Cyclic oxidation behavior and recrystallization of cold-rolled Ni3Al foils

Abstract

The floating zone (FZ) method makes it possible to fabricate Ni3Al thin foils by cold rolling up to 96% without any intermediate annealing steps or boron addition. For the practical application of Ni3Al foils, oxidation behavior, in addition to mechanical properties, at high temperature should be investigated. The cyclic oxidation properties at 1000 degreesC of cold-rolled Ni3Al foil were investigated, and compared with those of bulk Ni3Al alloy produced by conventional casting. The Ni3Al foil exhibited more stable oxidation behavior than the bulk Ni3Al alloy; in addition, the more stable oxidation behavior of Ni3Al foil relative to bulk Ni3Al alloy was attributable to an abrupt increase of grain boundaries due to recrystallization. (C) 2004 Elsevier B.V. All rights reserved.