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- W2092201306 abstract "The early stage of phase decomposition of an Al-7.8at.% Li alloy was studied by atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). The atom probe concentration depht profile clearly that the δ′ with the stoichiometric Li concentration were already precipitated in the as-quenched stage. The high resolution TEM image also showed that small isolated ordered particles were present in the disordered matrix. These two results unambiguously show that the first product which we can observe experimentally is the δ′ precipitates. Therefore, it does not seem possible to obtain convincing evidence to prove that the congruent ordering precedes spinodal decomposition, because such a transformation path would have already been completed during quenching. Onétudie les premiers stades de la décomposition de phase d'un alliage Al-7,8 at.% Li par microscopie ioniqueàémission de champ et sonde atomique, et par microscopieélectronique par transmission. Le profil de concentration en profondeur de la sonde atomiquemontre clairement que la phase δ′ avec une concentration stoechiométrique en Li précipite déj`a au stade de la trempe. Les images de microscopieélectronique en haute résolution montrent que de petites particules ordonnées isolées sont présentes dans la matrice désordonnée. Ces deux résultats montrent sans ambiguïtéque les premiers produits que l'on peut observer expérimentalement sont les précipités δ′. Donc, il ne semble pas possible de prouver d'une manière certaine que l'ordre congruent précède la décomposition spinodale, car une telle transformation serait déjàtotale au cours de la trempe. Das frühe Stadium der Phasenentmischung der Legierung Al-7,8 At.% Li wird mit der Atomsonde und dem Durchsrahlungselektronenmikroskop untersucht. Die Konzentrations- Tiefen-profile der Atomsonde zeigen klar, daß die δ′-Phase mit der stöchiometrischen Li-Konzentration schon im frisch abgeschreckten Zustand ausgeschieden ist. Die hochauflösende Elektronenmikroskopie zeigt ebenfalls, daß kleine isolierte geordnete Teilchen in der entordneten Matrix vorliegen. Diese beiden Ergebnisse zeigen eindeutig, daß die erste Phase, die beobachtet werden kann, die δ′-Ausscheidungen sind. Daher scheint es nicht möglich zu sein, den Beweis dafür zu erbringen, daß kongruente Ordnungseinstellung der spinodalen Entmischung vorausgeht, da ein solcher Umwandlungsweg schon während des Abschreckens durchlaufen worden wäre." @default.
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- W2092201306 date "1992-11-01" @default.
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- W2092201306 title "Atom probe study of early stage phase decomposition in an Al-7.8 at.% Li alloy" @default.
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- W2092201306 doi "https://doi.org/10.1016/0956-7151(92)90466-r" @default.
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