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Record Details

Record 77 of 43648
The Effect of Growth Rate on Interface Morphology
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Author and Affiliation:
Trivedi, R.(Ames Lab., IA, United States)
Somboonsuk, K.(Ames Lab., IA, United States)
Abstract: Since 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.
Publication Date: Apr 15, 1984
Document ID:
19840020555
(Acquired Nov 13, 1995)
Accession Number: 84N28624
Subject Category: SOLID-STATE PHYSICS
Document Type: Conference Paper
Publication Information: JPL Proc. of the Flat-Plate Solar Array Proj. Res. Forum on the High-Speed Growth and Characterization of Crystals for Solar Cells; p. p 177-190
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Ames Lab.; IA, United States
Iowa State Univ. of Science and Technology; Ames, IA, United States
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: CRYSTAL GROWTH; DIRECTIONAL SOLIDIFICATION (CRYSTALS); LIQUID-SOLID INTERFACES; MICROSTRUCTURE; BINARY ALLOYS; DENDRITIC CRYSTALS; DRAWINGS; PLANAR STRUCTURES; SURFACE ENERGY
Imprint And Other Notes: In JPL Proc. of the Flat-Plate Solar Array Proj. Res. Forum on the High-Speed Growth and Characterization of Crystals for Solar Cells p 177-190 (SEE N84-28614 18-76)
Miscellaneous Notes: Prepared in cooperation with Iowa State Univ., Ames
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