Characterisation of oxide scale formation on a new single crystal superalloy for power generation applications

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • University of Cambridge
  • University of Michigan, Ann Arbor.

Abstract

The oxidation behaviour at 950°C of a prototype nickel-based single crystal superalloy containing ~15 wt%Cr is studied, with and without silicon alloying. It is demonstrated that the alloy is a marginal alumina former, with further alloying by Si promoting the formation of a continuous, protective alumina scale. Transmission electron microscopy reveals that out-growing alumina forms during the early stages of oxidation. The presence of silicon within the alumina is detected using atom probe tomography.

Details

Original languageEnglish
Pages (from-to)272-278
Number of pages7
JournalMaterials at High Temperatures
Volume29
Issue number3
Publication statusPublished - 1 Aug 2012

Keywords

  • Heterogeneous nucleation of phase transformations, Kinetics, Nickel alloys, Oxidation, Superalloy