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Intergranular oxide intrusions formed ahead of a crack in a Ni-based superalloy at 650°C have been examined using three-dimensional atom probe tomography. Of two scans undertaken, a thin (∼5nm) alumina layer was observed next to the alloy substrate in one, overlaid by a chromia layer. In the second, chromia penetrated to the alloy interface. The chromia layer contained Ti in solution as well as discrete...
Oxide intrusions which formed ahead of the crack tip in an advanced nickel-based superalloy after exposure to air at 650°C have been investigated by (scanning) transmission electron microscopy equipped with energy-dispersive X-ray spectrometry. Three different cases were considered: (i) a fast growing crack; (ii) a stationary crack exposed to a 5h period under load; and (iii) a stationary crack exposed...
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