the alloying elements inside the Cr-Fe-rich precipitates.