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JOM

, Volume 70, Issue 5, pp 726–732 | Cite as

Crystal Nucleation and Growth in Undercooled Melts of Pure Zr, Binary Zr-Based and Ternary Zr-Ni-Cu Glass-Forming Alloys

  • Dieter M. Herlach
  • Raphael Kobold
  • Stefan Klein
Liquid->Solid->Solid Phase Transformations: Characterization and Modeling
  • 160 Downloads

Abstract

Glass formation of a liquid undercooled below its melting temperature requires the complete avoidance of crystal nucleation and subsequent crystal growth. Even though they are not part of the glass formation process, a detailed knowledge of both processes involved in crystallization is mandatory to determine the glass-forming ability of metals and metallic alloys. In the present work, methods of containerless processing of drops by electrostatic and electromagnetic levitation are applied to undercool metallic melts prior to solidification. Heterogeneous nucleation on crucible walls is completely avoided giving access to large undercoolings. A freely suspended drop offers the additional benefit of showing the rapid crystallization process of an undercooled melt in situ by proper diagnostic means. As a reference, crystal nucleation and dendrite growth in the undercooled melt of pure Zr are experimentally investigated. Equivalently, binary Zr-Cu, Zr-Ni and Zr-Pd and ternary Zr-Ni-Cu alloys are studied, whose glass-forming abilities differ. The experimental results are analyzed within classical nucleation theory and models of dendrite growth. The findings give detailed knowledge about the nucleation-undercooling statistics and the growth kinetics over a large range of undercooling.

Notes

Acknowledgements

The authors are very grateful to Peter Galenko and Jan Gegner for intense discussions and calculations of the growth velocity as a function of undercooling of pure Zr. We thank the German Research Foundation DFG for financial support within the Contracts HE1601/26, HE1601/21 and HE1601/28.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Institut für Materialphysik im WeltraumDeutsches Zentrum für Luft- und RaumfahrtCologneGermany
  2. 2.Institut für Experimentalphysik IVRuhr-Universität BochumBochumGermany
  3. 3.Institut für Metallische WerkstoffeFriedrich Schiller-UniversitätJenaGermany
  4. 4.Deutsche Gesellschaft für MaterialkundeSt. AugustinGermany

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