Paper Title:
Heterogeneous Nucleation and Grain Formation on Spherical and Flat Substrates
  Abstract

Turnbull’s transformation nucleus model initiated the concept of a growth barrier for a spherical-cap crystal nucleus growing on a small flat substrate. The recently developed free growth model provided a clear physical picture of the growth barrier concept with experimental and modelling support. Fletcher’s spherical substrate model enhanced the understanding of the geometrical effect of a substrate on nucleation. A recent novel analysis of Fletcher’s model furnished new insights into the similarities and differences between nucleation on spherical and flat substrates. It is necessary to distinguish between the undercooling required for nucleation and that for overcoming the growth barrier; the greater one determines the early stages of grain formation.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
1339-1342
DOI
10.4028/www.scientific.net/MSF.654-656.1339
Citation
M. Qian, "Heterogeneous Nucleation and Grain Formation on Spherical and Flat Substrates", Materials Science Forum, Vols. 654-656, pp. 1339-1342, 2010
Online since
June 2010
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