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Temperature Evolution of Lattice Misfit in Variations of the Al 10CO 25Cr 8Fe 15Ni 36Ti 6 Compositionally Complex Alloy

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Document pages: 15 pages

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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