Theory of volumetric crystallization of the undercooled melt
โ Scribed by A.A. Chernov
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 276 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0017-9310
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โฆ Synopsis
The model of volumetric crystallization of the undercooled melt is presented. This model consists in proper consideration of heat release, caused by phase transition, by means of substitution of real distribution of the temperature field, formed in the melt around the growing sites of a new phase, into the kinetic equations describing the process. Numerical solution to the problem was derived at the example of metal melt crystallization. The current model is compared with the isothermal model and the model, based on consideration of heat release in balance relationships.
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## On the Mechanism of Crystal Growth from Undercooled Melts The mechanism of crystal growth from undercooled melts is studied experimentally by means of a simple capillary technique. Thymol and Na&&O,. 5 H,O are used as model substanc,es. Dislocation-free crystal faces of these compounds are obta
Techniques of containlerless processing are applied to undercool and solidify metals and alloys. These techniques allow direct measurements of crystal growth velocity as a function of undercooling. Experimental results are presented for pure Ni, dilute Ni-B alloys, and intermetallic compounds of FeS