Phase evolution of Al0.5CrFeCoNiCu exposed 700–900 °C for 0.1–1000 h studied.
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Three different populations of Ni–Al based B2 phase observed, all form quickly.
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Cr-rich sigma phase formed more slowly, adjacent to intergranular B2 precipitates.
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A time-temperature-transformation diagram for Al0.5CrFeCoNiCu is plotted.
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