Calculated phase diagram of the Ni–Mo–B ternary system

Local order in industrial and model γ phases of superalloys

Formation of lamellar microstructures in Al-rich TiAl alloys between 900 and 1100°C

Although it is well established that dilute Cu–Ti alloys with titanium in the range of 2.5–5 wt.% decompose by a spinodal mechanism, the sequence of ordering and clustering processes in the early stages has been a matter of controversy. An attempt has been made in this work to resolve some of the issues by carrying out transmission electron microscopy (TEM) investigations on a dilute meltspun Cu–Ti alloy. Decomposition was studied as a function of ageing over a temperature range of 573–723 K. The results seem to suggest that clustering precedes the formation of long range ordered (LRO) phases in this alloy. Formation of a transitory special point N 3 M phase was observed for the first time in this work. This disappeared on prolonged ageing giving rise to the metastable Cu 4 Ti (D1 a ).

On the sequence of clustering and ordering in a meltspun Cu–Ti alloy

Novel ordering transitions in off-stoichiometric γ-TiAl intermetallics and the similarities between these and the special point ordering processes in Ni-Mo alloys

The nature of the short range ordered (SRO) state and the mechanism of evolution of the long range ordered (LRO) structure in the NiMo system are subjects of considerable controversy. Attempts are made to simulate the state of SRO and the transitional states between SRO and LRO at the atomistic level. The two descriptions of the SRO state, namely, the concentration wave model and the cluster model are discussed in the light of the results of the present simulation.



Die Natur des nahgeordneten (SRO) Zustandes und der Mechanismus der Entwicklung von ferngeordneten (LRO) Strukturen im System NiMo sind derzeit Gegenstand einer Kontroverse. Es wird ein Versuch unternommen, auf atomistischer Ebene den Nahordnungszustand und die Ubergangszustande zu simulieren, die beim Ubergang von Nahordnung zur Fernordnung auftreten konnen. Elektronenbeugungsdiagramme werden berechnet und mit experimentellen Aufnahmen verglichen. Zwei Beschreibungen des nahgeordneten Zustandes, namlich das Konzentrationswellen-Modell und das Cluster-Modell, werden im Rahmen der Ergebnisse dieser Untersuchungen diskutiert.

Computer simulation of the early stages of ordering in NiMo alloys

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Computer simulation of the early stages of ordering in NiMo alloys