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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

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