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Minor additions of Sn in a bulk glass-forming Fe-based system

Published online by Cambridge University Press:  03 March 2011

Z.P. Lu ,
C.T. Liu  and
X.Z. Wang
Z.P. Lu*
Affiliation:
Metals and Ceramic Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830-6115
C.T. Liu
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
X.Z. Wang
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
*
a) Address all correspondence to this author. e-mail: luzp@ornl.gov
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Abstract

Minor additions of Sn in the bulk glass-forming Fe61−xSnxY2Zr8Co5Cr2Mo7B15 (x = 0% to 2%) system were studied in detail. It was found that combinations of Y and Sn can scavenge oxygen out of the undercooled liquids to form innocuous oxides, thus stabilizing the liquids. Besides this beneficial scavenging effect, Sn additions in the present Fe-based alloys also showed complex alloying effects on glass formation, which can be divided into three stages. At stage I (x ≤ 0.5%), the microalloyed compositions associate with the same eutectic as that of the base alloy. The glass-forming ability (GFA) of the resulting alloys is determined primarily by their liquidus temperature and similar to that of the base alloy. At stage II (0.85% ≤ x ≤ 1.15%), glass-matrix composite structures start to form because the alloy compositions are adjusted into a new “deeper” eutectic system. At stage III (x > 1.15%), however, alloy compositions shift to another new eutectic system, and the GFA is dramatically decreased due to the strong formation of primary phase α–Fe. Homogeneous glass-matrix composites with a diameter of 7 mm in the alloy containing 1.0–1.15% Sn were successfully produced.

Keywords

AmorphousPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 12 , December 2006 , pp. 3180 - 3186
Copyright
Copyright © Materials Research Society 2006

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References

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