Structural investigation of the stability in temperature of some high entropy alloys as a function of their electronic structure

High Entropy Alloys (HEA) can be classified in three domains according to their e/a and r values, with e/a, the number of itinerant valence electrons and r the average radius for a 12 nearest atoms neighborhood. The phase composition, thermal stability and possible phase transformations of a series...

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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 837
Main Authors:	Calvo-Dahlborg, M., Dahlborg, U., Cornide, J., Mehraban, S., Leong, Z., Hansen, T.C. C, Wunderlich, R.K. K, Goodall, R., Lavery, N.P. P, Brown, S.G.R. G R
Format:	Journal Article
Language:	English
Published:	Elsevier 01-10-2020
Subjects:	Chemical Sciences Condensed Matter Cristallography Disordered Systems and Neural Networks Material chemistry Materials Science Physics calorimetry High Entropy Alloys multicomponent structure phases e/a 2
Online Access:	Get full text
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Summary:	High Entropy Alloys (HEA) can be classified in three domains according to their e/a and r values, with e/a, the number of itinerant valence electrons and r the average radius for a 12 nearest atoms neighborhood. The phase composition, thermal stability and possible phase transformations of a series of HEA alloys, CoCrzFeNi-XY (with X and Y = Al, Cu, Pd, Ru, Ti and z=0 or 1), selected according to their e/a ratio were investigated in cast conditions (T0), after 3 hours homogenization at 1100°C (T1) and after 3 hours annealing at 700°C (T3). It is observed that for the alloys from domain I which contains fcc structures, the microstructure transforms from multi-to almost single-phase under homogenization (T1). In domain III alloys contains cubic (bcc and/or B2) structures very small multi-structural changes are observed. Alloys in domain II have mixed structure, i.e. several different structures in the diffraction pattern, which changes during heat treatments.
ISSN:	0925-8388
DOI:	10.1016/j.jallcom.2020.155496