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- W2092020339 abstract "The α-phase ordering in five different Cu-Al alloys during the isothermal annealing treatment is investigated. The evolution of the ordered structures during a disordered reference state is studied by the electron microscopy observations of the diffraction spots, their intensity, and intersatellite spacings. The results are interpreted in terms of the evolution from the short-to-long range ordering. The kinetics of the ordering process, studied by the electrical resistivity, show that in 11.2% Al alloys, the long range order is attained in few minutes. So, the first stage of the ordering process is studied in medium Cu-Al alloys. The results on UA 8, UA 11.2 and intermediary alloys show the transition from short-to-long range ordering. The results such as the periodicity of the structures, the evolution of the ordering, the spontaneous nature of the transformation, and the constant reversion temperature suggest that the transformations in these alloys take place according to the ordering mechanism proposed by Cook and De Fontaine. Dans la phase α de cinq alliages Cu-Al, nous avons étudié les einétiques de mise en ordre et l'évolution de la structure au cours de revenus isothermes. A partir d'un état de référence désordonné, nous observons, par microscopie électronique, une évolution de 'intensité des taches de la structure Ll2, (jusqu' à disparition complète), et de la distance intersatellite. Cela et interprété en termes d'ordre á courte et á longue distances en évolution permanente. Les cinétiques (obtenues par résistivité électrique) montrent que l'alliage á 11,2% d'Aluminium, par exemple, eat ordonné á grande distance dé s la premiè re minute de revenu. Les premiers stades de la mise en ordre sont donc analysé s par l'évolution des cinétiques et de la structure avec la teneur moyenne en Aluminium. Ainsi, en extrapolant les résultats depuie I'UA 8 jusqu' à I'UA 11,2, nous avons montré que tous les alliages étudiés présentent une transition de l'order à courte distance vem l'ordre á grande distance. Enfin, des résultats tels que la périodicité de la structure, l'évolution continue du degré d'ordre, la spontanéité de la transformation, la température de reversion (constante sur tous lea alliages), suggèrent que la transformation se fait, par le mécanisme de mise en ordre homogène proposé par Cook et De Fontaine." @default.
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- W2092020339 date "1981-07-16" @default.
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- W2092020339 title "On the kinetics of α-phase ordering in copper-aluminium alloys" @default.
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- W2092020339 doi "https://doi.org/10.1002/pssa.2210660143" @default.
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