Microscopic Observation of the Solidification of Small Metal Droplets
作者:
D. Turnbull,
R. E. Cech,
期刊:
Journal of Applied Physics
(AIP Available online 1950)
卷期:
Volume 21,
issue 8
页码: 804-810
ISSN:0021-8979
年代: 1950
DOI:10.1063/1.1699763
出版商: AIP
数据来源: AIP
摘要:
The solidification behavior of small metal (10 to 100 micron diameter) droplets has been observed on a high temperature microscope stage. An abrupt change in surface appearance and in the case of high melting metals a sudden brightening (``blick'') accompanies solidification. The solidification temperatures observed for a collection of droplets may be widely distributed, but a significant, usually the major, fraction of the droplets supercool some maximum amount (&Dgr;T‐)maxthat is reproducible and characteristic of the metal. For many metals (&Dgr;T‐)max≈0.18 times the absolute melting temperature. (&Dgr;T‐)maxis not much changed by wide variations in the cooling rate and droplet size. The growth rate of metal crystals is very great so that the solidification rate of the droplets is controlled by the nucleation frequency.
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