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 N3M phase was observed for the first time in this work. This disappeared on prolonged ageing giving rise to the metastable Cu4Ti (D1a). © 2003 Elsevier B.V. All rights reserved.
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