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- W1985109039 abstract "The early stages of spinodal decomposition in age hardening Cu-Ti alloys have been studied by electron microscopy. The alloys (1.55, 3.08 and 5.17 w/o Ti) decomposed on the quench from solutionizing temperatures into Ti enriched and Ti lean regions. Superlattice reflections, at 15{420}m positions as well as 12{210}m reflections were observed in the diffraction patterns of the as quenched 5.17 w/o Ti alloy. The alloys continued to decompose when aged at elevated temperatures. A sequence of microstructures was used to show that continuous phase separation, and hence spinodal decomposition, was the mechanism of decomposition. The metastable two phase structure which formed from the spinodal process was aligned and periodic from the start of the process. The Ti enriched phase was ordered, with the Dla(Ni4Mo; 14/m) structure. Reversion experiments were performed to determine the position of the coherent metastable solvus. When aging treatments were performed near this solvus. heterogeneous nucleation of the metastable phase was observed. On a étudié en microscopic électronique les premiers stades de la décomposition spinodale des alliages Cu-Ti dureis par vieillissement. Les alliages (1,55, 3,08 et 5,17% Ti en poids) se décomposent par trempe à partir des températures de la solution solide en régions riches et en régions pauvres en titane. Des réflexions de surstructure, aux positions 15{420}m et 12{210}m, sont observées dans les diagrammes de diffraction de l'alliage à 5,17% en poids brut de trempe. Les alliages continuent de se décomposer si on les vieillit à hautes températures. Un série de micrographies montre que le mécanisme de la décomposition est une séparation continue des phases, et done le processus de décomposition spinodale. La structure diphasique métastable qui se forme par le mécanisme de décomposition spinodale est alignée et périodique dès le début du processus. La phase riche en Ti était ordonnée, avec la structure Dla(Ni4Mo; 14/m). Des expériences de réversion ont été faites pour déterminer la position du solvus cohérent métastable. Lorsque le vieillissement est fait au voisinage de ce solvus, on observe une germination hétérogène de la phase ordonnée métastable. Die Anfangsstadien der spinodalen Entmischung in gealterten Cu-Ti-Legierungen wurden elektronenmikroskopisch untersucht. Die Legierungen (1,55, 3,08 und 5,17 w/o Ti) entmischen sich beim Abschrecken von der Lösungstemperatur in Ti-reiche und Ti-arme Bereiche. In den Beugungsbildern der abgeschreckten 5,17 w/o Ti-Legierung beobachtet man bei 12{210}m und 15{420}m Überstrukturreflexe. Die Legierungen entmischen sich weiter beim Altern bei höheren Temperaturen. Mit Hilfe einer Reihe verschiedener MikroStrukturen wurde gezeigt, daβ kontinuierliche Phasentrennung und somit spinodale Entmischung als Entmischungsmechanismus wirken. Die in diesem spinodalen Prozeβ gebildete metastabile Zweiphasenstruktur ist von Prozeβbeginn an ausgerichtet und periodisch. Die Ti-reiche Phase ist geordnet und besitzt Dla(Ni4Mo; 14/m)-Struktur. Mit Hilfe von Reversionsexperimenten wurde die Lage des kohärenten metastabilen Solvus bestimmt. Führt man in der Nähe dieses Solvus Alterungsbehandlungen durch, so beobachtet man eine heterogene Keimbildung der metastabilen Phase." @default.
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- W1985109039 date "1975-03-01" @default.
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- W1985109039 title "Spinodal decomposition in age hardening copper-titanium alloys" @default.
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- W1985109039 doi "https://doi.org/10.1016/0001-6160(75)90125-x" @default.
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