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Title: Air Oxidation of an Fe48Cr15C15Mo14B6Er2 Bulk Metallic Glass at 600–725°C
Authors: H. H. Hsieh;W. Kai;R. T. Huang;D. C. Qiao;P. K. Liaw
Contributors: NTOU:Institute of Materials Engineering
Keywords: oxidation;Fe48Cr15C15Mo14B6Er2 alloy;metal glass
Date: 2007
Issue Date: 2011-10-20T08:06:18Z
Publisher: Materials Transactions(The Japan Institute of Metals )
Abstract: 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≥q 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≥q 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≥q 675°C.
Relation: 48(07), pp.1864-1869
URI: http://ntour.ntou.edu.tw/handle/987654321/23457
Appears in Collections:[材料工程研究所] 期刊論文

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