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Cold-Rolling and Subsequent Annealing of Ti-Rich Tial Polysynthetically Twinned (PST) Crystals

  • M.H. Oh (a1), H. Inui (a1), S.R. Nishitani (a1) and M. Yamaguchi (a1)

Abstract

Polysynthetically twinned (PST) crystals of Ti-rich TiAl have been grown and specimens cut from these crystals have been rolled at room temperature and subsequently annealed at 900°C and 1000°C. When the shear deformation parallel to the lamellar boundaries occurs during rolling, PST crystals of Ti-rich TiAl can be rolled to about 50% reduction in thickness at room temperature.

The recovery in microhardness occurs in two stages; the first stage associated with the decrease in dislocation density and the second stage connected with the annealing-out of deformation induced twins. The recrystallization mode depends on the amount of reduction. Up to 20% reduction, the lamellar structure is preserved even after the full recovery in hardness. When the amount of reduction exceeds 40%, a structure composed of equiaxed grains of TiAl is obtained after recrystallization. A mechanism of recrystallization of cold-rolled PST crystals, which may explain the dependence of recrystallization mode on the amount of reduction, is proposed.

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1. Fujiwara, T., Nakamura, A., Hosomi, H., Nishitani, S.R., Shirai, Y. and Yamaguchi, M., Phil. Mag. A, 61, 591 (1990).
2. Nishitani, S.R., Oh, M.H., Nakamura, A., Fujiwara, T. and Yamaguchi, H., J. Mater. Res., 5, 484 (1990).
3. Yamaguchi, M., Nishitani, S.R. and Shirai, Y., High Temperature Aluminides and Intermetallics Edited by Whang, S.H., Liu, C.T., Pope, D.P. and Stiegler, J.O., THS, 1990, p.63.
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Cold-Rolling and Subsequent Annealing of Ti-Rich Tial Polysynthetically Twinned (PST) Crystals

  • M.H. Oh (a1), H. Inui (a1), S.R. Nishitani (a1) and M. Yamaguchi (a1)

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