An atom probe tomography study of the oxide metal interface of an oxide intrusion ahead of a crack in a polycrystalline Ni-based superalloy

摘要

Intergranular oxide intrusions formed ahead of a crack in a Ni-based superalloy at 650 degrees C have been examined using three-dimensional atom probe tomography. Of two scans undertaken, a thin (similar to 5 non) 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 particles of TiO2. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd.