Phase separation in equiatomic AlCoCrFeNi high-entropy alloy
2012; Elsevier BV; Volume: 132; Linguagem: Inglês
10.1016/j.ultramic.2012.12.015
ISSN1879-2723
AutoresAnna M. Manzoni, Haneen Daoud, Rainer Völkl, Uwe Glatzel, N. Wanderka,
Tópico(s)High-Temperature Coating Behaviors
ResumoThe 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.
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