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Influence of Al on glass forming ability and nanocrystallization behavior of cast-iron based bulk amorphous alloy

Published online by Cambridge University Press:  10 March 2015

Hyo Yun Jung ,
Mihai Stoica ,
Seong Hoon Yi ,
Do Hyang Kim  and
Jürgen Eckert
Hyo Yun Jung*
Affiliation:
Institute for Complex Materials, IFW Dresden, D-01069 Dresden, Germany
Mihai Stoica
Affiliation:
Institute for Complex Materials, IFW Dresden, D-01069 Dresden, Germany; and Politehnica University of Timisoara, 300006 Timisoara, Romania
Seong Hoon Yi
Affiliation:
Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu 702-701, South Korea
Do Hyang Kim
Affiliation:
Department of Metallurgical Engineering, Center for Non-crystalline Materials, Yonsei University, 120-749 Seoul, South Korea
Jürgen Eckert
Affiliation:
Institute for Complex Materials, IFW Dresden, D-01069 Dresden, Germany; and Institute of Materials Science, University of Technology Dresden, D-01062 Dresden, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Cast-iron (CI) based bulk amorphous alloy with compositions of Fe75.5−xC6.0Si3.3B5.5P8.7Cu1.0Alx (x = 0, 1 at.%) was synthesized by Cu mold casting. As indicated by increased critical diameters (dmax) for the amorphization, the substitution of Al enhanced the glass-forming ability of the alloy. However, the onset temperature of crystallization (Tx) and the range of supercooled liquid region (ΔTx) of the alloy decreased upon Al addition from 500 °C and 28 °C to 475 °C and 25 °C, respectively. It was revealed that the decreased thermal stability of the amorphous phase is related to the enhanced crystallization tendency to form primary α-Fe phase. Upon the nanocrystallization of primary α-Fe phase the Al-added alloy shows enlarged Ms of 176 emu g−1, still keeping a reasonable small Hc value of 0.086 Oe. The present study revealed that the minor Al addition enhances not only the glass-forming ability, but also the nanocrystallization behavior of the CI based bulk amorphous alloy.

Keywords

nanostructurephase transformationmagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 6 , 28 March 2015 , pp. 818 - 824
Copyright
Copyright © Materials Research Society 2015 

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