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Solidification Modeling of Bulk Amorphous Alloys

Published online by Cambridge University Press:  01 February 2011

Sang Bok Lee  and
Nack J. Kim
Sang Bok Lee
Affiliation:
Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790–784, Korea
Nack J. Kim
Affiliation:
Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790–784, Korea
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Abstract

Classical heterogeneous nucleation theory coupled with DTA data has been used to closely estimate the crystallization behavior of continuously cooled bulk metallic glass (BMG) alloys. Continuous cooling transformation and time temperature transformation diagrams of three BMG alloys, Zr41.2Ti13.8Cu12.5Ni10Be22.5, Cu47Ti33Zr11Ni6Si1Sn2 and Mg65Cu25Y10 alloys, have been calculated. The critical cooling rates Rc of three alloys were calculated to be 1.7 K/s, 242 K/s and 36 K/s for Zr41.2Ti13.8Cu12.5Ni10Be22.5, Cu47Ti33Zr11Ni6Si1Sn2 and of Mg65Cu25Y10 alloys, respectively, which match well with the experimental values. We conclude that heterogeneous nucleation is more favorable than homogeneous nucleation for the formation of crystals during cooling of BMG alloy liquids. Our approach can be applied to the analyses of crystallization kinetics of BMG alloys with a wide range of critical cooling rates during continuous cooling as well as isothermal annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM2.5
Copyright
Copyright © Materials Research Society 2004

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