Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy

Singh, S. ; Wanderka, N. ; Murty, B. S. ; Glatzel, U. ; Banhart, J. (2011) Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy Acta Materialia, 59 (1). pp. 182-190. ISSN 1359-6454

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.actamat.2010.09.023

Abstract

The decomposition of an equiatomic AlCoCrCuFeNi high-entropy alloy produced by splat quenching and casting was investigated by the analytical high resolution methods: transmission electron microscopy and three-dimensional atom probe. It could be shown that splat-quenched alloy consisted of an imperfectly ordered body-centred cubic phase with a domain-like structure, whereas normally cast alloy formed several phases of cubic crystal structure. The cast alloy decomposed into both dendrites and interdendrites. A detailed local compositional analysis carried out by atom probe within the dendrites revealed that the alloying elements in the Ni-Al-rich plates and Cr-Fe-rich interplates are not randomly distributed, but segregate and form areas with pronounced compositional fluctuations. Cu-rich precipitates of different morphologies (plate-like, spherical and rhombohedron-shaped) could also be found in the dendrites. The results are discussed in terms of segregation processes governed by the enthalpies of mixing of the binary systems.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:High-entropy Alloys; TEM; EDX Microanalysis; Three-dimensional Atom Probe Measurements
ID Code:73908
Deposited On:08 Dec 2011 03:56
Last Modified:08 Dec 2011 03:56

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