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The cyclic oxidation behaviour of PM Ni3Al in air at elevated temperatures: The effect of Cr- and Y-implantation

AuthorsHaanappel, V.A.C.; Pérez Zubiaur, Pablo; González-Carrasco, José Luis; Stroosnijder, M. F.
Issue Date1998
CitationIntermetallics 6: 347-356 (1998)
AbstractThe effect of Cr- and Y-implantation on the cyclic oxidation behaviour of a boron-doped Ni3Al alloy at 585, 730, and 900°C in air has been studied. Compared with non-implanted material, Y-implantation caused slightly higher oxidation rates from the earliest oxidation stage. Furthermore, the scale was prone to significant spallation at 900°C, at least to a much higher extent than for the non-implanted material. Upon exposure at 585 and 730°C a scale is formed consisting of 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 oxidation zone, and an inner thin alumina layer. Similar results were obtained with the non-implanted material. Cr-implantation, however, considerably decreased the cyclic oxidation rate, through the formation of a thin alumina layer, induced by the presence of chromium. No spallation of the oxide scale occurred even at 900°C. © 1998 Published by Elsevier Science Limited. All rights reserved.
Identifiersdoi: 10.1016/S0966-9795(97)00077-0
issn: 0966-9795
Appears in Collections:(CENIM) Artículos
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