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TEM Studies of High Temperature Corrosion Behaviour of TiAl Intermetallics with Surface Modifications
Author(s) -
Du H. L.,
Rose S. R.,
Xiang Z. D.,
Datta P. K.,
Li X. Y.
Publication year - 2003
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200390087
Subject(s) - materials science , intermetallic , coating , metallurgy , corrosion , diffusion , alloy , substrate (aquarium) , high temperature corrosion , composite material , geology , oceanography , physics , thermodynamics
The oxidation/sulphidation behaviour of a Ti‐46.7Al‐1.9W‐0.5Si alloy with a TiAl 3 diffusion coating was studied in an environment of H 2 /H 2 S/H 2 O at 850 o C. The kinetic results demonstrate that the TiAl 3 coating significantly increased the high temperature corrosion resistance of Ti‐46.7Al‐1.9W‐0.5Si. The SEM, EDX, XRD and TEM analysis reveals that the formation of an Al 2 O 3 scale on the surface of the TiAl 3 ‐coated sample was responsible for the enhancement of the corroison resistance. The Ti‐46.7Al‐1.9W‐0.5Si alloy was also modified by Nb ion implantation. The Nb ion implanted and as received sampels were subjected to cyclic oxidation in an open air at 800 o C. The Nb ion implantation not only increased the oxidation resistance but also substantially improved the adhesion of scale to the substrate.