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Cold-rolling of Ti-rich TiAl polysynthetically twinned crystals

  • S. R. Nishitani (a1), M. H. Oh (a1), A. Nakamura (a1), T. Fujiwara (a1) and M. Yamaguchi (a1)...

Abstract

Polysynthetically twinned crystals of TiAl with a nearly stoichiometric composition have been grown and rolled at room temperature. The maximum total reduction in thickness which is attainable without fracture depends on lamellae orientation with respect to the rolling plane and rolling direction. When specimens are oriented such that shear deformation parallel to the lamellar planes is operative during rolling and its operation causes lengthening of specimens, such specimens can be rolled up to about 50% reduction in thickness. The (111) pole figures are determined for the surface of specimens rolled to several different amounts of reduction, and the formation of surface texture is briefly discussed.

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1Huang, S.C., Hall, E.L., and Gigliotti, M.F.X., Proc. of the MRS Symp. on High-Temperature Ordered Intermetallic Alloys II, edited by Stoloff, N.S., Koch, C.C., Liu, C.T., and Izumi, O. (Materials Research Society, Pittsburgh, PA, 1987), Vol. 81, p. 481.
2Hall, E. L. and Huang, S. C., J Mater. Res. 4, 595 (1989).
3Fujiwara, T., Nakamura, A., Hosomi, M., Nishitani, S. R., Shirai, Y., and Yamaguchi, M., accepted for publication in Phil. Mag. in July 1989.
4Sastry, .M. L. and Lipsitt, H. A., Metall. Trans. A 8A, 299 (1977)

Cold-rolling of Ti-rich TiAl polysynthetically twinned crystals

  • S. R. Nishitani (a1), M. H. Oh (a1), A. Nakamura (a1), T. Fujiwara (a1) and M. Yamaguchi (a1)...

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