Abstract
The oxidation behaviour of phases in the Zr-Al system has been studied in dry oxygen at elevated temperatures and isothermally. The oxidation of α-Zr-1 mass% Al, Zr3Al, Zr2Al, ZrAl and Zr2Al3 obeys a parabolic rate law, while the oxidation of ZrAl2 and ZrAl3 obeys a logarithmic rate equation. Zr3Al, Zr2Al, ZrAl, Zr2Al3 and ZrAl2 are selectively oxidized to give tetragonal and monoclinic ZrO2 as the oxidation product. During this process aluminium escapes oxidation by diffusion into the bulk of the alloy and forms there Zr2Al, Zr5Al3, Zr2Al3, ZrAl2 and ZrAl3 respectively, as a secondary product of oxidation. The new phases formed near the oxide alloy interface of higher aluminium content than the matrix phase, are the adjoining phases in the phase diagram of the Zr-Al system.
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