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Influence of Si and W Additions on High Temperature Oxidation of γ-α2 Ti-Al Alloys

Published online by Cambridge University Press:  15 February 2011

A. Tomasi ,
C. Noseda ,
M. Nazmy  and
S. Gialanella
A. Tomasi
Affiliation:
Centra Materiali e Biofisica Medica, 38050, Povo, Trento, Italy, [email protected].
C. Noseda
Affiliation:
Rensselaer Polytech. Inst., Dept. Mat. Sci. and Eng., Troy, NY 12180–3590, USA
M. Nazmy
Affiliation:
ABB Power Genaration Ltd, CH 5401, Baden, Switzerland.
S. Gialanella
Affiliation:
Dip. to di Ingegneria dei Materiali, Università di Trento, 38050, Mesiano, Trento, Italy.
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Abstract

Titanium aluminides have potential interest for high temperature applications because of their low density and high temperature strength. In this study the isothermal oxidation behavior in air and in the temperature range 700–850°C of γ-α2Ti-Al bulk alloys with different additions of W (0–9.5 wt.%) and Si (0–5.0 wt.%) was investigated. The samples were prepared by arc-melting starting from pure element powders (99.99%). After thermal treatments, for homogenisation and phase stabilisation, the samples were tested using a thermal analysis apparatus in order to evaluate their oxidation resistance. The oxidation rates show the beneficial effect of the W and Si additions. The growth and adherence of the protective scale on alloys have been investigated in conjunction with detailed oxide scale characterisation using the techniques of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results of the study are used for critical assessment of the oxidation mechanisms leading to the formation of surface layers of different compositions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 225
Copyright
Copyright © Materials Research Society 1997

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