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Glass Forming Ability and Crystallization Behaviors of the Ti-Cu-Ni-(Sn) Alloys with Large Supercooled Liquid Region

Published online by Cambridge University Press:  17 March 2011

Y.C. Kim ,
S. Yi ,
W.T. Kim  and
D.H. Kim
Y.C. Kim
Affiliation:
Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea
S. Yi
Affiliation:
Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea
W.T. Kim
Affiliation:
Center for Noncrystalline Materials, Dept. of Physics, Chongju University 36 Naedok Dong, Chongju, Chungbuk, 360-764, Korea
D.H. Kim
Affiliation:
Center for Noncrystalline Materials, Dept. of Metallurgical Eng., Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea
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Abstract

The thermal stability and crystallization behavior of melt spun amorphous Ti50Cu35Ni15-xSnx (x=0, 3, 5, 7) alloys has been studied in by thermal analysis (DSC and DTA) and X-ray diffractometry. Partial replacement of Ni by Sn up to 5 at % in Ti50Cu35Ni15 alloy improved thermal stability and glass forming ability. The onset temperature of the first exotherm increased from 739 to 756 K with increasing Sn content x from 0 to 5, and then decreased to 745 K for the alloy with x=7 due to change in crystallization sequence. Melt spun amorphous Ti50Cu35Ni12Sn3 and Ti50Cu35Ni10Sn5 alloys exhibit ΔTx exceeding 78 and 76 K, respectively, which is significantly larger than ΔTx of 46 K in Ti50Cu35Ni15 alloy. Amorphous Ti50Cu35Ni15 alloy crystallized by precipitation of supersaturated cubic Ti(Ni,Cu) phase followed by decomposition into a mixture of TiCu and TiNi at higher temperature. Amorphous Ti50Cu35Ni15-xSnx (x=3, 5) phase crystallized by precipitation of cubic Ti(Ni,Cu) phase, followed by transformation into a mixture of TiNi, TiCu, Ti3Sn phases. Amorphous Ti50Cu32Ni8Sn7 phase crystallized by co- precipitation of cubic Ti(Ni,Cu) phase and unidentified phase, followed by transformation into a mixture of TiNi, TiCu, Ti3Sn phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L4.9
Copyright
Copyright © Materials Research Society 2001

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