Abstract
Compositionally complex alloy Al10CO25Cr8Fe15Ni36Ti6 and its modifications with trace elements Mo and Hf are compared in terms of their γ/γ' microstructure. The trace elements sharpen (Hf) or soften (Mo) the edges of the γ' cuboids without changing their sizes. Atom probe measurements revealed that the Hf alloy prefers the γ' phase while Mo prefers the γ matrix, leading to a lattice parameters enhancement of both phases, as could be revealed by synchrotron X-ray diffraction. The misfit is influenced in opposite ways: Hf increases the positive misfit, while Mo reduces it at all investigated temperatures from room temperature up to 980°C.
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