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Bulk glass formation in the Ni–Zr–Ti–Nb–Si–Sn alloy system

Published online by Cambridge University Press:  03 March 2011

J.Y. Lee ,
D.H. Bae ,
J.K. Lee  and
D.H. Kim
J.Y. Lee
Affiliation:
Center for Non-Crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul, South Korea
D.H. Bae
Affiliation:
Department of Metallurgical Engineering, Yonsei University, Seoul, South Korea
J.K. Lee
Affiliation:
R&D Division for Bulk Amorphous & Nano Materials, Korea Institute of Industrial Technology, CheonAn, South Korea
D.H. Kim*
Affiliation:
Center for Non-Crystalline Materials, Department of Metallurgical Engineering, Yonsei University, Seoul, South Korea
*
a) Address all correspondence to this author. e-mail: dohkim@yonsei.ac.kr
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Abstract

In this study, the effect of addition of Nb on glass formation in Ni–Ti–Zr–Si–Sn alloys has been studied. The composition range for bulk glass formation with Dmax > 2 mm (Dmax, maximum diameter for glass formation by injection cast method) becomes wider when compared with the non-Nb–containing alloy. The ΔTx (= Tx – Tg; Tx, crystallization onset temperature; Tg, glass transition temperature), Trg (= Tg/Tl; Tl, liquidus temperature) and γ [= Tx/(Tl + Tg)] values for the alloys Dmax > 2 mm are in the range of 40–59, 0.638–0.651, and 0.410–0.419, respectively. The compositions of the alloys (Dmax > 2 mm) are closer to pseudo-eutectic composition than that of the alloy without Nb, showing an improved glass forming ability. The critical cooling rate for glass formation (Dmax = 5 mm) is estimated to be order of approximately 40 K/s.

Keywords

Metallic glassCastingCalorimetry

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Type
Rapid Communications
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2221 - 2225
Copyright
Copyright © Materials Research Society 2004

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