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| MICROSTRUCTURAL EVOLUTION OF Ti-47Al ALLOY DURING DIRECTIONAL SOLIDIFICATION BY SEEDING METHOD |
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| 西北工业大学 |
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Cite this article:
. MICROSTRUCTURAL EVOLUTION OF Ti-47Al ALLOY DURING DIRECTIONAL SOLIDIFICATION BY SEEDING METHOD. Acta Metall Sin, 2007, 43(9): 897-902 .
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Abstract Microstructural selection during the directional solidification (DS) of Ti-47Al grown from a Ti-43Al-3Si seed was studied. The high-temperature hexagonal close packed α-phase in a cellular growth condition were correctly oriented so that the DS ingot with fully lamellar microstructure parallel to DS direction was successfully obtained at growth rate of 90mm/h. As the liquid composition closed to Ti-47Al, because of the variation of growth rates and the effect of solidification interface morphologies on solute segregation, βphase started to nucleated and grown in the interdendritic of α phase, lamellar microstructures inclined with angles of 45º to the growth direction were grown, thus successful seeding from the Ti-43Al-3Si seed was interrupted. Fine α dendritic in preferred crystallographic direction were obtained when the growth rate increased to 720mm/h.
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Received: 22 December 2006
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