Image icon  Rapid solidification in an atomised droplet

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Description: Because of the fine scale of the droplet, heat extraction is very rapid, and large undercoolings are achieved before crystal nucleation can begin. Thus, in this droplet, the solidification front has advanced very rapidly through the droplet from the nucleation point (on the surface at the left of the image). Its velocity is initially so great that no interfacial breakdown is possible. As the front advances, however, latent heat is evolved and this 'recalescence' reduces the rate of solidification to a point where interfacial breakdown is possible and a cellular structure is observed in the last region to solidify (at the right hand side of the image).
Keywords: alloy • atomising • droplet • hypercooled • latent heat • metal • rapid solidification • recalescence • soldidification
Categories: Science approaches > Microstructure
Science approaches > Phase transformations
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
Prof T W Clyne, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 03 October 2002
Date added: 21 August 2009
Resource ID: 1647