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

Published online by Cambridge University Press:  26 February 2011

M.H. Oh ,
H. Inui ,
S.R. Nishitani  and
M. Yamaguchi
M.H. Oh
Affiliation:
Kyoto University, Department of Metal Science and Technology, Sakyo-ku, Kyoto 606, Japan
H. Inui
Affiliation:
Kyoto University, Department of Metal Science and Technology, Sakyo-ku, Kyoto 606, Japan
S.R. Nishitani
Affiliation:
Kyoto University, Department of Metal Science and Technology, Sakyo-ku, Kyoto 606, Japan
M. Yamaguchi
Affiliation:
Kyoto University, Department of Metal Science and Technology, Sakyo-ku, Kyoto 606, Japan
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 871
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

1. Fujiwara, T., Nakamura, A., Hosomi, H., Nishitani, S.R., Shirai, Y. and Yamaguchi, M., Phil. Mag. A, 61, 591 (1990).Google Scholar
2. Nishitani, S.R., Oh, M.H., Nakamura, A., Fujiwara, T. and Yamaguchi, H., J. Mater. Res., 5, 484 (1990).Google Scholar
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.Google Scholar
4. Feng, C.R., Michel, D.J. and Crowe, C.R., Scripta Netall., 22, 1481 (1988) ;Google Scholar
4a. 23, 241, 1135 (1989).Google Scholar
5. Inui, H., Nakamura, A. and Yamaguchi, M., High Temperature Ordered Intermetallic Alloys IV, (Mater. Res. Soc. Proc., this volume, Pittsburgh, PA).Google Scholar
6. Hall, E.L. and Huang, S.C., J. Mater. Res., 4, 595 (1989).Google Scholar