Paper Title:
Microstructural Characterization of Silicon Added Titanium Aluminide
  Abstract

Titanium aluminides intermetallic compounds have received great attention during the past decade, since they have the potential, in aircraft and automotive engines, to replace the high density Ni-base superalloys However, these intermetallics possess poor oxidation properties at high temperatures. Previous studies showed that protective alumina scale formation on γ-TiAl can be obtained by small additions (around 2 at.%) of Ag. In the present study, a number of cast Ti–Al–Si alloys were investigated in relation to transient oxide formation in air at 1300°C. After various oxidation times the oxide composition, microstructure and morphology were studied by combining a number of analysis techniques. The TiAl–Si alloys appear to form Al Ti and Si oxides. However, the formation of silicon oxide at the interface of base metal and scale slows down the oxidation rate significantly.

  Info
Periodical
Edited by
Shaheed Khan, Iftikhar us Salam and Karim Ahmed
Pages
74-80
DOI
10.4028/www.scientific.net/KEM.442.74
Citation
A. N. Khan, "Microstructural Characterization of Silicon Added Titanium Aluminide", Key Engineering Materials, Vol. 442, pp. 74-80, 2010
Online since
June 2010
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$32.00
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