Abstract
The Al8Cr17Co17Cu8Fe17Ni33 (at.%) compositionally complex alloy is interesting for studying phase formation. It presents a high temperature single-phase γ state and a two-phase state with γ' precipitates, above and below 900°C, respectively. A combined investigation via microstructural observations, hardness testing, X-ray absorption and photoelectron spectroscopy was carried out above the γ' formation temperature: hardness increases by 15% while microstructural analysis shows no cluster formation and X-ray absorption spectroscopy does not reveal observable changes in neither local atomic nor electronic structure, indicating that hardness changes are not influenced by atomic or electronic rearrangements but rather by internal stresses.
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