Abstract
The oxidation of Zr 2Al 3 in dry oxygen in the temperature range 875–965 K obeys a parabolic rate law. An activation energy of 270 kJ mol −1 has been estimated. During the oxidation, aluminium diffuses from the oxide layer into the Zr 2Al 3 bulk, thus forming the ZrAl 2 phase very close to the oxide-alloy interface. The excess zirconium is therefore selectively oxidized, giving tetragonal and monoclinic ZrO 2 containing no Al 2O 3.
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