MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
High Temperature Oxidation of Ti-(45, 47)%Al-2%Mn-2%Nb-0.8 vol%TiB2 Alloys
Dong-Bok LeeWoung-Shik ShimDong-Yi Seo
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2002 Volume 43 Issue 10 Pages 2527-2530

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Abstract

The oxidation behavior of XD45 (Ti45Al2Mn2Nb–0.8 vol%TiB2) and XD47 (Ti47Al2Mn2Nb-0.8 vol%TiB2) alloys that were thermomechanically treated to have (γ+α2) duplex microstructures was studied between 1073 and 1273 K in air. XD47 displayed a little slower oxidation rate and better scale adherence than XD45. The oxide scales consisted primarily of an outer TiO2 layer, an intermediate Al2O3-rich layer, and an inner (TiO2+Al2O3) mixed layer. Mn and Nb tended to segregate at the outer TiO2 layer and the inner (TiO2+Al2O3) mixed layer, respectively. The outer layer grew primarily by the outward diffusion of Ti and Mn, and the inner mixed layer by the inward transport of oxygen. Dispersoids of TiB2 oxidized to semiprotective TiO2 and highly volatile B2O3 which evaporated. A small amount of TiN and Ti2AlN formed during oxidation.

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© 2002 The Japan Institute of Metals and Materials
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