A Comparison Between Growth Morphology of "Eutectic" Cells/Dendrites and Single-Phase Cells/Dendrites
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Directionally solidified (DS) intermetallic and ceramicbased eutectic alloys with an in-situ composite microstructure microstructure containing finely distributed, long aspect ratio, fiber, or plate reinforcements are being seriously examined for several advanced aero-propulsion applications. In designing these alloys, additional solutes need to be added to the base eutectic composition in order to improve their high temperature strength, and provide for adequate toughness and resistance to environmental degradation. Solute addition, however, promotes instability at the planar liquid-solid interface resulting in the formation of two-phase eutectic “colonies.”[1–4] Because morphology of eutectic colonies is very similar to the single-phase cells and dendrites, the stability analysis of Mullins and Sekerka has been extended to describe their formation.[6,7,8] Onset of their formation shows a good agreement with this approach; however, unlike the single-phase cells and dendrites, there is limited examination of their growth speed dependence of spacing, morphology, and spatial distribution.[4,10–11] The purpose of this study is to compare the growth speed dependence of the morphology, spacing, and spatial distribution of eutectic cells and dendrites with that for the single-phase cells and dendrites.
Tewari, Surendra N.; Raj, S. V.; and Locci, L. E., "A Comparison Between Growth Morphology of "Eutectic" Cells/Dendrites and Single-Phase Cells/Dendrites" (2004). Chemical & Biomedical Engineering Faculty Publications. 2.
Tewari, S.N., Raj, S.V. & Locci, I.E. (2004). A Comparison Between Growth Morphology of "Eutectic" Cells/Dendrites and Single-Phase Cells/Dendrites. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 35A, 1632-1635.
Copyright 2004 ASM International. This paper was published in Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 35A, Issue 5, pp. 1632-1635 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.
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