Improvement of the Oxidation Resistance of gamma Titanium Aluminides by Microalloying with Chlorine using Ion Implantation


Improvement of the Oxidation Resistance of gamma Titanium Aluminides by Microalloying with Chlorine using Ion Implantation

Schumacher, G.; Lang, C.; Schütze, M.; Hornauer, U.; Richter, E.; Wieser, E.; Möller, W.

High oxidation resistance of gamma titanium aluminides can be achieved by the formation of a continuous scale of slowly growing Al2O3. The formation of such a scale was stimulated by the addition of small amounts of chlorine. The additions were incorporated by ion implantation into the sample. The g-TiAl samples were oxidized at 1173 K in air for 100 h. Even if chlorine is present in very small quantities, it has a highly beneficial effect on the oxidation resistance (microalloying effect). The kinetics are changed from mixed TiO2/Al2O3- kinetics for unimplanted specimens to pure Al2O3- kinetics for chlorine implanted specimens.

  • Materials and Corrosion 50, 162-165 (1999)

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Publ.-Id: 2029