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Abstract

The influence of Nb added by alloying and ion implantation on the high temperature oxidation behaviour of near gamma Ti-48Al-2Cr was investigated. Oxidation experiments under isothermal and cyclic conditions at 800 C in air revealed that Nb improves the oxidation resistance as well as the scale adherence. Nb does not change fundamentally the corrosion mechanism itself and it could be demonstrated that the often suggested doping mechanism of the titania lattice by Nb(5+) ions cannot play an important role to explain the beneficial effect of niobium.
Using two-stage oxidation experiments with (16)O/(14)N and (18)O/(15)N, some mechanistic aspects were discussed in relation to the formation and existence of a nitride containing layer at the scale/metal interface.

Additional information

Authors: SUNDERKÖTTER J D, JRC Ispra (IT);HAANAPPEL V A C, JRC Ispra (IT);STROOSNIJDER M F, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 3rd International Conference on the Microscopy of Oxidation, Cambridge (GB), September 16-18, 1996
Availability: Available from (1) as Paper EN 40223 ORA
Record Number: 199710009 / Last updated on: 1997-02-03
Category: PUBLICATION
Original language: en
Available languages: en