MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Air Oxidation of an Fe48Cr15C15Mo14B6Er2 Bulk Metallic Glass at 600–725°C
H. H. HsiehW. KaiR. T. HuangD. C. QiaoP. K. Liaw
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2007 Volume 48 Issue 7 Pages 1864-1869

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Abstract

The oxidation behavior of an Fe48Cr15C15Mo14B6Er2 bulk metallic glass (Fe-BMG) was studied over the temperature range of 600–725°C in dry air. The oxidation kinetics of the glassy alloy followed a two-stage parabolic rate law at T≤650°C, while the single-stage linear rate was observed at higher temperatures (T≥675°C). The oxidation rates of the Fe-BMG at T≤625°C were much lower than those of the commercial 304 stainless steel (304 SS), revealing the excellent oxidation resistance of the amorphous alloy. A continuous, thin layer of chromium oxide (Cr2O3) containing some iron was formed at T≤650°C, while typical hump iron oxides intermixed with minor amounts of Cr2O3 and MoO2 were observed at T≥675°C. In addition, a substrate phase transformation from the amorphous structure to Fe-Cr and FeCrMo crystalline phases was detected after the oxidation. Very likely, the formation of the non-protective Fe3O4 and MoO2 breaks the scale integrity and allows the rapid cation/anion transportation, resulting in the fast linear-kinetics behavior of the Fe-BMG at T≥675°C.

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© 2007 The Japan Institute of Metals and Materials
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