Directional solidification of TiAl alloys using a polycrystalline seed

Acta Metall Sin

2006, Vol. 42

Issue (12): 1238-1242 DOI:

Research Articles

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Directional solidification of TiAl alloys using a polycrystalline seed

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西北工业大学

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. Directional solidification of TiAl alloys using a polycrystalline seed. Acta Metall Sin, 2006, 42(12): 1238-1242 .

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Abstract Directional solidification (DS) of Ti-46Al and Ti-43Al-3Si alloys using a polycrystalline seed material of Ti-43Al-3Si by self-made EMCS experimental apparatus with wide range of velocity has been studied. Successful DS ingots were obtained with fully lamellar microstructure parallel to longitudinal axis when the growth rates increased from 60 to 120mm/h. The ingot grown at 60mm/h exhibited typical lamellar microstructure aligned along the growth direction from the seed crystal up to the end part of ingot. On the contrary, as the growth rate increased, the orientation of lamellar microstructure changed beyond the transition point.

Key words: Directional solidification Lamellar microstructure Seeding TiAl

Received: 24 February 2006

ZTFLH:

TG132.32

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I12/1238

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