NTRS - NASA Technical Reports Server

Back to Results
the effect of growth rate on interface morphologySince significantly different solidification structures of a given alloy can be obtained by varying experimental growth rates, it is desirable to understand the basic factors which control the formation and stability of these microstructures when conditions are altered. Directional solidification experiments are described and the results obtained in metallic and transparent organic systems are presented. Emphasis is on the characteristics of dendritic structures obtained under different solidification conditions. Specifically, the effect of the growth rate on the primary dendritic spacing, the secondary dendrite spacing, and the dendrite tip radius is discussed. It is shown that significant changes in the primary spacing are observed when a dendrite to cellular transition takes place at lower velocities. It is found that the primary cellular spacing is much smaller than the primary dendrite spacing so that a maximum in the primary spacing occurs as a function of velocity at the dendrite-cellular transition. A theoretical model is also described which quantitatively explains various microstructural features of dendritic and cellular structures.
Document ID
Document Type
Conference Paper
Trivedi, R.
(Ames Lab. IA, United States)
Somboonsuk, K.
(Ames Lab. IA, United States)
Date Acquired
August 12, 2013
Publication Date
April 15, 1984
Publication Information
Publication: JPL Proc. of the Flat-Plate Solar Array Proj. Res. Forum on the High-Speed Growth and Characterization of Crystals for Solar Cells
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle19840020545Analytic PrimaryProceedings of the Flat-plate Solar Array Project Research Forum on the High-speed Growth and Characterization of Crystals for Solar Cells
Document Inquiry