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Abstract

The effect of chromium (Cr) and yttrium (Y) implantation on the isothermal and cyclic oxidation behaviour in air of a boron-doped Ni(3)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 Ni(3)Al was prone to spallation. Upon 200 h at 585 C (isothermal or cyclic oxidation) the scale comprised an outer NiO layer, an intermediate layer of pure Ni and an internal oxidation zone (IOZ). At 900 C the scale consisted of an outer NiO layer, an intermediate Ni- and Al-rich oxide zone, and an inner thin alumina layer. A similar scale pattern was observed for the non-implanted material. However, the oxide scale formed on the non-implanted material did not showed 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 alumina layer, induced by the presence of chromium. No spallation of the oxide scale occurred, even after 200 cycles, at 900 C. C.

Additional information

Authors: GONZÁLEZ-CARRASCO J L, Centro Nacional de Investigaciones Metalúrgicas (CSIC), Madrid (ES);PÉREZ P, Centro Nacional de Investigaciones Metalúrgicas (CSIC), Madrid (ES);ADEVA P, Centro Nacional de Investigaciones Metalúrgicas (CSIC), Madrid (ES);HAANAPPEL V A C, JRC Ispra (IT);STROOSNIJDER M F, JRC Ispra (IT);GONZALEZ-CARRASCO J L, Centro Nacional de Investigaciones Metalurgicas (CSIC), Madrid (ES);PEREZ P, Centro Nacional de Investigaciones Metalurgicas (CSIC), Madrid (ES)
Bibliographic Reference: Article: Materials Science and Technology (1998)
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