Phase separation in equiatomic AlCoCrFeNi high-entropy alloy.
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.
Helmholtz-Zentrum Berlin, Institute of Applied Materials, D-14109 Berlin, Germany. Electronic address: anna.manzoni@helmholtz-berlin.de.
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A
Manzoni
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H
Daoud
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R
Völkl
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U
Glatzel
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N
Wanderka
Atom probe tomography; High entropy alloys; Phase separation; Spinodal decomposition