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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/23508

Title: Air oxidation of a Zr58Cu22Al12Fe8 bulk metallic glass at 350–550 °C
Authors: W. Kai;Y.R. Chen;T.H. Ho;H.H. Hsieh;D.C. Qiao;F. Jiang;G. Fan;P.K. Liaw
Contributors: NTOU:Institute of Materials Engineering
Keywords: Bulk metallic glasses;Oxidation;X-ray diffraction;Thermal analysis;Microscopy
Date: 2009-08-26
Issue Date: 2011-10-20T08:06:27Z
Publisher: Journal of Alloys and Compounds
Abstract: Abstract:The oxidation behavior of the Zr58Cu22Al12Fe8 bulk metallic glasses (ZC4-BMG) was studied over the temperature range of 350–550 °C in dry air. The oxidation kinetics of the ZC4-BMG generally follow a multi-stage parabolic-rate law, and the steady-state parabolic-rate constants (kp values) increased with increasing the temperature when it is below the glass transition temperature (Tg = 413.3 °C). Conversely, the kp values were nearly identical from 400 to 550 °C. The scales formed on ZC4-BMG were composed mostly of tetragonal-ZrO2 (t-ZrO2) and minor amounts of Al2O3 and monoclinic-ZrO2 (m-ZrO2). The amounts of both Al2O3 and m-ZrO2 increased with increasing the temperature. In addition, the amorphous substrate remained unchanged after the oxidation for 36 h at T ≤ 375 °C. However, it transformed into different crystalline phases at higher temperatures, which are strongly dependent on the temperature and duration of time.
Relation: 483(1-2), pp.519–525
URI: http://ntour.ntou.edu.tw/handle/987654321/23508
Appears in Collections:[材料工程研究所] 期刊論文

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