Abstract
Using a Bridgman vertical vacuum furnace, Ti-45Al-8Nb-(W,B,Y) (at.%) bars, which were prepared from a plasma arc melting (PAM) ingot, were directionally solidified at growth rates of 10, 15, and 20 μm/s. Polysynthetic twinned (PST) crystal with an aligned lamellar microstructure was obtained at the growth rate of 15 μm/s because of high Nb addition. The principle of PST crystal growth and the effect of Nb element were discussed. The results of investigations on microstructure and micromechanical properties of the directionally solidified (DS) bars of Ti-45Al-8Nb-(W,B,Y) alloy are briefly summarized.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Chen G.L., Zhang W.J., Liu Z.C., Li S.J., and Kim Y.W., Microstructure and properties of high-Nb containing TiAl-base alloys, [in] Proceedings of Symposium held during the 1999 TMS Annual Meeting, San Diego, 1999: 371.
Xu X.J., Lin J.P., Wang Y.L., Gao J.F., Lin Z., and Chen G.L., Microstructure and tensile properties of as-cast Ti-45Al-(8–9)Nb-(W, B, Y) alloy, J. Alloys Compd., 2006, 414(1–2): 131.
Lin J.P., Xu X.J., Wang Y.L., He, S.F, Zhang, Y., Song, X.P., and Chen, G.L., High temperature deformation behaviors of a high Nb containing TiAl alloy, Intermetallics, 2007, 15(5–6): 668.
Yamaguchi M. and Inui H., TiAl compounds for structural applications, [in] Proceedings of the First International Symposium on Structural Intermetallics, Warrendale, 1993: 127.
Kim Y.W. and Boyer R.R., Microstructure/property relationships in titanium aluminides and alloys, [in] Proceedings of the Symposium on Microstructure/Property Relationships in Titanium Aluminides and Alloys Presented at the 1990 TMS Fall Meeting, Detroit, 1990: 674.
Johnson D.R, Masuda Y., Inui H., and Yamaguchi M., Alignment of the TiAl/Ti3Al lamellar microstructure in TiAl alloys by growth from a seed material, Acta Mater., 1997, 45(6): 2523.
Liu Y., Wang D., Chen D., Lin D.L., Chen S.P., and Liu Z.G., Microtwinning deformation in PST TiAl crystal, Acta Metall. Sin., 1995, 9(31): 393.
Su J.L. and Hu G.K., Micromechanical model for γ-TiAl base PST crystals, Acta Metall. Sin. Eng. Lett., 2005, 18(6): 686.
Asai T., Hirata S., Takeyama M., and Matsuo T., Microstructure in Ti-48at.%Al PST crystal subjected to creep deformation, Mater. Sci. Eng. A, 2002, 329–331: 828.
Jung I.S., Jang H.S., Oh M.H., Lee J.H., and Wee D.M., Microstructure control of TiAl alloys containing β stabilizers by directional solidification, Mater. Sci. Eng. A, 2002, 329–331:13.
Johnson D.R., Inui H., Muto S., Omiya Y., and Yamanaka T., Microstructural development during directional solidification of α-seeded TiAl alloys, Acta Mater., 2006, 54(4): 1077.
Lee H.N., Johnson D.R., Inui H., Oh, M.H., Wee D.M., and Yamaguchi M., Microstructural control through seeding and directional solidification of TiAl alloys containing Mo and C, Acta Mater., 2000, 48(12): 3221.
Kim J.H., Kim S.W., Lee H.N., Oh M.H., Inui H., and Wee D.M., Effects of Si and C additions on the thermal stability of directionally solidified TiAl-Nb alloys, Intermetallics, 2005, 13(10): 1038.
Kim M.C., Oh M.H., Lee J.H., Inui H., Yamaguchi M., and Wee D.M., Composition and growth rate effects in directionally solidified TiAl alloys, Mater. Sci. Eng. A, 1997, 239–240: 570.
Johnson D.R., Masuda Y., Shimada Y., Inui H., and Yamaguchi, M., Directional solidification of TiAl-based alloys, [in] Proceedings of 2nd International Symposium on Structural Intermetallics, Champion, 1996: 287.
Blackburn M., Science, Technology and Application of Titanium, Edtited by Jaffee R.T. and Promisel N.E., Pergmon Press, London, 1970: 633.
Kim S.W., Wang P., Oh M.H., Wee D.M., and Kumar K.S., Mechanical properties of Si- and C-doped directionally solidified TiAl-Nb alloys, Intermetallics, 2004, 12(5): 499.
Takeyama M., Ohmura Y., Kikuchi M., and Matsuo T., Phase equilibria and microstructural control of gamma TiAl based alloys, Intermetallics, 1998, 6(7–8): 643.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Ding, X., Lin, J., He, J. et al. Directional solidification of Ti-45Al-8Nb-(W,B,Y) alloy. Rare Metals 29, 292–297 (2010). https://doi.org/10.1007/s12598-010-0051-1
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12598-010-0051-1