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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
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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DOI (Published version): 10.1016/j.jallcom.2020.155496
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...
|Published in:||Journal of Alloys and Compounds|
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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.
High entropy alloys, Multicomponent, Structure, Phases, Calorimetry, e/a
Faculty of Science and Engineering