Air-Oxidation Behavior of a [(Co50Cr15Mo14C15B6)97.5Er2.5]93Fe7 Bulk-Metallic Glass at 873聽K to 973聽K (600聽掳C to 700聽掳C)

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• 作者：Wu Kai (1) wkai@mail.ntou.edu.tw
  Yuan-Hao Wu (1)
  Wei Shen Chen (1)
  Rong-Tan Huang (1)
  Haoling Jia (2)
  Peter K. Liaw (2)
  Tao Zhang (3)
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：43
• 期：8
• 页码：2721-2728
• 全文大小：1.1 MB
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• 作者单位：1. Institute of Materials Engineering, National Taiwan Ocean University, Keelung, 20224 Taiwan, R.O.C.2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA3. Department of Materials Science and Engineering, Beihang University, Beijing, 100191 P.R. China
• ISSN：1543-1940

文摘

The oxidation behavior of a [(Co₅₀Cr₁₅Mo₁₄C₁₅B₆)_97.5Er_2.5]₉₃Fe₇ bulk-metallic glass (Co7-BMG) was studied over the temperature range of 873 K to 973 K (600 掳C to 700 掳C) in dry air. The oxidation kinetics of the Co7-BMG generally followed the parabolic-rate law, as its oxidation rates increased with temperature. The scaling rate of the Co7-BMG was significantly lower than that of pure Co, which indicates a better oxidation resistance for the amorphous alloy. The scales formed on the Co7-BMG consisted mostly of CoMoO₄ and Co₃O₄, as well as minor amounts of CoO, Cr₂O₃, and uncorroded Co₃B. The formation of CoMoO₄ and Cr₂O₃ is responsible for the lower oxidation rates of the glassy alloy with respect to those of pure Co. In addition, the presence of Co₃B further indicated that the crystallization of the amorphous substrate during the oxidation was taken place.