Oxidation behavior of titanium aluminides of high niobium content

Authors
Mungole, MN Balasubramaniam, R Ghosh, A
Citation
Mn. Mungole et al., Oxidation behavior of titanium aluminides of high niobium content, INTERMETALL, 8(7), 2000, pp. 717-720
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
INTERMETALLICS
ISSN journal
09669795 → ACNP
Volume
8
Issue
7
Year of publication
2000
Pages
717 - 720
Database
ISI
SICI code
0966-9795(200007)8:7<717:OBOTAO>2.0.ZU;2-I
Abstract
The oxidation behaviour of two titanium aluminides of composition Ti-24Al-2 0Nb and Ti-24Al-27Nb were studied in oxygen in the range 1125-1325 K. The p arabolic rate constants of the alloys in the present investigation were hig her than that of titanium aluminides of lower Nb content [Ti-24Al-11Nb and Ti-24Al-15Nb (Roy TK, Balasubramaniam R, Ghosh A. Metall Mater Trans A 1996 ;27A:3993)]. The major constituent of the oxides was TiO2 while Nb2O5 and A l2O3 were the minor constituents. The formation of Nb2O5 as a separate phas e is possibly related to the lower oxidation resistance of these alloys com pared to titanium aluminides of lower Nb content. (C) 2000 Elsevier Science Ltd. All rights reserved.