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Pronounced enhancement of glass-forming ability of Fe–Si–B–P bulk metallic glass in oxygen atmosphere

Published online by Cambridge University Press:  13 May 2014

Chuntao Chang*
Affiliation:
Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Zhenhai District, Ningbo, Zhejiang 315201, China
Jianhua Zhang*
Affiliation:
College of Electrical and Power Engineering, Shanxi Key Laboratory of Coal Mining Equipment and Safety Control, Taiyuan University of Technology, Wanbolin District, Taiyuan, Shanxi 030024, China
Baolong Shen
Affiliation:
School of Materials Science and Engineering, Southeast University, Jiangning District, Nanjing 211189, China
Weihua Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Akihisa Inoue
Affiliation:
Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Zhenhai District, Ningbo, Zhejiang 315201, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

It is widely accepted that oxygen will severely deteriorate the glass-forming ability (GFA) of an alloy. In this work, we report that the GFA of a Fe76Si9B10P5 glassy alloy can be significantly improved (the critical diameter for fully glass formation is increased from 1 to 3 mm) under oxygen casting atmosphere. Furthermore, the pressure of oxygen atmosphere gives an obvious enhancement in the critical diameter of Fe76Si9B10P5 glassy alloy. A dependence of GFA on casting atmosphere species (argon, nitrogen, air, and oxygen) is also observed for this glassy alloy, and its critical diameter is 1, 1.5, 2.5, and 3 mm, respectively. In addition, the Fe-based glassy alloy exhibits excellent soft magnetic properties regardless of the applied casting atmosphere. The mechanism for such an unusual oxygen effect on the GFA of Fe76Si9B10P5 glassy alloy is attributed to the reduced nucleation rate caused by the enhancement of surface tension of the alloy melt.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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