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.
['Manzoni|A|A|', 'Daoud|H|H|', 'Völkl|R|R|', 'Glatzel|U|U|', 'Wanderka|N|N|']
Phase separation High entropy alloys Atom probe tomography Spinodal decomposition