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

H.S Kitaguchi,M.P Moody,H.Y Li,H.E Evans,M.C Hardy,S Lozano-Perez

doi:10.1016/j.scriptamat.2014.10.025

H.S Kitaguchi, M.P Moody + Show 4 more

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https://doi.org/10.1016/j.scriptamat.2014.10.025

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Abstract

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 (∼5 nm) 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 TiO 2 .

Highlights

An atom probe tomography study of the oxide–metal interface of an oxide intrusion ahead of a crack in a polycrystalline Ni-based superalloy
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These are exposed to oxidizing conditions and stress at operating temperatures in the range 500–700 °C and, clearly, the role of oxidation on crack propagation rates is an important aspect

Summary

Introduction

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

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