Abstract
Transmission electron microscopy (TEM) and atom probe tomography (APT) techniques were used to investigate the nano-scale ordered α2 (Ti3Al) precipitates in Ti–Al binary alloys. Ti–6Al and Ti–8Al binary alloys were solution treated and aged to obtain Widmanstatten microstructure and promote α2 precipitates. The TEM results displayed strong short-range ordering of α2 precipitates in Ti–8Al alloy, while no evidence of the superlattice reflections of α2 in Ti–6Al alloy. The results acquired from APT showed the α2 clusters and atoms distribution at the interface between the matrix and α2 precipitates. The size and morphology of α2 particles in Ti–8Al alloy, respectively, obtained by TEM and APT are closely consistent. Meanwhile, the APT results displayed tiny size clusters in Ti–6Al alloy, which supposed to give evidence of the initial ordering process of α2 precipitates in the absence of correlative results from TEM.
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