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The effect of various elements added by ion implantation on the isothermal (up to 150 h) and cyclic (up to 1500 h) oxidation behaviour of y-TiAl-based intermetallics at 800 degrees Celsius in air is discussed.

Ion implantation of Si, Nb, Ta, W, and Al showed a large beneficial effect on the isothermal oxidation behaviour of Ti-48Al-2Cr. Similar results of these implanted elements were found during the initial period of the cyclic oxidation experiments. For longer exposure times under cyclic oxidation conditions the corrosion scale formed on the Al- and Si-implanted specimens were especially prone to spallation. A minor positive effect was found for Ti, Mo, Y, Mn, and Cr. Oxidation of the specimens implanted with Si or Nb revealed similar results as found for the intermetallics alloyed with these elements.

Furthermore, it is concluded that care should be taken when studying the cyclic corrosion damage of implanted specimens by gravimetric methods only. Additional techniques are strongly recommended or even necessary to obtain a full understanding of the exact degradation mechanism. sm.

Additional information

Authors: HAANAPEL V A C, JRC - IHCP Ispra (IT);STROOSNIJDER M F, JRC - IHCP Ispra (IT);SCHMUTZLER H J, ABB - Corporate Research Heidelberg (DE)
Bibliographic Reference: Article: Surface Engineering, 1998
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