The Effect of Cr- and Y-Implantation on the Oxidation Behaviour of PM Ni3Al.

The effect of Cr- and Y-implantation on the isothermal and cyclic oxidation behaviour in air of a boron-doped Ni3 Al alloy at 585 and 900*C for up to 200 h is discussed. Y-implantation proved to be detrimental, causing slightly higher oxidation rates at both temperatures, while the scale formed at 900*C on Y-implanted Ni3 Al was prone to spallation. A similar `scale pattern was observed for the non-implanted material, however, the oxide scale formed on the non-implanted material did not show any significant susceptibility for scale cracking and spallation. Cr-implantation on the other hand was beneficial in that it decreased the oxidation rates at both temperatures due to the formation of a continuous healing aluminia layer, induced by the presence of chromium. No spallation of the oxide scale occurred, even after 200 cycles, at 900*C .

PEREZ P.;  GONZALEZ CARRASCO J.L.;  ADEVA P.;  HAANAPPEL Vincentius Antonius;  STROOSNIJDER Marinus Frederik; 

1998-06-04

JRC16080