Skip to main content Accessibility help
×
Home

Crystal Nucleation in Submicron Droplets of Pure Elements

  • Louis M. Holzman (a1), Thomas F. Kelly (a1) (a2) and W. N. G. Hitchon (a1) (a3)

Abstract

Liquid-to-crystal nucleation has been studied extensively through droplet experiments to locate examples of homogeneous nucleation. However, prior to this work very few examples have been found, which implies that the experiments have not been able to isolate heterogeneous nucleants in a small percentage of the droplets as is required. In this research, electrohydrodynamic atomization (EHD) is used to produce sub-Micron droplets of pure elements that are largely free of heterogeneous nucleants.

Diffraction patterns of individual EHD-produced droplets are viewed to determine the fraction of crystalline droplets produced as a function of droplet radius. These results are compared to theories for surface and volume heterogeneous nucleation and for homophase nucleation. It is found that Si and Ge nucleate through either homogeneous nucleation or nucleation by homophase impurities. Nucleation results for vanadium and iron were not conclusive.

Copyright

References

Hide All
1. TurnbuU, D., J. Appl. Phys. 21, 1022 (1950).
2. Turnbull, D., J. Chem. Phys. 20, 411 (1952).
3. Miyazawa, Y. and Pound, G. M., J. Cryst. Growth 23, 45 (1974).
4. Perepczko, J. H., Mat. Sci. and Engr. 65, 125 (1984).
5. Drehman, A. J. and Turnbull, D., Scripta Metall. 15, 543 (1981).
6. Kim, Y-W., Lin, H.-M., and Kelly, T. F., Acta Metall. 37, 247 (1989).
7. Perel, J., Mahoney, J. F., Kalensher, B. E., Vickers, K. E. and Mehrabian, R., in Rapid Solidification Processing Principles and Technologies. Mehrabian, R., Kear, B. H. and Cohen, M. (Claitor's Publishing Division, Baton Rouge, LA, 1978) 258.
8. Perel, J., Mahoney, J. F., Duwez, P. and Kalensher, B. E., in Rapid Solidification Processing Principles and Technologies II. edited by Mehrabian, R., Kear, B. H. and Cohen, M. (Claitor's Publishing Division, Baton Rouge, LA, 1980) 287.
9. Turnbull, D., Progress in Mat. Sci. - Chalmers Anniversary Volume, 269, (1981).
10. Kelly, T. F., Cohen, M., and Vander, J. B. Sande, Met. Trans. 15A, 819 (1984).
11. Kelly, T. F. and Vander Sande, J. B., Int. J. of Rapid Solid. 3, 51 (1987).

Crystal Nucleation in Submicron Droplets of Pure Elements

  • Louis M. Holzman (a1), Thomas F. Kelly (a1) (a2) and W. N. G. Hitchon (a1) (a3)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed