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| Lamellar Orientation Control of TiAl Alloys by Directional Solidification with a seed technique |
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| 西北工业大学 |
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Cite this article:
;. Lamellar Orientation Control of TiAl Alloys by Directional Solidification with a seed technique. Acta Metall Sin, 2007, 43(12): 1287-1292 .
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Abstract By using a seed crystal, the TiAl/Ti3Al lamellar orientation was aligned parallel to the growth direction in directionally solidified Ti-47Al alloys. The solidification behavior of hypo-peritectic and hyper-peritectic alloys in TiAl equilibrium phase diagram was studied, and the composition range of successful seeding of TiAl alloys was also determined. Through the lamellar microstructure examination of Ti-47Al alloys directionally solidified from Ti-43Al-3Si seed under the conditions of different growth rates, it was found that a successful seeding requires that the solid/liquid interface must be planer during solidification. This can be achieved by growing crystals at a sufficiently high thermal gradient in the liquid and at a sufficiently low growth rate. It showed that the seeding process easily failed if cells or dendrites formatted, new grains would nucleated or α grains with a preferred growth orientation of <0001> would protrude to the liquid, then the lamellar direction was changed.
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Received: 28 March 2007
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