Abstract
The rare earth element cerium (Ce) was added to cast binary Ti-44 at.% Al alloys by arc melting in the range of 0.05 to 0.3 atomic percent. It was observed that the as-cast structures of the ingots consisted of the usual three zones of fine equiaxed grains near the mould wall, columnar grains growing away from the mould wall and coarse equiaxed grains near the center. Ce greatly promoted the growth of columnar grains and reduced their diameters. The ingots were subsequently heat treated to obtain well-defined fully lamellar structures. The material containing no rare earth displayed large equiaxed lamellar colonies of average size of >1400 μm; the material with 0.05 at.% addition of Ce consisted of lamellar colonies of as fine as ∼440 μm. The finest grain size of this material was 320 μm at the top position in the ingot.
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References
T. W. Kim, in “Gamma Titanium Aluminides,” edited by Y.-W. Kim, R. Wagner and M. Yamaguchi (TMS, Warrendale, PA, USA, 1995) pp. 637-654.
S. C. Huang and J. C. Chesnutt, in “Intermetallic Compounds,” Vol. 2, edited by J. H. Westbrook and R. L. Fleischer (John Wiley & Sons, Chichester, UK, 1995) pp. 73-90.
Y.-M. Kim, JOM 46(7) (1994) 30-39.
Idem., Mater. Sci. Eng. A192/193 (1995) 519-533.
B. London et al., in “Structural Intermetallics,” edited by R. Darolia et al. (TMS, Warrendale, PA, USA, 1993) pp. 151-157.
R. Wagner et al., in “Gamma Titanium Aluminides,” edited by Y.-M. Kim, R. Wagner and M. Yamaguchi (TMS, Warrendale, PA, USA, 1995) pp. 387-404.
S. C. Huang and E. L. Hall, in “High-Temperature Ordered Intermetallic Alloys IV,” edited by L. A. Johnson, D. P. Pope and J. O. Stiegler (Materials Research Society, Pittsburgh, PA, USA, 1991) pp. 827-832.
J. Gschneidner, K. A. , B. J. Beaudry and J. Capellen, in “Metals Handbook,”Vol. 2 (ASM International, Materials Park, OH, USA, 1990) pp. 720-732.
S.-S. Lian and H.-C. Huang, in “First International Conference on Processing Material for Properties,” edited by H. Henein and T. Oki (TMS, Warrendale, PA, USA, 1993) pp. 245-247.
S. Chen et al., Acta Metall. Sinica 30(1) (1994) A20-A24.
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Liu, C.M., Li, W. & Xia, K. Effects of cerium on the microstructures and grain sizes of cast TiAl alloys. Journal of Materials Science 35, 975–980 (2000). https://doi.org/10.1023/A:1004719012602
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DOI: https://doi.org/10.1023/A:1004719012602