Dendritic growth from amorphous matrix
Technical Report
·
OSTI ID:6063546
The morphological development of tridymite, SiO/sub 2/ precipitated from a soda-lead-silicate glass was studied under isothermal conditions. Two different morphologies were observed in this study, i.e., hexagonal and trigonal. These morphologies were dependent on undercooling and they changed from plates at small undercoolings to dendrites and spherulites with increasing undercooling. The growth rate, V, and tip radius, rho, of dendrite were studied as a function of undercooling. The dendrite tip stability criterion, V/rho//sup 2/ = constant, was found to be invalid for this system at high undercooling. The ratio of dendrite tip radius, rho, and initial secondary spacing was found to be constant, equal to 2.0, over the undercooling range of 150 K. The growth and dissolution rates are found to be controlled by the same mechanism.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6063546
- Report Number(s):
- IS-T-1119; ON: DE85007630
- Country of Publication:
- United States
- Language:
- English
Similar Records
Three-dimensional dendrite-tip morphology at low undercooling
Effect of growth rate dependent partition coefficient on the dendritic growth in undercooled melts
A model for silicon dendrite growth during laser/plasma deposition from a silane discharge
Journal Article
·
Fri Mar 31 23:00:00 EST 2000
· Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
·
OSTI ID:20216092
Effect of growth rate dependent partition coefficient on the dendritic growth in undercooled melts
Journal Article
·
Tue Mar 31 23:00:00 EST 1987
· Acta Metall.; (United States)
·
OSTI ID:5621251
A model for silicon dendrite growth during laser/plasma deposition from a silane discharge
Conference
·
Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:6670971