Abstract
The oxidation behavior of an Fe 61B 15Zr 8Mo 7Co 5Y 2Cr 2 bulk metallic glass (Fe7-BMG) and its crystalline counterpart (XFe7) was studied over the temperature range of 550–700 °C in dry air. In general, the results showed that the oxidation kinetics of the Fe7-BMG and XFe7 alloys followed a parabolic-rate law, with their oxidation rates increasing with temperature. It was found that the oxidation rate constants ( k p values) of the Fe7-BMG are slightly higher than those of XFe7, indicating that the amorphous alloy underwent a fast oxidation reaction. The scale formed on the Fe7-BMG at 550 °C for 48 h was thin and heterophasic mixture of iron oxides (Fe 2O 3/Fe 3O 4) and tetragonal-ZrO 2 (t-ZrO 2). At higher temperatures ( T ≥ 600 °C), duplex scales formed on the glassy alloy consisted of an outer layer of iron oxides (Fe 2O 3/Fe 3O 4) and minor amounts of B 2O 3, and of a heterophasic inner layer of mostly t-ZrO 2 intermixed with non-oxidized Fe 3B, FeCo, and ZrB 12. The formation of the crystalline intermetallics indicated the occurrence of the substrate crystallization at the temperature range of interest.
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