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Structural investigation of the stability in temperature of some high entropy / multi major components alloys as a function of their electronic structure / Monique Calvo-Dahlborg, Ulf Dahlborg, J. Cornide, Shahin Mehraban, Z. Leong, T.C. Hansen, R.K. Wunderlich, R. Goodall, Nicholas Lavery, Steve Brown

Journal of Alloys and Compounds, Volume: 837, Start page: 155496

Swansea University Authors: Monique Calvo-Dahlborg, Ulf Dahlborg, Shahin Mehraban, Nicholas Lavery, Steve Brown

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Abstract

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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Published in: Journal of Alloys and Compounds
ISSN: 0925-8388
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54200
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Abstract: 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 h homogenization at 1100 °C (T1) and after 3 h annealing at 700 °C (T3). When observing the behavior of the different Domains of HEAs as classified by electronic structure it is observed that for the alloys from Domain I which contain fcc structures, the microstructure transforms from multi-to almost single-phase under homogenization (T1). In Domain III alloys containing cubic (bcc and/or B2) structures, very small multi-structural changes are observed. Alloys in Domain II have a mixed structure, i.e. several different structures in the diffraction pattern, which changes during heat treatments.
Keywords: High entropy alloys, Multicomponent, Structure, Phases, Calorimetry, e/a
College: College of Engineering
Start Page: 155496